Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/regmask.hpp @ 23886:5601e440e5e7
8130150: Implement BigInteger.montgomeryMultiply intrinsic
Reviewed-by: kvn, mdoerr
author | vkempik |
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date | Fri, 04 Mar 2016 16:15:48 +0300 |
parents | ddce0b7cee93 |
children | dd9cc155639c |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OPTO_REGMASK_HPP |
26 #define SHARE_VM_OPTO_REGMASK_HPP | |
27 | |
28 #include "code/vmreg.hpp" | |
29 #include "libadt/port.hpp" | |
30 #include "opto/optoreg.hpp" | |
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31 #if defined ADGLOBALS_MD_HPP |
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32 # include ADGLOBALS_MD_HPP |
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33 #elif defined TARGET_ARCH_MODEL_x86_32 |
1972 | 34 # include "adfiles/adGlobals_x86_32.hpp" |
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35 #elif defined TARGET_ARCH_MODEL_x86_64 |
1972 | 36 # include "adfiles/adGlobals_x86_64.hpp" |
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37 #elif defined TARGET_ARCH_MODEL_sparc |
1972 | 38 # include "adfiles/adGlobals_sparc.hpp" |
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39 #elif defined TARGET_ARCH_MODEL_zero |
1972 | 40 # include "adfiles/adGlobals_zero.hpp" |
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41 #elif defined TARGET_ARCH_MODEL_ppc_64 |
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43 #endif |
1972 | 44 |
0 | 45 // Some fun naming (textual) substitutions: |
46 // | |
47 // RegMask::get_low_elem() ==> RegMask::find_first_elem() | |
48 // RegMask::Special ==> RegMask::Empty | |
49 // RegMask::_flags ==> RegMask::is_AllStack() | |
50 // RegMask::operator<<=() ==> RegMask::Insert() | |
51 // RegMask::operator>>=() ==> RegMask::Remove() | |
52 // RegMask::Union() ==> RegMask::OR | |
53 // RegMask::Inter() ==> RegMask::AND | |
54 // | |
55 // OptoRegister::RegName ==> OptoReg::Name | |
56 // | |
57 // OptoReg::stack0() ==> _last_Mach_Reg or ZERO in core version | |
58 // | |
59 // numregs in chaitin ==> proper degree in chaitin | |
60 | |
61 //-------------Non-zero bit search methods used by RegMask--------------------- | |
62 // Find lowest 1, or return 32 if empty | |
63 int find_lowest_bit( uint32 mask ); | |
64 // Find highest 1, or return 32 if empty | |
65 int find_hihghest_bit( uint32 mask ); | |
66 | |
67 //------------------------------RegMask---------------------------------------- | |
68 // The ADL file describes how to print the machine-specific registers, as well | |
69 // as any notion of register classes. We provide a register mask, which is | |
70 // just a collection of Register numbers. | |
71 | |
72 // The ADLC defines 2 macros, RM_SIZE and FORALL_BODY. | |
73 // RM_SIZE is the size of a register mask in words. | |
74 // FORALL_BODY replicates a BODY macro once per word in the register mask. | |
75 // The usage is somewhat clumsy and limited to the regmask.[h,c]pp files. | |
76 // However, it means the ADLC can redefine the unroll macro and all loops | |
77 // over register masks will be unrolled by the correct amount. | |
78 | |
79 class RegMask VALUE_OBJ_CLASS_SPEC { | |
80 union { | |
81 double _dummy_force_double_alignment[RM_SIZE>>1]; | |
82 // Array of Register Mask bits. This array is large enough to cover | |
83 // all the machine registers and all parameters that need to be passed | |
84 // on the stack (stack registers) up to some interesting limit. Methods | |
85 // that need more parameters will NOT be compiled. On Intel, the limit | |
86 // is something like 90+ parameters. | |
87 int _A[RM_SIZE]; | |
88 }; | |
89 | |
90 enum { | |
91 _WordBits = BitsPerInt, | |
92 _LogWordBits = LogBitsPerInt, | |
93 _RM_SIZE = RM_SIZE // local constant, imported, then hidden by #undef | |
94 }; | |
95 | |
96 public: | |
97 enum { CHUNK_SIZE = RM_SIZE*_WordBits }; | |
98 | |
99 // SlotsPerLong is 2, since slots are 32 bits and longs are 64 bits. | |
100 // Also, consider the maximum alignment size for a normally allocated | |
101 // value. Since we allocate register pairs but not register quads (at | |
102 // present), this alignment is SlotsPerLong (== 2). A normally | |
103 // aligned allocated register is either a single register, or a pair | |
104 // of adjacent registers, the lower-numbered being even. | |
105 // See also is_aligned_Pairs() below, and the padding added before | |
106 // Matcher::_new_SP to keep allocated pairs aligned properly. | |
107 // If we ever go to quad-word allocations, SlotsPerQuad will become | |
108 // the controlling alignment constraint. Note that this alignment | |
109 // requirement is internal to the allocator, and independent of any | |
110 // particular platform. | |
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111 enum { SlotsPerLong = 2, |
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112 SlotsPerVecS = 1, |
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113 SlotsPerVecD = 2, |
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114 SlotsPerVecX = 4, |
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115 SlotsPerVecY = 8 }; |
0 | 116 |
117 // A constructor only used by the ADLC output. All mask fields are filled | |
118 // in directly. Calls to this look something like RM(1,2,3,4); | |
119 RegMask( | |
120 # define BODY(I) int a##I, | |
121 FORALL_BODY | |
122 # undef BODY | |
123 int dummy = 0 ) { | |
124 # define BODY(I) _A[I] = a##I; | |
125 FORALL_BODY | |
126 # undef BODY | |
127 } | |
128 | |
129 // Handy copying constructor | |
130 RegMask( RegMask *rm ) { | |
131 # define BODY(I) _A[I] = rm->_A[I]; | |
132 FORALL_BODY | |
133 # undef BODY | |
134 } | |
135 | |
136 // Construct an empty mask | |
137 RegMask( ) { Clear(); } | |
138 | |
139 // Construct a mask with a single bit | |
140 RegMask( OptoReg::Name reg ) { Clear(); Insert(reg); } | |
141 | |
142 // Check for register being in mask | |
143 int Member( OptoReg::Name reg ) const { | |
144 assert( reg < CHUNK_SIZE, "" ); | |
145 return _A[reg>>_LogWordBits] & (1<<(reg&(_WordBits-1))); | |
146 } | |
147 | |
148 // The last bit in the register mask indicates that the mask should repeat | |
149 // indefinitely with ONE bits. Returns TRUE if mask is infinite or | |
150 // unbounded in size. Returns FALSE if mask is finite size. | |
151 int is_AllStack() const { return _A[RM_SIZE-1] >> (_WordBits-1); } | |
152 | |
153 // Work around an -xO3 optimization problme in WS6U1. The old way: | |
154 // void set_AllStack() { _A[RM_SIZE-1] |= (1<<(_WordBits-1)); } | |
155 // will cause _A[RM_SIZE-1] to be clobbered, not updated when set_AllStack() | |
156 // follows an Insert() loop, like the one found in init_spill_mask(). Using | |
157 // Insert() instead works because the index into _A in computed instead of | |
158 // constant. See bug 4665841. | |
159 void set_AllStack() { Insert(OptoReg::Name(CHUNK_SIZE-1)); } | |
160 | |
161 // Test for being a not-empty mask. | |
162 int is_NotEmpty( ) const { | |
163 int tmp = 0; | |
164 # define BODY(I) tmp |= _A[I]; | |
165 FORALL_BODY | |
166 # undef BODY | |
167 return tmp; | |
168 } | |
169 | |
170 // Find lowest-numbered register from mask, or BAD if mask is empty. | |
171 OptoReg::Name find_first_elem() const { | |
172 int base, bits; | |
173 # define BODY(I) if( (bits = _A[I]) != 0 ) base = I<<_LogWordBits; else | |
174 FORALL_BODY | |
175 # undef BODY | |
176 { base = OptoReg::Bad; bits = 1<<0; } | |
177 return OptoReg::Name(base + find_lowest_bit(bits)); | |
178 } | |
179 // Get highest-numbered register from mask, or BAD if mask is empty. | |
180 OptoReg::Name find_last_elem() const { | |
181 int base, bits; | |
182 # define BODY(I) if( (bits = _A[RM_SIZE-1-I]) != 0 ) base = (RM_SIZE-1-I)<<_LogWordBits; else | |
183 FORALL_BODY | |
184 # undef BODY | |
185 { base = OptoReg::Bad; bits = 1<<0; } | |
186 return OptoReg::Name(base + find_hihghest_bit(bits)); | |
187 } | |
188 | |
189 // Find the lowest-numbered register pair in the mask. Return the | |
190 // HIGHEST register number in the pair, or BAD if no pairs. | |
191 // Assert that the mask contains only bit pairs. | |
192 OptoReg::Name find_first_pair() const; | |
193 | |
194 // Clear out partial bits; leave only aligned adjacent bit pairs. | |
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195 void clear_to_pairs(); |
0 | 196 // Smear out partial bits; leave only aligned adjacent bit pairs. |
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197 void smear_to_pairs(); |
0 | 198 // Verify that the mask contains only aligned adjacent bit pairs |
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199 void verify_pairs() const { assert( is_aligned_pairs(), "mask is not aligned, adjacent pairs" ); } |
0 | 200 // Test that the mask contains only aligned adjacent bit pairs |
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201 bool is_aligned_pairs() const; |
0 | 202 |
203 // mask is a pair of misaligned registers | |
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204 bool is_misaligned_pair() const { return Size()==2 && !is_aligned_pairs(); } |
0 | 205 // Test for single register |
206 int is_bound1() const; | |
207 // Test for a single adjacent pair | |
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208 int is_bound_pair() const; |
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209 // Test for a single adjacent set of ideal register's size. |
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210 int is_bound(uint ireg) const { |
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211 if (is_vector(ireg)) { |
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212 if (is_bound_set(num_registers(ireg))) |
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213 return true; |
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214 } else if (is_bound1() || is_bound_pair()) { |
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215 return true; |
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216 } |
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217 return false; |
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218 } |
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219 |
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220 // Find the lowest-numbered register set in the mask. Return the |
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221 // HIGHEST register number in the set, or BAD if no sets. |
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222 // Assert that the mask contains only bit sets. |
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223 OptoReg::Name find_first_set(const int size) const; |
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224 |
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225 // Clear out partial bits; leave only aligned adjacent bit sets of size. |
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226 void clear_to_sets(const int size); |
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227 // Smear out partial bits to aligned adjacent bit sets. |
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228 void smear_to_sets(const int size); |
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229 // Verify that the mask contains only aligned adjacent bit sets |
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230 void verify_sets(int size) const { assert(is_aligned_sets(size), "mask is not aligned, adjacent sets"); } |
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231 // Test that the mask contains only aligned adjacent bit sets |
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232 bool is_aligned_sets(const int size) const; |
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233 |
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234 // mask is a set of misaligned registers |
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235 bool is_misaligned_set(int size) const { return (int)Size()==size && !is_aligned_sets(size);} |
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236 |
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237 // Test for a single adjacent set |
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238 int is_bound_set(const int size) const; |
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239 |
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240 static bool is_vector(uint ireg); |
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241 static int num_registers(uint ireg); |
0 | 242 |
243 // Fast overlap test. Non-zero if any registers in common. | |
244 int overlap( const RegMask &rm ) const { | |
245 return | |
246 # define BODY(I) (_A[I] & rm._A[I]) | | |
247 FORALL_BODY | |
248 # undef BODY | |
249 0 ; | |
250 } | |
251 | |
252 // Special test for register pressure based splitting | |
253 // UP means register only, Register plus stack, or stack only is DOWN | |
254 bool is_UP() const; | |
255 | |
256 // Clear a register mask | |
257 void Clear( ) { | |
258 # define BODY(I) _A[I] = 0; | |
259 FORALL_BODY | |
260 # undef BODY | |
261 } | |
262 | |
263 // Fill a register mask with 1's | |
264 void Set_All( ) { | |
265 # define BODY(I) _A[I] = -1; | |
266 FORALL_BODY | |
267 # undef BODY | |
268 } | |
269 | |
270 // Insert register into mask | |
271 void Insert( OptoReg::Name reg ) { | |
272 assert( reg < CHUNK_SIZE, "" ); | |
273 _A[reg>>_LogWordBits] |= (1<<(reg&(_WordBits-1))); | |
274 } | |
275 | |
276 // Remove register from mask | |
277 void Remove( OptoReg::Name reg ) { | |
278 assert( reg < CHUNK_SIZE, "" ); | |
279 _A[reg>>_LogWordBits] &= ~(1<<(reg&(_WordBits-1))); | |
280 } | |
281 | |
282 // OR 'rm' into 'this' | |
283 void OR( const RegMask &rm ) { | |
284 # define BODY(I) this->_A[I] |= rm._A[I]; | |
285 FORALL_BODY | |
286 # undef BODY | |
287 } | |
288 | |
289 // AND 'rm' into 'this' | |
290 void AND( const RegMask &rm ) { | |
291 # define BODY(I) this->_A[I] &= rm._A[I]; | |
292 FORALL_BODY | |
293 # undef BODY | |
294 } | |
295 | |
296 // Subtract 'rm' from 'this' | |
297 void SUBTRACT( const RegMask &rm ) { | |
298 # define BODY(I) _A[I] &= ~rm._A[I]; | |
299 FORALL_BODY | |
300 # undef BODY | |
301 } | |
302 | |
303 // Compute size of register mask: number of bits | |
304 uint Size() const; | |
305 | |
306 #ifndef PRODUCT | |
307 void print() const { dump(); } | |
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308 void dump(outputStream *st = tty) const; // Print a mask |
0 | 309 #endif |
310 | |
311 static const RegMask Empty; // Common empty mask | |
312 | |
313 static bool can_represent(OptoReg::Name reg) { | |
314 // NOTE: -1 in computation reflects the usage of the last | |
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315 // bit of the regmask as an infinite stack flag and |
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316 // -7 is to keep mask aligned for largest value (VecY). |
0 | 317 return (int)reg < (int)(CHUNK_SIZE-1); |
318 } | |
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319 static bool can_represent_arg(OptoReg::Name reg) { |
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320 // NOTE: -SlotsPerVecY in computation reflects the need |
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321 // to keep mask aligned for largest value (VecY). |
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322 return (int)reg < (int)(CHUNK_SIZE-SlotsPerVecY); |
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323 } |
0 | 324 }; |
325 | |
326 // Do not use this constant directly in client code! | |
327 #undef RM_SIZE | |
1972 | 328 |
329 #endif // SHARE_VM_OPTO_REGMASK_HPP |