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annotate src/cpu/x86/vm/c1_MacroAssembler_x86.cpp @ 13817:d7ed39d0a6d9
Merge
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Wed, 29 Jan 2014 15:02:19 -0800 |
parents | cefad50507d8 |
children | d8041d695d19 |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2012, 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 #include "precompiled.hpp" |
26 #include "c1/c1_MacroAssembler.hpp" | |
27 #include "c1/c1_Runtime1.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "gc_interface/collectedHeap.hpp" | |
30 #include "interpreter/interpreter.hpp" | |
31 #include "oops/arrayOop.hpp" | |
32 #include "oops/markOop.hpp" | |
33 #include "runtime/basicLock.hpp" | |
34 #include "runtime/biasedLocking.hpp" | |
35 #include "runtime/os.hpp" | |
36 #include "runtime/stubRoutines.hpp" | |
0 | 37 |
38 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register scratch, Label& slow_case) { | |
304 | 39 const int aligned_mask = BytesPerWord -1; |
0 | 40 const int hdr_offset = oopDesc::mark_offset_in_bytes(); |
41 assert(hdr == rax, "hdr must be rax, for the cmpxchg instruction"); | |
42 assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different"); | |
43 Label done; | |
44 int null_check_offset = -1; | |
45 | |
46 verify_oop(obj); | |
47 | |
48 // save object being locked into the BasicObjectLock | |
304 | 49 movptr(Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()), obj); |
0 | 50 |
51 if (UseBiasedLocking) { | |
52 assert(scratch != noreg, "should have scratch register at this point"); | |
53 null_check_offset = biased_locking_enter(disp_hdr, obj, hdr, scratch, false, done, &slow_case); | |
54 } else { | |
55 null_check_offset = offset(); | |
56 } | |
57 | |
58 // Load object header | |
304 | 59 movptr(hdr, Address(obj, hdr_offset)); |
0 | 60 // and mark it as unlocked |
304 | 61 orptr(hdr, markOopDesc::unlocked_value); |
0 | 62 // save unlocked object header into the displaced header location on the stack |
304 | 63 movptr(Address(disp_hdr, 0), hdr); |
0 | 64 // test if object header is still the same (i.e. unlocked), and if so, store the |
65 // displaced header address in the object header - if it is not the same, get the | |
66 // object header instead | |
67 if (os::is_MP()) MacroAssembler::lock(); // must be immediately before cmpxchg! | |
304 | 68 cmpxchgptr(disp_hdr, Address(obj, hdr_offset)); |
0 | 69 // if the object header was the same, we're done |
70 if (PrintBiasedLockingStatistics) { | |
71 cond_inc32(Assembler::equal, | |
72 ExternalAddress((address)BiasedLocking::fast_path_entry_count_addr())); | |
73 } | |
74 jcc(Assembler::equal, done); | |
75 // if the object header was not the same, it is now in the hdr register | |
76 // => test if it is a stack pointer into the same stack (recursive locking), i.e.: | |
77 // | |
78 // 1) (hdr & aligned_mask) == 0 | |
79 // 2) rsp <= hdr | |
80 // 3) hdr <= rsp + page_size | |
81 // | |
82 // these 3 tests can be done by evaluating the following expression: | |
83 // | |
84 // (hdr - rsp) & (aligned_mask - page_size) | |
85 // | |
86 // assuming both the stack pointer and page_size have their least | |
87 // significant 2 bits cleared and page_size is a power of 2 | |
304 | 88 subptr(hdr, rsp); |
89 andptr(hdr, aligned_mask - os::vm_page_size()); | |
0 | 90 // for recursive locking, the result is zero => save it in the displaced header |
91 // location (NULL in the displaced hdr location indicates recursive locking) | |
304 | 92 movptr(Address(disp_hdr, 0), hdr); |
0 | 93 // otherwise we don't care about the result and handle locking via runtime call |
94 jcc(Assembler::notZero, slow_case); | |
95 // done | |
96 bind(done); | |
97 return null_check_offset; | |
98 } | |
99 | |
100 | |
101 void C1_MacroAssembler::unlock_object(Register hdr, Register obj, Register disp_hdr, Label& slow_case) { | |
304 | 102 const int aligned_mask = BytesPerWord -1; |
0 | 103 const int hdr_offset = oopDesc::mark_offset_in_bytes(); |
104 assert(disp_hdr == rax, "disp_hdr must be rax, for the cmpxchg instruction"); | |
105 assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different"); | |
106 Label done; | |
107 | |
108 if (UseBiasedLocking) { | |
109 // load object | |
304 | 110 movptr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes())); |
0 | 111 biased_locking_exit(obj, hdr, done); |
112 } | |
113 | |
114 // load displaced header | |
304 | 115 movptr(hdr, Address(disp_hdr, 0)); |
0 | 116 // if the loaded hdr is NULL we had recursive locking |
304 | 117 testptr(hdr, hdr); |
0 | 118 // if we had recursive locking, we are done |
119 jcc(Assembler::zero, done); | |
120 if (!UseBiasedLocking) { | |
121 // load object | |
304 | 122 movptr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes())); |
0 | 123 } |
124 verify_oop(obj); | |
125 // test if object header is pointing to the displaced header, and if so, restore | |
126 // the displaced header in the object - if the object header is not pointing to | |
127 // the displaced header, get the object header instead | |
128 if (os::is_MP()) MacroAssembler::lock(); // must be immediately before cmpxchg! | |
304 | 129 cmpxchgptr(hdr, Address(obj, hdr_offset)); |
0 | 130 // if the object header was not pointing to the displaced header, |
131 // we do unlocking via runtime call | |
132 jcc(Assembler::notEqual, slow_case); | |
133 // done | |
134 bind(done); | |
135 } | |
136 | |
137 | |
138 // Defines obj, preserves var_size_in_bytes | |
139 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) { | |
140 if (UseTLAB) { | |
141 tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case); | |
142 } else { | |
143 eden_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, slow_case); | |
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144 incr_allocated_bytes(noreg, var_size_in_bytes, con_size_in_bytes, t1); |
0 | 145 } |
146 } | |
147 | |
148 | |
149 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) { | |
150 assert_different_registers(obj, klass, len); | |
151 if (UseBiasedLocking && !len->is_valid()) { | |
152 assert_different_registers(obj, klass, len, t1, t2); | |
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153 movptr(t1, Address(klass, Klass::prototype_header_offset())); |
304 | 154 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), t1); |
0 | 155 } else { |
304 | 156 // This assumes that all prototype bits fit in an int32_t |
157 movptr(Address(obj, oopDesc::mark_offset_in_bytes ()), (int32_t)(intptr_t)markOopDesc::prototype()); | |
0 | 158 } |
2002 | 159 #ifdef _LP64 |
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160 if (UseCompressedClassPointers) { // Take care not to kill klass |
2002 | 161 movptr(t1, klass); |
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162 encode_klass_not_null(t1); |
2002 | 163 movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1); |
164 } else | |
165 #endif | |
166 { | |
167 movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass); | |
168 } | |
0 | 169 |
170 if (len->is_valid()) { | |
171 movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len); | |
172 } | |
2002 | 173 #ifdef _LP64 |
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174 else if (UseCompressedClassPointers) { |
2002 | 175 xorptr(t1, t1); |
176 store_klass_gap(obj, t1); | |
177 } | |
178 #endif | |
0 | 179 } |
180 | |
181 | |
182 // preserves obj, destroys len_in_bytes | |
183 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1) { | |
184 Label done; | |
185 assert(obj != len_in_bytes && obj != t1 && t1 != len_in_bytes, "registers must be different"); | |
186 assert((hdr_size_in_bytes & (BytesPerWord - 1)) == 0, "header size is not a multiple of BytesPerWord"); | |
187 Register index = len_in_bytes; | |
304 | 188 // index is positive and ptr sized |
189 subptr(index, hdr_size_in_bytes); | |
0 | 190 jcc(Assembler::zero, done); |
191 // initialize topmost word, divide index by 2, check if odd and test if zero | |
192 // note: for the remaining code to work, index must be a multiple of BytesPerWord | |
193 #ifdef ASSERT | |
194 { Label L; | |
304 | 195 testptr(index, BytesPerWord - 1); |
0 | 196 jcc(Assembler::zero, L); |
197 stop("index is not a multiple of BytesPerWord"); | |
198 bind(L); | |
199 } | |
200 #endif | |
304 | 201 xorptr(t1, t1); // use _zero reg to clear memory (shorter code) |
0 | 202 if (UseIncDec) { |
304 | 203 shrptr(index, 3); // divide by 8/16 and set carry flag if bit 2 was set |
0 | 204 } else { |
304 | 205 shrptr(index, 2); // use 2 instructions to avoid partial flag stall |
206 shrptr(index, 1); | |
0 | 207 } |
304 | 208 #ifndef _LP64 |
0 | 209 // index could have been not a multiple of 8 (i.e., bit 2 was set) |
210 { Label even; | |
211 // note: if index was a multiple of 8, than it cannot | |
212 // be 0 now otherwise it must have been 0 before | |
213 // => if it is even, we don't need to check for 0 again | |
214 jcc(Assembler::carryClear, even); | |
215 // clear topmost word (no jump needed if conditional assignment would work here) | |
304 | 216 movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 0*BytesPerWord), t1); |
0 | 217 // index could be 0 now, need to check again |
218 jcc(Assembler::zero, done); | |
219 bind(even); | |
220 } | |
304 | 221 #endif // !_LP64 |
0 | 222 // initialize remaining object fields: rdx is a multiple of 2 now |
223 { Label loop; | |
224 bind(loop); | |
304 | 225 movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 1*BytesPerWord), t1); |
226 NOT_LP64(movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 2*BytesPerWord), t1);) | |
0 | 227 decrement(index); |
228 jcc(Assembler::notZero, loop); | |
229 } | |
230 | |
231 // done | |
232 bind(done); | |
233 } | |
234 | |
235 | |
236 void C1_MacroAssembler::allocate_object(Register obj, Register t1, Register t2, int header_size, int object_size, Register klass, Label& slow_case) { | |
237 assert(obj == rax, "obj must be in rax, for cmpxchg"); | |
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238 assert_different_registers(obj, t1, t2); // XXX really? |
0 | 239 assert(header_size >= 0 && object_size >= header_size, "illegal sizes"); |
240 | |
241 try_allocate(obj, noreg, object_size * BytesPerWord, t1, t2, slow_case); | |
242 | |
243 initialize_object(obj, klass, noreg, object_size * HeapWordSize, t1, t2); | |
244 } | |
245 | |
246 void C1_MacroAssembler::initialize_object(Register obj, Register klass, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2) { | |
247 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0, | |
248 "con_size_in_bytes is not multiple of alignment"); | |
2002 | 249 const int hdr_size_in_bytes = instanceOopDesc::header_size() * HeapWordSize; |
0 | 250 |
251 initialize_header(obj, klass, noreg, t1, t2); | |
252 | |
253 // clear rest of allocated space | |
254 const Register t1_zero = t1; | |
255 const Register index = t2; | |
256 const int threshold = 6 * BytesPerWord; // approximate break even point for code size (see comments below) | |
257 if (var_size_in_bytes != noreg) { | |
304 | 258 mov(index, var_size_in_bytes); |
0 | 259 initialize_body(obj, index, hdr_size_in_bytes, t1_zero); |
260 } else if (con_size_in_bytes <= threshold) { | |
261 // use explicit null stores | |
262 // code size = 2 + 3*n bytes (n = number of fields to clear) | |
304 | 263 xorptr(t1_zero, t1_zero); // use t1_zero reg to clear memory (shorter code) |
0 | 264 for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += BytesPerWord) |
304 | 265 movptr(Address(obj, i), t1_zero); |
0 | 266 } else if (con_size_in_bytes > hdr_size_in_bytes) { |
267 // use loop to null out the fields | |
268 // code size = 16 bytes for even n (n = number of fields to clear) | |
269 // initialize last object field first if odd number of fields | |
304 | 270 xorptr(t1_zero, t1_zero); // use t1_zero reg to clear memory (shorter code) |
271 movptr(index, (con_size_in_bytes - hdr_size_in_bytes) >> 3); | |
0 | 272 // initialize last object field if constant size is odd |
273 if (((con_size_in_bytes - hdr_size_in_bytes) & 4) != 0) | |
304 | 274 movptr(Address(obj, con_size_in_bytes - (1*BytesPerWord)), t1_zero); |
0 | 275 // initialize remaining object fields: rdx is a multiple of 2 |
276 { Label loop; | |
277 bind(loop); | |
304 | 278 movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (1*BytesPerWord)), |
279 t1_zero); | |
280 NOT_LP64(movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (2*BytesPerWord)), | |
281 t1_zero);) | |
0 | 282 decrement(index); |
283 jcc(Assembler::notZero, loop); | |
284 } | |
285 } | |
286 | |
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287 if (CURRENT_ENV->dtrace_alloc_probes()) { |
0 | 288 assert(obj == rax, "must be"); |
289 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id))); | |
290 } | |
291 | |
292 verify_oop(obj); | |
293 } | |
294 | |
295 void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int header_size, Address::ScaleFactor f, Register klass, Label& slow_case) { | |
296 assert(obj == rax, "obj must be in rax, for cmpxchg"); | |
297 assert_different_registers(obj, len, t1, t2, klass); | |
298 | |
299 // determine alignment mask | |
304 | 300 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work"); |
0 | 301 |
302 // check for negative or excessive length | |
304 | 303 cmpptr(len, (int32_t)max_array_allocation_length); |
0 | 304 jcc(Assembler::above, slow_case); |
305 | |
306 const Register arr_size = t2; // okay to be the same | |
307 // align object end | |
304 | 308 movptr(arr_size, (int32_t)header_size * BytesPerWord + MinObjAlignmentInBytesMask); |
309 lea(arr_size, Address(arr_size, len, f)); | |
310 andptr(arr_size, ~MinObjAlignmentInBytesMask); | |
0 | 311 |
312 try_allocate(obj, arr_size, 0, t1, t2, slow_case); | |
313 | |
314 initialize_header(obj, klass, len, t1, t2); | |
315 | |
316 // clear rest of allocated space | |
317 const Register len_zero = len; | |
318 initialize_body(obj, arr_size, header_size * BytesPerWord, len_zero); | |
319 | |
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320 if (CURRENT_ENV->dtrace_alloc_probes()) { |
0 | 321 assert(obj == rax, "must be"); |
322 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id))); | |
323 } | |
324 | |
325 verify_oop(obj); | |
326 } | |
327 | |
328 | |
329 | |
330 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) { | |
331 verify_oop(receiver); | |
332 // explicit NULL check not needed since load from [klass_offset] causes a trap | |
333 // check against inline cache | |
334 assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check"); | |
335 int start_offset = offset(); | |
2002 | 336 |
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337 if (UseCompressedClassPointers) { |
2002 | 338 load_klass(rscratch1, receiver); |
339 cmpptr(rscratch1, iCache); | |
340 } else { | |
341 cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes())); | |
342 } | |
0 | 343 // if icache check fails, then jump to runtime routine |
344 // Note: RECEIVER must still contain the receiver! | |
345 jump_cc(Assembler::notEqual, | |
346 RuntimeAddress(SharedRuntime::get_ic_miss_stub())); | |
304 | 347 const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9); |
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348 assert(UseCompressedClassPointers || offset() - start_offset == ic_cmp_size, "check alignment in emit_method_entry"); |
0 | 349 } |
350 | |
351 | |
352 void C1_MacroAssembler::build_frame(int frame_size_in_bytes) { | |
353 // Make sure there is enough stack space for this method's activation. | |
354 // Note that we do this before doing an enter(). This matches the | |
355 // ordering of C2's stack overflow check / rsp decrement and allows | |
356 // the SharedRuntime stack overflow handling to be consistent | |
357 // between the two compilers. | |
358 generate_stack_overflow_check(frame_size_in_bytes); | |
359 | |
1295 | 360 push(rbp); |
0 | 361 #ifdef TIERED |
362 // c2 leaves fpu stack dirty. Clean it on entry | |
363 if (UseSSE < 2 ) { | |
364 empty_FPU_stack(); | |
365 } | |
366 #endif // TIERED | |
367 decrement(rsp, frame_size_in_bytes); // does not emit code for frame_size == 0 | |
368 } | |
369 | |
370 | |
1295 | 371 void C1_MacroAssembler::remove_frame(int frame_size_in_bytes) { |
372 increment(rsp, frame_size_in_bytes); // Does not emit code for frame_size == 0 | |
373 pop(rbp); | |
374 } | |
375 | |
376 | |
0 | 377 void C1_MacroAssembler::unverified_entry(Register receiver, Register ic_klass) { |
378 if (C1Breakpoint) int3(); | |
379 inline_cache_check(receiver, ic_klass); | |
380 } | |
381 | |
382 | |
383 void C1_MacroAssembler::verified_entry() { | |
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384 if (C1Breakpoint || VerifyFPU || !UseStackBanging) { |
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385 // Verified Entry first instruction should be 5 bytes long for correct |
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386 // patching by patch_verified_entry(). |
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387 // |
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388 // C1Breakpoint and VerifyFPU have one byte first instruction. |
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389 // Also first instruction will be one byte "push(rbp)" if stack banging |
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390 // code is not generated (see build_frame() above). |
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391 // For all these cases generate long instruction first. |
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392 fat_nop(); |
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393 } |
0 | 394 if (C1Breakpoint)int3(); |
395 // build frame | |
396 verify_FPU(0, "method_entry"); | |
397 } | |
398 | |
399 | |
400 #ifndef PRODUCT | |
401 | |
402 void C1_MacroAssembler::verify_stack_oop(int stack_offset) { | |
403 if (!VerifyOops) return; | |
404 verify_oop_addr(Address(rsp, stack_offset)); | |
405 } | |
406 | |
407 void C1_MacroAssembler::verify_not_null_oop(Register r) { | |
408 if (!VerifyOops) return; | |
409 Label not_null; | |
304 | 410 testptr(r, r); |
0 | 411 jcc(Assembler::notZero, not_null); |
412 stop("non-null oop required"); | |
413 bind(not_null); | |
414 verify_oop(r); | |
415 } | |
416 | |
417 void C1_MacroAssembler::invalidate_registers(bool inv_rax, bool inv_rbx, bool inv_rcx, bool inv_rdx, bool inv_rsi, bool inv_rdi) { | |
418 #ifdef ASSERT | |
304 | 419 if (inv_rax) movptr(rax, 0xDEAD); |
420 if (inv_rbx) movptr(rbx, 0xDEAD); | |
421 if (inv_rcx) movptr(rcx, 0xDEAD); | |
422 if (inv_rdx) movptr(rdx, 0xDEAD); | |
423 if (inv_rsi) movptr(rsi, 0xDEAD); | |
424 if (inv_rdi) movptr(rdi, 0xDEAD); | |
0 | 425 #endif |
426 } | |
427 | |
428 #endif // ifndef PRODUCT |