Mercurial > hg > truffle
annotate src/share/vm/opto/divnode.cpp @ 337:9ee9cf798b59 jdk7-b37
6754988: Update copyright year
Summary: Update for files that have been modified starting July 2008
Reviewed-by: ohair, tbell
| author | xdono |
|---|---|
| date | Thu, 02 Oct 2008 19:58:19 -0700 |
| parents | ab075d07f1ba |
| children | cc80376deb0c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // Portions of code courtesy of Clifford Click | |
| 26 | |
| 27 // Optimization - Graph Style | |
| 28 | |
| 29 #include "incls/_precompiled.incl" | |
| 30 #include "incls/_divnode.cpp.incl" | |
| 31 #include <math.h> | |
| 32 | |
| 145 | 33 //----------------------magic_int_divide_constants----------------------------- |
| 34 // Compute magic multiplier and shift constant for converting a 32 bit divide | |
| 35 // by constant into a multiply/shift/add series. Return false if calculations | |
| 36 // fail. | |
| 37 // | |
| 38 // Borrowed almost verbatum from Hacker's Delight by Henry S. Warren, Jr. with | |
| 39 // minor type name and parameter changes. | |
| 40 static bool magic_int_divide_constants(jint d, jint &M, jint &s) { | |
| 41 int32_t p; | |
| 42 uint32_t ad, anc, delta, q1, r1, q2, r2, t; | |
| 43 const uint32_t two31 = 0x80000000L; // 2**31. | |
| 44 | |
| 45 ad = ABS(d); | |
| 46 if (d == 0 || d == 1) return false; | |
| 47 t = two31 + ((uint32_t)d >> 31); | |
| 48 anc = t - 1 - t%ad; // Absolute value of nc. | |
| 49 p = 31; // Init. p. | |
| 50 q1 = two31/anc; // Init. q1 = 2**p/|nc|. | |
| 51 r1 = two31 - q1*anc; // Init. r1 = rem(2**p, |nc|). | |
| 52 q2 = two31/ad; // Init. q2 = 2**p/|d|. | |
| 53 r2 = two31 - q2*ad; // Init. r2 = rem(2**p, |d|). | |
| 54 do { | |
| 55 p = p + 1; | |
| 56 q1 = 2*q1; // Update q1 = 2**p/|nc|. | |
| 57 r1 = 2*r1; // Update r1 = rem(2**p, |nc|). | |
| 58 if (r1 >= anc) { // (Must be an unsigned | |
| 59 q1 = q1 + 1; // comparison here). | |
| 60 r1 = r1 - anc; | |
| 61 } | |
| 62 q2 = 2*q2; // Update q2 = 2**p/|d|. | |
| 63 r2 = 2*r2; // Update r2 = rem(2**p, |d|). | |
| 64 if (r2 >= ad) { // (Must be an unsigned | |
| 65 q2 = q2 + 1; // comparison here). | |
| 66 r2 = r2 - ad; | |
| 67 } | |
| 68 delta = ad - r2; | |
| 69 } while (q1 < delta || (q1 == delta && r1 == 0)); | |
| 70 | |
| 71 M = q2 + 1; | |
| 72 if (d < 0) M = -M; // Magic number and | |
| 73 s = p - 32; // shift amount to return. | |
| 74 | |
| 75 return true; | |
| 76 } | |
| 77 | |
| 78 //--------------------------transform_int_divide------------------------------- | |
| 79 // Convert a division by constant divisor into an alternate Ideal graph. | |
| 80 // Return NULL if no transformation occurs. | |
| 81 static Node *transform_int_divide( PhaseGVN *phase, Node *dividend, jint divisor ) { | |
| 0 | 82 |
| 83 // Check for invalid divisors | |
| 145 | 84 assert( divisor != 0 && divisor != min_jint, |
| 85 "bad divisor for transforming to long multiply" ); | |
| 0 | 86 |
| 145 | 87 bool d_pos = divisor >= 0; |
| 88 jint d = d_pos ? divisor : -divisor; | |
| 89 const int N = 32; | |
| 0 | 90 |
| 91 // Result | |
| 145 | 92 Node *q = NULL; |
| 0 | 93 |
| 94 if (d == 1) { | |
| 145 | 95 // division by +/- 1 |
| 96 if (!d_pos) { | |
| 97 // Just negate the value | |
| 0 | 98 q = new (phase->C, 3) SubINode(phase->intcon(0), dividend); |
| 99 } | |
| 145 | 100 } else if ( is_power_of_2(d) ) { |
| 101 // division by +/- a power of 2 | |
| 0 | 102 |
| 103 // See if we can simply do a shift without rounding | |
| 104 bool needs_rounding = true; | |
| 105 const Type *dt = phase->type(dividend); | |
| 106 const TypeInt *dti = dt->isa_int(); | |
| 145 | 107 if (dti && dti->_lo >= 0) { |
| 108 // we don't need to round a positive dividend | |
| 0 | 109 needs_rounding = false; |
| 145 | 110 } else if( dividend->Opcode() == Op_AndI ) { |
| 111 // An AND mask of sufficient size clears the low bits and | |
| 112 // I can avoid rounding. | |
| 0 | 113 const TypeInt *andconi = phase->type( dividend->in(2) )->isa_int(); |
| 114 if( andconi && andconi->is_con(-d) ) { | |
| 115 dividend = dividend->in(1); | |
| 116 needs_rounding = false; | |
| 117 } | |
| 118 } | |
| 119 | |
| 120 // Add rounding to the shift to handle the sign bit | |
| 145 | 121 int l = log2_intptr(d-1)+1; |
| 122 if (needs_rounding) { | |
| 123 // Divide-by-power-of-2 can be made into a shift, but you have to do | |
| 124 // more math for the rounding. You need to add 0 for positive | |
| 125 // numbers, and "i-1" for negative numbers. Example: i=4, so the | |
| 126 // shift is by 2. You need to add 3 to negative dividends and 0 to | |
| 127 // positive ones. So (-7+3)>>2 becomes -1, (-4+3)>>2 becomes -1, | |
| 128 // (-2+3)>>2 becomes 0, etc. | |
| 129 | |
| 130 // Compute 0 or -1, based on sign bit | |
| 131 Node *sign = phase->transform(new (phase->C, 3) RShiftINode(dividend, phase->intcon(N - 1))); | |
| 132 // Mask sign bit to the low sign bits | |
| 133 Node *round = phase->transform(new (phase->C, 3) URShiftINode(sign, phase->intcon(N - l))); | |
| 134 // Round up before shifting | |
| 135 dividend = phase->transform(new (phase->C, 3) AddINode(dividend, round)); | |
| 0 | 136 } |
| 137 | |
| 145 | 138 // Shift for division |
| 0 | 139 q = new (phase->C, 3) RShiftINode(dividend, phase->intcon(l)); |
| 140 | |
| 145 | 141 if (!d_pos) { |
| 0 | 142 q = new (phase->C, 3) SubINode(phase->intcon(0), phase->transform(q)); |
| 145 | 143 } |
| 144 } else { | |
| 145 // Attempt the jint constant divide -> multiply transform found in | |
| 146 // "Division by Invariant Integers using Multiplication" | |
| 147 // by Granlund and Montgomery | |
| 148 // See also "Hacker's Delight", chapter 10 by Warren. | |
| 149 | |
| 150 jint magic_const; | |
| 151 jint shift_const; | |
| 152 if (magic_int_divide_constants(d, magic_const, shift_const)) { | |
| 153 Node *magic = phase->longcon(magic_const); | |
| 154 Node *dividend_long = phase->transform(new (phase->C, 2) ConvI2LNode(dividend)); | |
| 155 | |
| 156 // Compute the high half of the dividend x magic multiplication | |
| 157 Node *mul_hi = phase->transform(new (phase->C, 3) MulLNode(dividend_long, magic)); | |
| 158 | |
| 159 if (magic_const < 0) { | |
| 160 mul_hi = phase->transform(new (phase->C, 3) RShiftLNode(mul_hi, phase->intcon(N))); | |
| 161 mul_hi = phase->transform(new (phase->C, 2) ConvL2INode(mul_hi)); | |
| 162 | |
| 163 // The magic multiplier is too large for a 32 bit constant. We've adjusted | |
| 164 // it down by 2^32, but have to add 1 dividend back in after the multiplication. | |
| 165 // This handles the "overflow" case described by Granlund and Montgomery. | |
| 166 mul_hi = phase->transform(new (phase->C, 3) AddINode(dividend, mul_hi)); | |
| 167 | |
| 168 // Shift over the (adjusted) mulhi | |
| 169 if (shift_const != 0) { | |
| 170 mul_hi = phase->transform(new (phase->C, 3) RShiftINode(mul_hi, phase->intcon(shift_const))); | |
| 171 } | |
| 172 } else { | |
| 173 // No add is required, we can merge the shifts together. | |
| 174 mul_hi = phase->transform(new (phase->C, 3) RShiftLNode(mul_hi, phase->intcon(N + shift_const))); | |
| 175 mul_hi = phase->transform(new (phase->C, 2) ConvL2INode(mul_hi)); | |
| 176 } | |
| 177 | |
| 178 // Get a 0 or -1 from the sign of the dividend. | |
| 179 Node *addend0 = mul_hi; | |
| 180 Node *addend1 = phase->transform(new (phase->C, 3) RShiftINode(dividend, phase->intcon(N-1))); | |
| 181 | |
| 182 // If the divisor is negative, swap the order of the input addends; | |
| 183 // this has the effect of negating the quotient. | |
| 184 if (!d_pos) { | |
| 185 Node *temp = addend0; addend0 = addend1; addend1 = temp; | |
| 186 } | |
| 187 | |
| 188 // Adjust the final quotient by subtracting -1 (adding 1) | |
| 189 // from the mul_hi. | |
| 190 q = new (phase->C, 3) SubINode(addend0, addend1); | |
| 191 } | |
| 192 } | |
| 193 | |
| 194 return q; | |
| 195 } | |
| 196 | |
| 197 //---------------------magic_long_divide_constants----------------------------- | |
| 198 // Compute magic multiplier and shift constant for converting a 64 bit divide | |
| 199 // by constant into a multiply/shift/add series. Return false if calculations | |
| 200 // fail. | |
| 201 // | |
| 202 // Borrowed almost verbatum from Hacker's Delight by Henry S. Warren, Jr. with | |
| 203 // minor type name and parameter changes. Adjusted to 64 bit word width. | |
| 204 static bool magic_long_divide_constants(jlong d, jlong &M, jint &s) { | |
| 205 int64_t p; | |
| 206 uint64_t ad, anc, delta, q1, r1, q2, r2, t; | |
| 207 const uint64_t two63 = 0x8000000000000000LL; // 2**63. | |
| 208 | |
| 209 ad = ABS(d); | |
| 210 if (d == 0 || d == 1) return false; | |
| 211 t = two63 + ((uint64_t)d >> 63); | |
| 212 anc = t - 1 - t%ad; // Absolute value of nc. | |
| 213 p = 63; // Init. p. | |
| 214 q1 = two63/anc; // Init. q1 = 2**p/|nc|. | |
| 215 r1 = two63 - q1*anc; // Init. r1 = rem(2**p, |nc|). | |
| 216 q2 = two63/ad; // Init. q2 = 2**p/|d|. | |
| 217 r2 = two63 - q2*ad; // Init. r2 = rem(2**p, |d|). | |
| 218 do { | |
| 219 p = p + 1; | |
| 220 q1 = 2*q1; // Update q1 = 2**p/|nc|. | |
| 221 r1 = 2*r1; // Update r1 = rem(2**p, |nc|). | |
| 222 if (r1 >= anc) { // (Must be an unsigned | |
| 223 q1 = q1 + 1; // comparison here). | |
| 224 r1 = r1 - anc; | |
| 225 } | |
| 226 q2 = 2*q2; // Update q2 = 2**p/|d|. | |
| 227 r2 = 2*r2; // Update r2 = rem(2**p, |d|). | |
| 228 if (r2 >= ad) { // (Must be an unsigned | |
| 229 q2 = q2 + 1; // comparison here). | |
| 230 r2 = r2 - ad; | |
| 231 } | |
| 232 delta = ad - r2; | |
| 233 } while (q1 < delta || (q1 == delta && r1 == 0)); | |
| 234 | |
| 235 M = q2 + 1; | |
| 236 if (d < 0) M = -M; // Magic number and | |
| 237 s = p - 64; // shift amount to return. | |
| 238 | |
| 239 return true; | |
| 240 } | |
| 241 | |
| 242 //---------------------long_by_long_mulhi-------------------------------------- | |
| 243 // Generate ideal node graph for upper half of a 64 bit x 64 bit multiplication | |
| 244 static Node *long_by_long_mulhi( PhaseGVN *phase, Node *dividend, jlong magic_const) { | |
| 245 // If the architecture supports a 64x64 mulhi, there is | |
| 246 // no need to synthesize it in ideal nodes. | |
| 247 if (Matcher::has_match_rule(Op_MulHiL)) { | |
| 248 Node *v = phase->longcon(magic_const); | |
| 249 return new (phase->C, 3) MulHiLNode(dividend, v); | |
| 0 | 250 } |
| 251 | |
| 145 | 252 const int N = 64; |
| 253 | |
| 254 Node *u_hi = phase->transform(new (phase->C, 3) RShiftLNode(dividend, phase->intcon(N / 2))); | |
| 255 Node *u_lo = phase->transform(new (phase->C, 3) AndLNode(dividend, phase->longcon(0xFFFFFFFF))); | |
| 256 | |
| 257 Node *v_hi = phase->longcon(magic_const >> N/2); | |
| 258 Node *v_lo = phase->longcon(magic_const & 0XFFFFFFFF); | |
| 259 | |
| 260 Node *hihi_product = phase->transform(new (phase->C, 3) MulLNode(u_hi, v_hi)); | |
| 261 Node *hilo_product = phase->transform(new (phase->C, 3) MulLNode(u_hi, v_lo)); | |
| 262 Node *lohi_product = phase->transform(new (phase->C, 3) MulLNode(u_lo, v_hi)); | |
| 263 Node *lolo_product = phase->transform(new (phase->C, 3) MulLNode(u_lo, v_lo)); | |
| 264 | |
| 265 Node *t1 = phase->transform(new (phase->C, 3) URShiftLNode(lolo_product, phase->intcon(N / 2))); | |
| 266 Node *t2 = phase->transform(new (phase->C, 3) AddLNode(hilo_product, t1)); | |
|
294
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267 |
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268 // Construct both t3 and t4 before transforming so t2 doesn't go dead |
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269 // prematurely. |
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270 Node *t3 = new (phase->C, 3) RShiftLNode(t2, phase->intcon(N / 2)); |
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271 Node *t4 = new (phase->C, 3) AndLNode(t2, phase->longcon(0xFFFFFFFF)); |
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272 t3 = phase->transform(t3); |
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273 t4 = phase->transform(t4); |
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274 |
| 145 | 275 Node *t5 = phase->transform(new (phase->C, 3) AddLNode(t4, lohi_product)); |
| 276 Node *t6 = phase->transform(new (phase->C, 3) RShiftLNode(t5, phase->intcon(N / 2))); | |
| 277 Node *t7 = phase->transform(new (phase->C, 3) AddLNode(t3, hihi_product)); | |
| 278 | |
| 279 return new (phase->C, 3) AddLNode(t7, t6); | |
| 280 } | |
| 281 | |
| 282 | |
| 283 //--------------------------transform_long_divide------------------------------ | |
| 284 // Convert a division by constant divisor into an alternate Ideal graph. | |
| 285 // Return NULL if no transformation occurs. | |
| 286 static Node *transform_long_divide( PhaseGVN *phase, Node *dividend, jlong divisor ) { | |
| 287 // Check for invalid divisors | |
| 288 assert( divisor != 0L && divisor != min_jlong, | |
| 289 "bad divisor for transforming to long multiply" ); | |
| 290 | |
| 291 bool d_pos = divisor >= 0; | |
| 292 jlong d = d_pos ? divisor : -divisor; | |
| 293 const int N = 64; | |
| 294 | |
| 295 // Result | |
| 296 Node *q = NULL; | |
| 297 | |
| 298 if (d == 1) { | |
| 299 // division by +/- 1 | |
| 300 if (!d_pos) { | |
| 301 // Just negate the value | |
| 302 q = new (phase->C, 3) SubLNode(phase->longcon(0), dividend); | |
| 303 } | |
| 304 } else if ( is_power_of_2_long(d) ) { | |
| 305 | |
| 306 // division by +/- a power of 2 | |
| 307 | |
| 308 // See if we can simply do a shift without rounding | |
| 309 bool needs_rounding = true; | |
| 310 const Type *dt = phase->type(dividend); | |
| 311 const TypeLong *dtl = dt->isa_long(); | |
| 0 | 312 |
| 145 | 313 if (dtl && dtl->_lo > 0) { |
| 314 // we don't need to round a positive dividend | |
| 315 needs_rounding = false; | |
| 316 } else if( dividend->Opcode() == Op_AndL ) { | |
| 317 // An AND mask of sufficient size clears the low bits and | |
| 318 // I can avoid rounding. | |
| 319 const TypeLong *andconl = phase->type( dividend->in(2) )->isa_long(); | |
| 320 if( andconl && andconl->is_con(-d)) { | |
| 321 dividend = dividend->in(1); | |
| 322 needs_rounding = false; | |
| 323 } | |
| 324 } | |
| 325 | |
| 326 // Add rounding to the shift to handle the sign bit | |
| 327 int l = log2_long(d-1)+1; | |
| 328 if (needs_rounding) { | |
| 329 // Divide-by-power-of-2 can be made into a shift, but you have to do | |
| 330 // more math for the rounding. You need to add 0 for positive | |
| 331 // numbers, and "i-1" for negative numbers. Example: i=4, so the | |
| 332 // shift is by 2. You need to add 3 to negative dividends and 0 to | |
| 333 // positive ones. So (-7+3)>>2 becomes -1, (-4+3)>>2 becomes -1, | |
| 334 // (-2+3)>>2 becomes 0, etc. | |
| 335 | |
| 336 // Compute 0 or -1, based on sign bit | |
| 337 Node *sign = phase->transform(new (phase->C, 3) RShiftLNode(dividend, phase->intcon(N - 1))); | |
| 338 // Mask sign bit to the low sign bits | |
| 339 Node *round = phase->transform(new (phase->C, 3) URShiftLNode(sign, phase->intcon(N - l))); | |
| 340 // Round up before shifting | |
| 341 dividend = phase->transform(new (phase->C, 3) AddLNode(dividend, round)); | |
| 342 } | |
| 343 | |
| 344 // Shift for division | |
| 345 q = new (phase->C, 3) RShiftLNode(dividend, phase->intcon(l)); | |
| 346 | |
| 347 if (!d_pos) { | |
| 348 q = new (phase->C, 3) SubLNode(phase->longcon(0), phase->transform(q)); | |
| 349 } | |
| 350 } else { | |
| 351 // Attempt the jlong constant divide -> multiply transform found in | |
| 352 // "Division by Invariant Integers using Multiplication" | |
| 353 // by Granlund and Montgomery | |
| 354 // See also "Hacker's Delight", chapter 10 by Warren. | |
| 355 | |
| 356 jlong magic_const; | |
| 357 jint shift_const; | |
| 358 if (magic_long_divide_constants(d, magic_const, shift_const)) { | |
| 359 // Compute the high half of the dividend x magic multiplication | |
| 360 Node *mul_hi = phase->transform(long_by_long_mulhi(phase, dividend, magic_const)); | |
| 361 | |
| 362 // The high half of the 128-bit multiply is computed. | |
| 363 if (magic_const < 0) { | |
| 364 // The magic multiplier is too large for a 64 bit constant. We've adjusted | |
| 365 // it down by 2^64, but have to add 1 dividend back in after the multiplication. | |
| 366 // This handles the "overflow" case described by Granlund and Montgomery. | |
| 367 mul_hi = phase->transform(new (phase->C, 3) AddLNode(dividend, mul_hi)); | |
| 368 } | |
| 369 | |
| 370 // Shift over the (adjusted) mulhi | |
| 371 if (shift_const != 0) { | |
| 372 mul_hi = phase->transform(new (phase->C, 3) RShiftLNode(mul_hi, phase->intcon(shift_const))); | |
| 373 } | |
| 374 | |
| 375 // Get a 0 or -1 from the sign of the dividend. | |
| 376 Node *addend0 = mul_hi; | |
| 377 Node *addend1 = phase->transform(new (phase->C, 3) RShiftLNode(dividend, phase->intcon(N-1))); | |
| 378 | |
| 379 // If the divisor is negative, swap the order of the input addends; | |
| 380 // this has the effect of negating the quotient. | |
| 381 if (!d_pos) { | |
| 382 Node *temp = addend0; addend0 = addend1; addend1 = temp; | |
| 383 } | |
| 384 | |
| 385 // Adjust the final quotient by subtracting -1 (adding 1) | |
| 386 // from the mul_hi. | |
| 387 q = new (phase->C, 3) SubLNode(addend0, addend1); | |
| 388 } | |
| 0 | 389 } |
| 390 | |
| 145 | 391 return q; |
| 0 | 392 } |
| 393 | |
| 394 //============================================================================= | |
| 395 //------------------------------Identity--------------------------------------- | |
| 396 // If the divisor is 1, we are an identity on the dividend. | |
| 397 Node *DivINode::Identity( PhaseTransform *phase ) { | |
| 398 return (phase->type( in(2) )->higher_equal(TypeInt::ONE)) ? in(1) : this; | |
| 399 } | |
| 400 | |
| 401 //------------------------------Idealize--------------------------------------- | |
| 402 // Divides can be changed to multiplies and/or shifts | |
| 403 Node *DivINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 404 if (in(0) && remove_dead_region(phase, can_reshape)) return this; | |
| 305 | 405 // Don't bother trying to transform a dead node |
| 406 if( in(0) && in(0)->is_top() ) return NULL; | |
| 0 | 407 |
| 408 const Type *t = phase->type( in(2) ); | |
| 409 if( t == TypeInt::ONE ) // Identity? | |
| 410 return NULL; // Skip it | |
| 411 | |
| 412 const TypeInt *ti = t->isa_int(); | |
| 413 if( !ti ) return NULL; | |
| 414 if( !ti->is_con() ) return NULL; | |
| 145 | 415 jint i = ti->get_con(); // Get divisor |
| 0 | 416 |
| 417 if (i == 0) return NULL; // Dividing by zero constant does not idealize | |
| 418 | |
| 419 set_req(0,NULL); // Dividing by a not-zero constant; no faulting | |
| 420 | |
| 421 // Dividing by MININT does not optimize as a power-of-2 shift. | |
| 422 if( i == min_jint ) return NULL; | |
| 423 | |
| 145 | 424 return transform_int_divide( phase, in(1), i ); |
| 0 | 425 } |
| 426 | |
| 427 //------------------------------Value------------------------------------------ | |
| 428 // A DivINode divides its inputs. The third input is a Control input, used to | |
| 429 // prevent hoisting the divide above an unsafe test. | |
| 430 const Type *DivINode::Value( PhaseTransform *phase ) const { | |
| 431 // Either input is TOP ==> the result is TOP | |
| 432 const Type *t1 = phase->type( in(1) ); | |
| 433 const Type *t2 = phase->type( in(2) ); | |
| 434 if( t1 == Type::TOP ) return Type::TOP; | |
| 435 if( t2 == Type::TOP ) return Type::TOP; | |
| 436 | |
| 437 // x/x == 1 since we always generate the dynamic divisor check for 0. | |
| 438 if( phase->eqv( in(1), in(2) ) ) | |
| 439 return TypeInt::ONE; | |
| 440 | |
| 441 // Either input is BOTTOM ==> the result is the local BOTTOM | |
| 442 const Type *bot = bottom_type(); | |
| 443 if( (t1 == bot) || (t2 == bot) || | |
| 444 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
| 445 return bot; | |
| 446 | |
| 447 // Divide the two numbers. We approximate. | |
| 448 // If divisor is a constant and not zero | |
| 449 const TypeInt *i1 = t1->is_int(); | |
| 450 const TypeInt *i2 = t2->is_int(); | |
| 451 int widen = MAX2(i1->_widen, i2->_widen); | |
| 452 | |
| 453 if( i2->is_con() && i2->get_con() != 0 ) { | |
| 454 int32 d = i2->get_con(); // Divisor | |
| 455 jint lo, hi; | |
| 456 if( d >= 0 ) { | |
| 457 lo = i1->_lo/d; | |
| 458 hi = i1->_hi/d; | |
| 459 } else { | |
| 460 if( d == -1 && i1->_lo == min_jint ) { | |
| 461 // 'min_jint/-1' throws arithmetic exception during compilation | |
| 462 lo = min_jint; | |
| 463 // do not support holes, 'hi' must go to either min_jint or max_jint: | |
| 464 // [min_jint, -10]/[-1,-1] ==> [min_jint] UNION [10,max_jint] | |
| 465 hi = i1->_hi == min_jint ? min_jint : max_jint; | |
| 466 } else { | |
| 467 lo = i1->_hi/d; | |
| 468 hi = i1->_lo/d; | |
| 469 } | |
| 470 } | |
| 471 return TypeInt::make(lo, hi, widen); | |
| 472 } | |
| 473 | |
| 474 // If the dividend is a constant | |
| 475 if( i1->is_con() ) { | |
| 476 int32 d = i1->get_con(); | |
| 477 if( d < 0 ) { | |
| 478 if( d == min_jint ) { | |
| 479 // (-min_jint) == min_jint == (min_jint / -1) | |
| 480 return TypeInt::make(min_jint, max_jint/2 + 1, widen); | |
| 481 } else { | |
| 482 return TypeInt::make(d, -d, widen); | |
| 483 } | |
| 484 } | |
| 485 return TypeInt::make(-d, d, widen); | |
| 486 } | |
| 487 | |
| 488 // Otherwise we give up all hope | |
| 489 return TypeInt::INT; | |
| 490 } | |
| 491 | |
| 492 | |
| 493 //============================================================================= | |
| 494 //------------------------------Identity--------------------------------------- | |
| 495 // If the divisor is 1, we are an identity on the dividend. | |
| 496 Node *DivLNode::Identity( PhaseTransform *phase ) { | |
| 497 return (phase->type( in(2) )->higher_equal(TypeLong::ONE)) ? in(1) : this; | |
| 498 } | |
| 499 | |
| 500 //------------------------------Idealize--------------------------------------- | |
| 501 // Dividing by a power of 2 is a shift. | |
| 502 Node *DivLNode::Ideal( PhaseGVN *phase, bool can_reshape) { | |
| 503 if (in(0) && remove_dead_region(phase, can_reshape)) return this; | |
| 305 | 504 // Don't bother trying to transform a dead node |
| 505 if( in(0) && in(0)->is_top() ) return NULL; | |
| 0 | 506 |
| 507 const Type *t = phase->type( in(2) ); | |
| 145 | 508 if( t == TypeLong::ONE ) // Identity? |
| 0 | 509 return NULL; // Skip it |
| 510 | |
| 145 | 511 const TypeLong *tl = t->isa_long(); |
| 512 if( !tl ) return NULL; | |
| 513 if( !tl->is_con() ) return NULL; | |
| 514 jlong l = tl->get_con(); // Get divisor | |
| 515 | |
| 516 if (l == 0) return NULL; // Dividing by zero constant does not idealize | |
| 517 | |
| 518 set_req(0,NULL); // Dividing by a not-zero constant; no faulting | |
| 0 | 519 |
| 520 // Dividing by MININT does not optimize as a power-of-2 shift. | |
| 145 | 521 if( l == min_jlong ) return NULL; |
| 0 | 522 |
| 145 | 523 return transform_long_divide( phase, in(1), l ); |
| 0 | 524 } |
| 525 | |
| 526 //------------------------------Value------------------------------------------ | |
| 527 // A DivLNode divides its inputs. The third input is a Control input, used to | |
| 528 // prevent hoisting the divide above an unsafe test. | |
| 529 const Type *DivLNode::Value( PhaseTransform *phase ) const { | |
| 530 // Either input is TOP ==> the result is TOP | |
| 531 const Type *t1 = phase->type( in(1) ); | |
| 532 const Type *t2 = phase->type( in(2) ); | |
| 533 if( t1 == Type::TOP ) return Type::TOP; | |
| 534 if( t2 == Type::TOP ) return Type::TOP; | |
| 535 | |
| 536 // x/x == 1 since we always generate the dynamic divisor check for 0. | |
| 537 if( phase->eqv( in(1), in(2) ) ) | |
| 538 return TypeLong::ONE; | |
| 539 | |
| 540 // Either input is BOTTOM ==> the result is the local BOTTOM | |
| 541 const Type *bot = bottom_type(); | |
| 542 if( (t1 == bot) || (t2 == bot) || | |
| 543 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
| 544 return bot; | |
| 545 | |
| 546 // Divide the two numbers. We approximate. | |
| 547 // If divisor is a constant and not zero | |
| 548 const TypeLong *i1 = t1->is_long(); | |
| 549 const TypeLong *i2 = t2->is_long(); | |
| 550 int widen = MAX2(i1->_widen, i2->_widen); | |
| 551 | |
| 552 if( i2->is_con() && i2->get_con() != 0 ) { | |
| 553 jlong d = i2->get_con(); // Divisor | |
| 554 jlong lo, hi; | |
| 555 if( d >= 0 ) { | |
| 556 lo = i1->_lo/d; | |
| 557 hi = i1->_hi/d; | |
| 558 } else { | |
| 559 if( d == CONST64(-1) && i1->_lo == min_jlong ) { | |
| 560 // 'min_jlong/-1' throws arithmetic exception during compilation | |
| 561 lo = min_jlong; | |
| 562 // do not support holes, 'hi' must go to either min_jlong or max_jlong: | |
| 563 // [min_jlong, -10]/[-1,-1] ==> [min_jlong] UNION [10,max_jlong] | |
| 564 hi = i1->_hi == min_jlong ? min_jlong : max_jlong; | |
| 565 } else { | |
| 566 lo = i1->_hi/d; | |
| 567 hi = i1->_lo/d; | |
| 568 } | |
| 569 } | |
| 570 return TypeLong::make(lo, hi, widen); | |
| 571 } | |
| 572 | |
| 573 // If the dividend is a constant | |
| 574 if( i1->is_con() ) { | |
| 575 jlong d = i1->get_con(); | |
| 576 if( d < 0 ) { | |
| 577 if( d == min_jlong ) { | |
| 578 // (-min_jlong) == min_jlong == (min_jlong / -1) | |
| 579 return TypeLong::make(min_jlong, max_jlong/2 + 1, widen); | |
| 580 } else { | |
| 581 return TypeLong::make(d, -d, widen); | |
| 582 } | |
| 583 } | |
| 584 return TypeLong::make(-d, d, widen); | |
| 585 } | |
| 586 | |
| 587 // Otherwise we give up all hope | |
| 588 return TypeLong::LONG; | |
| 589 } | |
| 590 | |
| 591 | |
| 592 //============================================================================= | |
| 593 //------------------------------Value------------------------------------------ | |
| 594 // An DivFNode divides its inputs. The third input is a Control input, used to | |
| 595 // prevent hoisting the divide above an unsafe test. | |
| 596 const Type *DivFNode::Value( PhaseTransform *phase ) const { | |
| 597 // Either input is TOP ==> the result is TOP | |
| 598 const Type *t1 = phase->type( in(1) ); | |
| 599 const Type *t2 = phase->type( in(2) ); | |
| 600 if( t1 == Type::TOP ) return Type::TOP; | |
| 601 if( t2 == Type::TOP ) return Type::TOP; | |
| 602 | |
| 603 // Either input is BOTTOM ==> the result is the local BOTTOM | |
| 604 const Type *bot = bottom_type(); | |
| 605 if( (t1 == bot) || (t2 == bot) || | |
| 606 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
| 607 return bot; | |
| 608 | |
| 609 // x/x == 1, we ignore 0/0. | |
| 610 // Note: if t1 and t2 are zero then result is NaN (JVMS page 213) | |
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611 // Does not work for variables because of NaN's |
| 0 | 612 if( phase->eqv( in(1), in(2) ) && t1->base() == Type::FloatCon) |
| 613 if (!g_isnan(t1->getf()) && g_isfinite(t1->getf()) && t1->getf() != 0.0) // could be negative ZERO or NaN | |
| 614 return TypeF::ONE; | |
| 615 | |
| 616 if( t2 == TypeF::ONE ) | |
| 617 return t1; | |
| 618 | |
| 619 // If divisor is a constant and not zero, divide them numbers | |
| 620 if( t1->base() == Type::FloatCon && | |
| 621 t2->base() == Type::FloatCon && | |
| 622 t2->getf() != 0.0 ) // could be negative zero | |
| 623 return TypeF::make( t1->getf()/t2->getf() ); | |
| 624 | |
| 625 // If the dividend is a constant zero | |
| 626 // Note: if t1 and t2 are zero then result is NaN (JVMS page 213) | |
| 627 // Test TypeF::ZERO is not sufficient as it could be negative zero | |
| 628 | |
| 629 if( t1 == TypeF::ZERO && !g_isnan(t2->getf()) && t2->getf() != 0.0 ) | |
| 630 return TypeF::ZERO; | |
| 631 | |
| 632 // Otherwise we give up all hope | |
| 633 return Type::FLOAT; | |
| 634 } | |
| 635 | |
| 636 //------------------------------isA_Copy--------------------------------------- | |
| 637 // Dividing by self is 1. | |
| 638 // If the divisor is 1, we are an identity on the dividend. | |
| 639 Node *DivFNode::Identity( PhaseTransform *phase ) { | |
| 640 return (phase->type( in(2) ) == TypeF::ONE) ? in(1) : this; | |
| 641 } | |
| 642 | |
| 643 | |
| 644 //------------------------------Idealize--------------------------------------- | |
| 645 Node *DivFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 646 if (in(0) && remove_dead_region(phase, can_reshape)) return this; | |
| 305 | 647 // Don't bother trying to transform a dead node |
| 648 if( in(0) && in(0)->is_top() ) return NULL; | |
| 0 | 649 |
| 650 const Type *t2 = phase->type( in(2) ); | |
| 651 if( t2 == TypeF::ONE ) // Identity? | |
| 652 return NULL; // Skip it | |
| 653 | |
| 654 const TypeF *tf = t2->isa_float_constant(); | |
| 655 if( !tf ) return NULL; | |
| 656 if( tf->base() != Type::FloatCon ) return NULL; | |
| 657 | |
| 658 // Check for out of range values | |
| 659 if( tf->is_nan() || !tf->is_finite() ) return NULL; | |
| 660 | |
| 661 // Get the value | |
| 662 float f = tf->getf(); | |
| 663 int exp; | |
| 664 | |
| 665 // Only for special case of dividing by a power of 2 | |
| 666 if( frexp((double)f, &exp) != 0.5 ) return NULL; | |
| 667 | |
| 668 // Limit the range of acceptable exponents | |
| 669 if( exp < -126 || exp > 126 ) return NULL; | |
| 670 | |
| 671 // Compute the reciprocal | |
| 672 float reciprocal = ((float)1.0) / f; | |
| 673 | |
| 674 assert( frexp((double)reciprocal, &exp) == 0.5, "reciprocal should be power of 2" ); | |
| 675 | |
| 676 // return multiplication by the reciprocal | |
| 677 return (new (phase->C, 3) MulFNode(in(1), phase->makecon(TypeF::make(reciprocal)))); | |
| 678 } | |
| 679 | |
| 680 //============================================================================= | |
| 681 //------------------------------Value------------------------------------------ | |
| 682 // An DivDNode divides its inputs. The third input is a Control input, used to | |
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683 // prevent hoisting the divide above an unsafe test. |
| 0 | 684 const Type *DivDNode::Value( PhaseTransform *phase ) const { |
| 685 // Either input is TOP ==> the result is TOP | |
| 686 const Type *t1 = phase->type( in(1) ); | |
| 687 const Type *t2 = phase->type( in(2) ); | |
| 688 if( t1 == Type::TOP ) return Type::TOP; | |
| 689 if( t2 == Type::TOP ) return Type::TOP; | |
| 690 | |
| 691 // Either input is BOTTOM ==> the result is the local BOTTOM | |
| 692 const Type *bot = bottom_type(); | |
| 693 if( (t1 == bot) || (t2 == bot) || | |
| 694 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
| 695 return bot; | |
| 696 | |
| 697 // x/x == 1, we ignore 0/0. | |
| 698 // Note: if t1 and t2 are zero then result is NaN (JVMS page 213) | |
| 699 // Does not work for variables because of NaN's | |
| 700 if( phase->eqv( in(1), in(2) ) && t1->base() == Type::DoubleCon) | |
| 701 if (!g_isnan(t1->getd()) && g_isfinite(t1->getd()) && t1->getd() != 0.0) // could be negative ZERO or NaN | |
| 702 return TypeD::ONE; | |
| 703 | |
| 704 if( t2 == TypeD::ONE ) | |
| 705 return t1; | |
| 706 | |
| 707 // If divisor is a constant and not zero, divide them numbers | |
| 708 if( t1->base() == Type::DoubleCon && | |
| 709 t2->base() == Type::DoubleCon && | |
| 710 t2->getd() != 0.0 ) // could be negative zero | |
| 711 return TypeD::make( t1->getd()/t2->getd() ); | |
| 712 | |
| 713 // If the dividend is a constant zero | |
| 714 // Note: if t1 and t2 are zero then result is NaN (JVMS page 213) | |
| 715 // Test TypeF::ZERO is not sufficient as it could be negative zero | |
| 716 if( t1 == TypeD::ZERO && !g_isnan(t2->getd()) && t2->getd() != 0.0 ) | |
| 717 return TypeD::ZERO; | |
| 718 | |
| 719 // Otherwise we give up all hope | |
| 720 return Type::DOUBLE; | |
| 721 } | |
| 722 | |
| 723 | |
| 724 //------------------------------isA_Copy--------------------------------------- | |
| 725 // Dividing by self is 1. | |
| 726 // If the divisor is 1, we are an identity on the dividend. | |
| 727 Node *DivDNode::Identity( PhaseTransform *phase ) { | |
| 728 return (phase->type( in(2) ) == TypeD::ONE) ? in(1) : this; | |
| 729 } | |
| 730 | |
| 731 //------------------------------Idealize--------------------------------------- | |
| 732 Node *DivDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 733 if (in(0) && remove_dead_region(phase, can_reshape)) return this; | |
| 305 | 734 // Don't bother trying to transform a dead node |
| 735 if( in(0) && in(0)->is_top() ) return NULL; | |
| 0 | 736 |
| 737 const Type *t2 = phase->type( in(2) ); | |
| 738 if( t2 == TypeD::ONE ) // Identity? | |
| 739 return NULL; // Skip it | |
| 740 | |
| 741 const TypeD *td = t2->isa_double_constant(); | |
| 742 if( !td ) return NULL; | |
| 743 if( td->base() != Type::DoubleCon ) return NULL; | |
| 744 | |
| 745 // Check for out of range values | |
| 746 if( td->is_nan() || !td->is_finite() ) return NULL; | |
| 747 | |
| 748 // Get the value | |
| 749 double d = td->getd(); | |
| 750 int exp; | |
| 751 | |
| 752 // Only for special case of dividing by a power of 2 | |
| 753 if( frexp(d, &exp) != 0.5 ) return NULL; | |
| 754 | |
| 755 // Limit the range of acceptable exponents | |
| 756 if( exp < -1021 || exp > 1022 ) return NULL; | |
| 757 | |
| 758 // Compute the reciprocal | |
| 759 double reciprocal = 1.0 / d; | |
| 760 | |
| 761 assert( frexp(reciprocal, &exp) == 0.5, "reciprocal should be power of 2" ); | |
| 762 | |
| 763 // return multiplication by the reciprocal | |
| 764 return (new (phase->C, 3) MulDNode(in(1), phase->makecon(TypeD::make(reciprocal)))); | |
| 765 } | |
| 766 | |
| 767 //============================================================================= | |
| 768 //------------------------------Idealize--------------------------------------- | |
| 769 Node *ModINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 770 // Check for dead control input | |
| 305 | 771 if( in(0) && remove_dead_region(phase, can_reshape) ) return this; |
| 772 // Don't bother trying to transform a dead node | |
| 773 if( in(0) && in(0)->is_top() ) return NULL; | |
| 0 | 774 |
| 775 // Get the modulus | |
| 776 const Type *t = phase->type( in(2) ); | |
| 777 if( t == Type::TOP ) return NULL; | |
| 778 const TypeInt *ti = t->is_int(); | |
| 779 | |
| 780 // Check for useless control input | |
| 781 // Check for excluding mod-zero case | |
| 782 if( in(0) && (ti->_hi < 0 || ti->_lo > 0) ) { | |
| 783 set_req(0, NULL); // Yank control input | |
| 784 return this; | |
| 785 } | |
| 786 | |
| 787 // See if we are MOD'ing by 2^k or 2^k-1. | |
| 788 if( !ti->is_con() ) return NULL; | |
| 789 jint con = ti->get_con(); | |
| 790 | |
| 791 Node *hook = new (phase->C, 1) Node(1); | |
| 792 | |
| 793 // First, special check for modulo 2^k-1 | |
| 794 if( con >= 0 && con < max_jint && is_power_of_2(con+1) ) { | |
| 795 uint k = exact_log2(con+1); // Extract k | |
| 796 | |
| 797 // Basic algorithm by David Detlefs. See fastmod_int.java for gory details. | |
| 798 static int unroll_factor[] = { 999, 999, 29, 14, 9, 7, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1 /*past here we assume 1 forever*/}; | |
| 799 int trip_count = 1; | |
| 800 if( k < ARRAY_SIZE(unroll_factor)) trip_count = unroll_factor[k]; | |
| 801 | |
| 802 // If the unroll factor is not too large, and if conditional moves are | |
| 803 // ok, then use this case | |
| 804 if( trip_count <= 5 && ConditionalMoveLimit != 0 ) { | |
| 805 Node *x = in(1); // Value being mod'd | |
| 806 Node *divisor = in(2); // Also is mask | |
| 807 | |
| 808 hook->init_req(0, x); // Add a use to x to prevent him from dying | |
| 809 // Generate code to reduce X rapidly to nearly 2^k-1. | |
| 810 for( int i = 0; i < trip_count; i++ ) { | |
| 145 | 811 Node *xl = phase->transform( new (phase->C, 3) AndINode(x,divisor) ); |
| 812 Node *xh = phase->transform( new (phase->C, 3) RShiftINode(x,phase->intcon(k)) ); // Must be signed | |
| 813 x = phase->transform( new (phase->C, 3) AddINode(xh,xl) ); | |
| 814 hook->set_req(0, x); | |
| 0 | 815 } |
| 816 | |
| 817 // Generate sign-fixup code. Was original value positive? | |
| 818 // int hack_res = (i >= 0) ? divisor : 1; | |
| 819 Node *cmp1 = phase->transform( new (phase->C, 3) CmpINode( in(1), phase->intcon(0) ) ); | |
| 820 Node *bol1 = phase->transform( new (phase->C, 2) BoolNode( cmp1, BoolTest::ge ) ); | |
| 821 Node *cmov1= phase->transform( new (phase->C, 4) CMoveINode(bol1, phase->intcon(1), divisor, TypeInt::POS) ); | |
| 822 // if( x >= hack_res ) x -= divisor; | |
| 823 Node *sub = phase->transform( new (phase->C, 3) SubINode( x, divisor ) ); | |
| 824 Node *cmp2 = phase->transform( new (phase->C, 3) CmpINode( x, cmov1 ) ); | |
| 825 Node *bol2 = phase->transform( new (phase->C, 2) BoolNode( cmp2, BoolTest::ge ) ); | |
| 826 // Convention is to not transform the return value of an Ideal | |
| 827 // since Ideal is expected to return a modified 'this' or a new node. | |
| 828 Node *cmov2= new (phase->C, 4) CMoveINode(bol2, x, sub, TypeInt::INT); | |
| 829 // cmov2 is now the mod | |
| 830 | |
| 831 // Now remove the bogus extra edges used to keep things alive | |
| 832 if (can_reshape) { | |
| 833 phase->is_IterGVN()->remove_dead_node(hook); | |
| 834 } else { | |
| 835 hook->set_req(0, NULL); // Just yank bogus edge during Parse phase | |
| 836 } | |
| 837 return cmov2; | |
| 838 } | |
| 839 } | |
| 840 | |
| 841 // Fell thru, the unroll case is not appropriate. Transform the modulo | |
| 842 // into a long multiply/int multiply/subtract case | |
| 843 | |
| 844 // Cannot handle mod 0, and min_jint isn't handled by the transform | |
| 845 if( con == 0 || con == min_jint ) return NULL; | |
| 846 | |
| 847 // Get the absolute value of the constant; at this point, we can use this | |
| 848 jint pos_con = (con >= 0) ? con : -con; | |
| 849 | |
| 850 // integer Mod 1 is always 0 | |
| 851 if( pos_con == 1 ) return new (phase->C, 1) ConINode(TypeInt::ZERO); | |
| 852 | |
| 853 int log2_con = -1; | |
| 854 | |
| 855 // If this is a power of two, they maybe we can mask it | |
| 856 if( is_power_of_2(pos_con) ) { | |
| 857 log2_con = log2_intptr((intptr_t)pos_con); | |
| 858 | |
| 859 const Type *dt = phase->type(in(1)); | |
| 860 const TypeInt *dti = dt->isa_int(); | |
| 861 | |
| 862 // See if this can be masked, if the dividend is non-negative | |
| 863 if( dti && dti->_lo >= 0 ) | |
| 864 return ( new (phase->C, 3) AndINode( in(1), phase->intcon( pos_con-1 ) ) ); | |
| 865 } | |
| 866 | |
| 867 // Save in(1) so that it cannot be changed or deleted | |
| 868 hook->init_req(0, in(1)); | |
| 869 | |
| 870 // Divide using the transform from DivI to MulL | |
| 145 | 871 Node *result = transform_int_divide( phase, in(1), pos_con ); |
| 872 if (result != NULL) { | |
| 873 Node *divide = phase->transform(result); | |
| 0 | 874 |
| 145 | 875 // Re-multiply, using a shift if this is a power of two |
| 876 Node *mult = NULL; | |
| 0 | 877 |
| 145 | 878 if( log2_con >= 0 ) |
| 879 mult = phase->transform( new (phase->C, 3) LShiftINode( divide, phase->intcon( log2_con ) ) ); | |
| 880 else | |
| 881 mult = phase->transform( new (phase->C, 3) MulINode( divide, phase->intcon( pos_con ) ) ); | |
| 0 | 882 |
| 145 | 883 // Finally, subtract the multiplied divided value from the original |
| 884 result = new (phase->C, 3) SubINode( in(1), mult ); | |
| 885 } | |
| 0 | 886 |
| 887 // Now remove the bogus extra edges used to keep things alive | |
| 888 if (can_reshape) { | |
| 889 phase->is_IterGVN()->remove_dead_node(hook); | |
| 890 } else { | |
| 891 hook->set_req(0, NULL); // Just yank bogus edge during Parse phase | |
| 892 } | |
| 893 | |
| 894 // return the value | |
| 895 return result; | |
| 896 } | |
| 897 | |
| 898 //------------------------------Value------------------------------------------ | |
| 899 const Type *ModINode::Value( PhaseTransform *phase ) const { | |
| 900 // Either input is TOP ==> the result is TOP | |
| 901 const Type *t1 = phase->type( in(1) ); | |
| 902 const Type *t2 = phase->type( in(2) ); | |
| 903 if( t1 == Type::TOP ) return Type::TOP; | |
| 904 if( t2 == Type::TOP ) return Type::TOP; | |
| 905 | |
| 906 // We always generate the dynamic check for 0. | |
| 907 // 0 MOD X is 0 | |
| 908 if( t1 == TypeInt::ZERO ) return TypeInt::ZERO; | |
| 909 // X MOD X is 0 | |
| 910 if( phase->eqv( in(1), in(2) ) ) return TypeInt::ZERO; | |
| 911 | |
| 912 // Either input is BOTTOM ==> the result is the local BOTTOM | |
| 913 const Type *bot = bottom_type(); | |
| 914 if( (t1 == bot) || (t2 == bot) || | |
| 915 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
| 916 return bot; | |
| 917 | |
| 918 const TypeInt *i1 = t1->is_int(); | |
| 919 const TypeInt *i2 = t2->is_int(); | |
| 920 if( !i1->is_con() || !i2->is_con() ) { | |
| 921 if( i1->_lo >= 0 && i2->_lo >= 0 ) | |
| 922 return TypeInt::POS; | |
| 923 // If both numbers are not constants, we know little. | |
| 924 return TypeInt::INT; | |
| 925 } | |
| 926 // Mod by zero? Throw exception at runtime! | |
| 927 if( !i2->get_con() ) return TypeInt::POS; | |
| 928 | |
| 929 // We must be modulo'ing 2 float constants. | |
| 930 // Check for min_jint % '-1', result is defined to be '0'. | |
| 931 if( i1->get_con() == min_jint && i2->get_con() == -1 ) | |
| 932 return TypeInt::ZERO; | |
| 933 | |
| 934 return TypeInt::make( i1->get_con() % i2->get_con() ); | |
| 935 } | |
| 936 | |
| 937 | |
| 938 //============================================================================= | |
| 939 //------------------------------Idealize--------------------------------------- | |
| 940 Node *ModLNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 941 // Check for dead control input | |
| 305 | 942 if( in(0) && remove_dead_region(phase, can_reshape) ) return this; |
| 943 // Don't bother trying to transform a dead node | |
| 944 if( in(0) && in(0)->is_top() ) return NULL; | |
| 0 | 945 |
| 946 // Get the modulus | |
| 947 const Type *t = phase->type( in(2) ); | |
| 948 if( t == Type::TOP ) return NULL; | |
| 145 | 949 const TypeLong *tl = t->is_long(); |
| 0 | 950 |
| 951 // Check for useless control input | |
| 952 // Check for excluding mod-zero case | |
| 145 | 953 if( in(0) && (tl->_hi < 0 || tl->_lo > 0) ) { |
| 0 | 954 set_req(0, NULL); // Yank control input |
| 955 return this; | |
| 956 } | |
| 957 | |
| 958 // See if we are MOD'ing by 2^k or 2^k-1. | |
| 145 | 959 if( !tl->is_con() ) return NULL; |
| 960 jlong con = tl->get_con(); | |
| 961 | |
| 962 Node *hook = new (phase->C, 1) Node(1); | |
| 0 | 963 |
| 964 // Expand mod | |
| 145 | 965 if( con >= 0 && con < max_jlong && is_power_of_2_long(con+1) ) { |
| 966 uint k = log2_long(con); // Extract k | |
| 967 | |
| 0 | 968 // Basic algorithm by David Detlefs. See fastmod_long.java for gory details. |
| 969 // Used to help a popular random number generator which does a long-mod | |
| 970 // of 2^31-1 and shows up in SpecJBB and SciMark. | |
| 971 static int unroll_factor[] = { 999, 999, 61, 30, 20, 15, 12, 10, 8, 7, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1 /*past here we assume 1 forever*/}; | |
| 972 int trip_count = 1; | |
| 973 if( k < ARRAY_SIZE(unroll_factor)) trip_count = unroll_factor[k]; | |
| 974 | |
| 145 | 975 // If the unroll factor is not too large, and if conditional moves are |
| 976 // ok, then use this case | |
| 977 if( trip_count <= 5 && ConditionalMoveLimit != 0 ) { | |
| 978 Node *x = in(1); // Value being mod'd | |
| 979 Node *divisor = in(2); // Also is mask | |
| 0 | 980 |
| 145 | 981 hook->init_req(0, x); // Add a use to x to prevent him from dying |
| 982 // Generate code to reduce X rapidly to nearly 2^k-1. | |
| 983 for( int i = 0; i < trip_count; i++ ) { | |
| 0 | 984 Node *xl = phase->transform( new (phase->C, 3) AndLNode(x,divisor) ); |
| 985 Node *xh = phase->transform( new (phase->C, 3) RShiftLNode(x,phase->intcon(k)) ); // Must be signed | |
| 986 x = phase->transform( new (phase->C, 3) AddLNode(xh,xl) ); | |
| 987 hook->set_req(0, x); // Add a use to x to prevent him from dying | |
| 145 | 988 } |
| 989 | |
| 990 // Generate sign-fixup code. Was original value positive? | |
| 991 // long hack_res = (i >= 0) ? divisor : CONST64(1); | |
| 992 Node *cmp1 = phase->transform( new (phase->C, 3) CmpLNode( in(1), phase->longcon(0) ) ); | |
| 993 Node *bol1 = phase->transform( new (phase->C, 2) BoolNode( cmp1, BoolTest::ge ) ); | |
| 994 Node *cmov1= phase->transform( new (phase->C, 4) CMoveLNode(bol1, phase->longcon(1), divisor, TypeLong::LONG) ); | |
| 995 // if( x >= hack_res ) x -= divisor; | |
| 996 Node *sub = phase->transform( new (phase->C, 3) SubLNode( x, divisor ) ); | |
| 997 Node *cmp2 = phase->transform( new (phase->C, 3) CmpLNode( x, cmov1 ) ); | |
| 998 Node *bol2 = phase->transform( new (phase->C, 2) BoolNode( cmp2, BoolTest::ge ) ); | |
| 999 // Convention is to not transform the return value of an Ideal | |
| 1000 // since Ideal is expected to return a modified 'this' or a new node. | |
| 1001 Node *cmov2= new (phase->C, 4) CMoveLNode(bol2, x, sub, TypeLong::LONG); | |
| 1002 // cmov2 is now the mod | |
| 1003 | |
| 1004 // Now remove the bogus extra edges used to keep things alive | |
| 1005 if (can_reshape) { | |
| 1006 phase->is_IterGVN()->remove_dead_node(hook); | |
| 1007 } else { | |
| 1008 hook->set_req(0, NULL); // Just yank bogus edge during Parse phase | |
| 1009 } | |
| 1010 return cmov2; | |
| 0 | 1011 } |
| 145 | 1012 } |
| 1013 | |
| 1014 // Fell thru, the unroll case is not appropriate. Transform the modulo | |
| 1015 // into a long multiply/int multiply/subtract case | |
| 1016 | |
| 1017 // Cannot handle mod 0, and min_jint isn't handled by the transform | |
| 1018 if( con == 0 || con == min_jlong ) return NULL; | |
| 1019 | |
| 1020 // Get the absolute value of the constant; at this point, we can use this | |
| 1021 jlong pos_con = (con >= 0) ? con : -con; | |
| 1022 | |
| 1023 // integer Mod 1 is always 0 | |
| 1024 if( pos_con == 1 ) return new (phase->C, 1) ConLNode(TypeLong::ZERO); | |
| 1025 | |
| 1026 int log2_con = -1; | |
| 1027 | |
| 1028 // If this is a power of two, they maybe we can mask it | |
| 1029 if( is_power_of_2_long(pos_con) ) { | |
| 1030 log2_con = log2_long(pos_con); | |
| 1031 | |
| 1032 const Type *dt = phase->type(in(1)); | |
| 1033 const TypeLong *dtl = dt->isa_long(); | |
| 1034 | |
| 1035 // See if this can be masked, if the dividend is non-negative | |
| 1036 if( dtl && dtl->_lo >= 0 ) | |
| 1037 return ( new (phase->C, 3) AndLNode( in(1), phase->longcon( pos_con-1 ) ) ); | |
| 1038 } | |
| 0 | 1039 |
| 145 | 1040 // Save in(1) so that it cannot be changed or deleted |
| 1041 hook->init_req(0, in(1)); | |
| 1042 | |
| 1043 // Divide using the transform from DivI to MulL | |
| 1044 Node *result = transform_long_divide( phase, in(1), pos_con ); | |
| 1045 if (result != NULL) { | |
| 1046 Node *divide = phase->transform(result); | |
| 1047 | |
| 1048 // Re-multiply, using a shift if this is a power of two | |
| 1049 Node *mult = NULL; | |
| 1050 | |
| 1051 if( log2_con >= 0 ) | |
| 1052 mult = phase->transform( new (phase->C, 3) LShiftLNode( divide, phase->intcon( log2_con ) ) ); | |
| 1053 else | |
| 1054 mult = phase->transform( new (phase->C, 3) MulLNode( divide, phase->longcon( pos_con ) ) ); | |
| 1055 | |
| 1056 // Finally, subtract the multiplied divided value from the original | |
| 1057 result = new (phase->C, 3) SubLNode( in(1), mult ); | |
| 0 | 1058 } |
| 145 | 1059 |
| 1060 // Now remove the bogus extra edges used to keep things alive | |
| 1061 if (can_reshape) { | |
| 1062 phase->is_IterGVN()->remove_dead_node(hook); | |
| 1063 } else { | |
| 1064 hook->set_req(0, NULL); // Just yank bogus edge during Parse phase | |
| 1065 } | |
| 1066 | |
| 1067 // return the value | |
| 1068 return result; | |
| 0 | 1069 } |
| 1070 | |
| 1071 //------------------------------Value------------------------------------------ | |
| 1072 const Type *ModLNode::Value( PhaseTransform *phase ) const { | |
| 1073 // Either input is TOP ==> the result is TOP | |
| 1074 const Type *t1 = phase->type( in(1) ); | |
| 1075 const Type *t2 = phase->type( in(2) ); | |
| 1076 if( t1 == Type::TOP ) return Type::TOP; | |
| 1077 if( t2 == Type::TOP ) return Type::TOP; | |
| 1078 | |
| 1079 // We always generate the dynamic check for 0. | |
| 1080 // 0 MOD X is 0 | |
| 1081 if( t1 == TypeLong::ZERO ) return TypeLong::ZERO; | |
| 1082 // X MOD X is 0 | |
| 1083 if( phase->eqv( in(1), in(2) ) ) return TypeLong::ZERO; | |
| 1084 | |
| 1085 // Either input is BOTTOM ==> the result is the local BOTTOM | |
| 1086 const Type *bot = bottom_type(); | |
| 1087 if( (t1 == bot) || (t2 == bot) || | |
| 1088 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
| 1089 return bot; | |
| 1090 | |
| 1091 const TypeLong *i1 = t1->is_long(); | |
| 1092 const TypeLong *i2 = t2->is_long(); | |
| 1093 if( !i1->is_con() || !i2->is_con() ) { | |
| 1094 if( i1->_lo >= CONST64(0) && i2->_lo >= CONST64(0) ) | |
| 1095 return TypeLong::POS; | |
| 1096 // If both numbers are not constants, we know little. | |
| 1097 return TypeLong::LONG; | |
| 1098 } | |
| 1099 // Mod by zero? Throw exception at runtime! | |
| 1100 if( !i2->get_con() ) return TypeLong::POS; | |
| 1101 | |
| 1102 // We must be modulo'ing 2 float constants. | |
| 1103 // Check for min_jint % '-1', result is defined to be '0'. | |
| 1104 if( i1->get_con() == min_jlong && i2->get_con() == -1 ) | |
| 1105 return TypeLong::ZERO; | |
| 1106 | |
| 1107 return TypeLong::make( i1->get_con() % i2->get_con() ); | |
| 1108 } | |
| 1109 | |
| 1110 | |
| 1111 //============================================================================= | |
| 1112 //------------------------------Value------------------------------------------ | |
| 1113 const Type *ModFNode::Value( PhaseTransform *phase ) const { | |
| 1114 // Either input is TOP ==> the result is TOP | |
| 1115 const Type *t1 = phase->type( in(1) ); | |
| 1116 const Type *t2 = phase->type( in(2) ); | |
| 1117 if( t1 == Type::TOP ) return Type::TOP; | |
| 1118 if( t2 == Type::TOP ) return Type::TOP; | |
| 1119 | |
| 1120 // Either input is BOTTOM ==> the result is the local BOTTOM | |
| 1121 const Type *bot = bottom_type(); | |
| 1122 if( (t1 == bot) || (t2 == bot) || | |
| 1123 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
| 1124 return bot; | |
| 1125 | |
|
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1126 // If either number is not a constant, we know nothing. |
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1127 if ((t1->base() != Type::FloatCon) || (t2->base() != Type::FloatCon)) { |
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1128 return Type::FLOAT; // note: x%x can be either NaN or 0 |
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1129 } |
| 0 | 1130 |
|
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1131 float f1 = t1->getf(); |
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1132 float f2 = t2->getf(); |
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1133 jint x1 = jint_cast(f1); // note: *(int*)&f1, not just (int)f1 |
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1134 jint x2 = jint_cast(f2); |
| 0 | 1135 |
|
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1136 // If either is a NaN, return an input NaN |
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1137 if (g_isnan(f1)) return t1; |
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1138 if (g_isnan(f2)) return t2; |
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1139 |
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1140 // If an operand is infinity or the divisor is +/- zero, punt. |
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1141 if (!g_isfinite(f1) || !g_isfinite(f2) || x2 == 0 || x2 == min_jint) |
| 0 | 1142 return Type::FLOAT; |
| 1143 | |
| 1144 // We must be modulo'ing 2 float constants. | |
| 1145 // Make sure that the sign of the fmod is equal to the sign of the dividend | |
|
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1146 jint xr = jint_cast(fmod(f1, f2)); |
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1147 if ((x1 ^ xr) < 0) { |
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1148 xr ^= min_jint; |
| 0 | 1149 } |
|
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1150 |
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1151 return TypeF::make(jfloat_cast(xr)); |
| 0 | 1152 } |
| 1153 | |
| 1154 | |
| 1155 //============================================================================= | |
| 1156 //------------------------------Value------------------------------------------ | |
| 1157 const Type *ModDNode::Value( PhaseTransform *phase ) const { | |
| 1158 // Either input is TOP ==> the result is TOP | |
| 1159 const Type *t1 = phase->type( in(1) ); | |
| 1160 const Type *t2 = phase->type( in(2) ); | |
| 1161 if( t1 == Type::TOP ) return Type::TOP; | |
| 1162 if( t2 == Type::TOP ) return Type::TOP; | |
| 1163 | |
| 1164 // Either input is BOTTOM ==> the result is the local BOTTOM | |
| 1165 const Type *bot = bottom_type(); | |
| 1166 if( (t1 == bot) || (t2 == bot) || | |
| 1167 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
| 1168 return bot; | |
| 1169 | |
|
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1170 // If either number is not a constant, we know nothing. |
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1171 if ((t1->base() != Type::DoubleCon) || (t2->base() != Type::DoubleCon)) { |
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1172 return Type::DOUBLE; // note: x%x can be either NaN or 0 |
| 0 | 1173 } |
| 1174 | |
|
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1175 double f1 = t1->getd(); |
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1176 double f2 = t2->getd(); |
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1177 jlong x1 = jlong_cast(f1); // note: *(long*)&f1, not just (long)f1 |
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1178 jlong x2 = jlong_cast(f2); |
| 0 | 1179 |
|
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1180 // If either is a NaN, return an input NaN |
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1181 if (g_isnan(f1)) return t1; |
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1182 if (g_isnan(f2)) return t2; |
| 0 | 1183 |
|
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1184 // If an operand is infinity or the divisor is +/- zero, punt. |
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1185 if (!g_isfinite(f1) || !g_isfinite(f2) || x2 == 0 || x2 == min_jlong) |
| 0 | 1186 return Type::DOUBLE; |
| 1187 | |
| 1188 // We must be modulo'ing 2 double constants. | |
|
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1189 // Make sure that the sign of the fmod is equal to the sign of the dividend |
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1190 jlong xr = jlong_cast(fmod(f1, f2)); |
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1191 if ((x1 ^ xr) < 0) { |
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1192 xr ^= min_jlong; |
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1193 } |
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1194 |
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1195 return TypeD::make(jdouble_cast(xr)); |
| 0 | 1196 } |
| 1197 | |
| 1198 //============================================================================= | |
| 1199 | |
| 1200 DivModNode::DivModNode( Node *c, Node *dividend, Node *divisor ) : MultiNode(3) { | |
| 1201 init_req(0, c); | |
| 1202 init_req(1, dividend); | |
| 1203 init_req(2, divisor); | |
| 1204 } | |
| 1205 | |
| 1206 //------------------------------make------------------------------------------ | |
| 1207 DivModINode* DivModINode::make(Compile* C, Node* div_or_mod) { | |
| 1208 Node* n = div_or_mod; | |
| 1209 assert(n->Opcode() == Op_DivI || n->Opcode() == Op_ModI, | |
| 1210 "only div or mod input pattern accepted"); | |
| 1211 | |
| 1212 DivModINode* divmod = new (C, 3) DivModINode(n->in(0), n->in(1), n->in(2)); | |
| 1213 Node* dproj = new (C, 1) ProjNode(divmod, DivModNode::div_proj_num); | |
| 1214 Node* mproj = new (C, 1) ProjNode(divmod, DivModNode::mod_proj_num); | |
| 1215 return divmod; | |
| 1216 } | |
| 1217 | |
| 1218 //------------------------------make------------------------------------------ | |
| 1219 DivModLNode* DivModLNode::make(Compile* C, Node* div_or_mod) { | |
| 1220 Node* n = div_or_mod; | |
| 1221 assert(n->Opcode() == Op_DivL || n->Opcode() == Op_ModL, | |
| 1222 "only div or mod input pattern accepted"); | |
| 1223 | |
| 1224 DivModLNode* divmod = new (C, 3) DivModLNode(n->in(0), n->in(1), n->in(2)); | |
| 1225 Node* dproj = new (C, 1) ProjNode(divmod, DivModNode::div_proj_num); | |
| 1226 Node* mproj = new (C, 1) ProjNode(divmod, DivModNode::mod_proj_num); | |
| 1227 return divmod; | |
| 1228 } | |
| 1229 | |
| 1230 //------------------------------match------------------------------------------ | |
| 1231 // return result(s) along with their RegMask info | |
| 1232 Node *DivModINode::match( const ProjNode *proj, const Matcher *match ) { | |
| 1233 uint ideal_reg = proj->ideal_reg(); | |
| 1234 RegMask rm; | |
| 1235 if (proj->_con == div_proj_num) { | |
| 1236 rm = match->divI_proj_mask(); | |
| 1237 } else { | |
| 1238 assert(proj->_con == mod_proj_num, "must be div or mod projection"); | |
| 1239 rm = match->modI_proj_mask(); | |
| 1240 } | |
| 1241 return new (match->C, 1)MachProjNode(this, proj->_con, rm, ideal_reg); | |
| 1242 } | |
| 1243 | |
| 1244 | |
| 1245 //------------------------------match------------------------------------------ | |
| 1246 // return result(s) along with their RegMask info | |
| 1247 Node *DivModLNode::match( const ProjNode *proj, const Matcher *match ) { | |
| 1248 uint ideal_reg = proj->ideal_reg(); | |
| 1249 RegMask rm; | |
| 1250 if (proj->_con == div_proj_num) { | |
| 1251 rm = match->divL_proj_mask(); | |
| 1252 } else { | |
| 1253 assert(proj->_con == mod_proj_num, "must be div or mod projection"); | |
| 1254 rm = match->modL_proj_mask(); | |
| 1255 } | |
| 1256 return new (match->C, 1)MachProjNode(this, proj->_con, rm, ideal_reg); | |
| 1257 } |