1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All Rights Reserved.
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "assembler_x86.inline.hpp"
27 #include "memory/resourceArea.hpp"
28 #include "runtime/java.hpp"
29 #include "runtime/stubCodeGenerator.hpp"
30 #include "vm_version_x86.hpp"
31 #ifdef TARGET_OS_FAMILY_linux
32 # include "os_linux.inline.hpp"
33 #endif
34 #ifdef TARGET_OS_FAMILY_solaris
35 # include "os_solaris.inline.hpp"
36 #endif
37 #ifdef TARGET_OS_FAMILY_windows
38 # include "os_windows.inline.hpp"
39 #endif
40
41
42 int VM_Version::_cpu;
43 int VM_Version::_model;
44 int VM_Version::_stepping;
45 int VM_Version::_cpuFeatures;
46 const char* VM_Version::_features_str = "";
47 VM_Version::CpuidInfo VM_Version::_cpuid_info = { 0, };
48
49 static BufferBlob* stub_blob;
50 static const int stub_size = 400;
51
52 extern "C" {
53 typedef void (*getPsrInfo_stub_t)(void*);
54 }
55 static getPsrInfo_stub_t getPsrInfo_stub = NULL;
56
57
58 class VM_Version_StubGenerator: public StubCodeGenerator {
59 public:
60
61 VM_Version_StubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {}
62
63 address generate_getPsrInfo() {
64 // Flags to test CPU type.
65 const uint32_t EFL_AC = 0x40000;
66 const uint32_t EFL_ID = 0x200000;
67 // Values for when we don't have a CPUID instruction.
68 const int CPU_FAMILY_SHIFT = 8;
69 const uint32_t CPU_FAMILY_386 = (3 << CPU_FAMILY_SHIFT);
70 const uint32_t CPU_FAMILY_486 = (4 << CPU_FAMILY_SHIFT);
71
72 Label detect_486, cpu486, detect_586, std_cpuid1, std_cpuid4;
73 Label ext_cpuid1, ext_cpuid5, done;
74
75 StubCodeMark mark(this, "VM_Version", "getPsrInfo_stub");
76 # define __ _masm->
77
78 address start = __ pc();
79
80 //
81 // void getPsrInfo(VM_Version::CpuidInfo* cpuid_info);
82 //
83 // LP64: rcx and rdx are first and second argument registers on windows
84
85 __ push(rbp);
86 #ifdef _LP64
87 __ mov(rbp, c_rarg0); // cpuid_info address
88 #else
89 __ movptr(rbp, Address(rsp, 8)); // cpuid_info address
90 #endif
91 __ push(rbx);
92 __ push(rsi);
93 __ pushf(); // preserve rbx, and flags
94 __ pop(rax);
95 __ push(rax);
96 __ mov(rcx, rax);
97 //
98 // if we are unable to change the AC flag, we have a 386
99 //
100 __ xorl(rax, EFL_AC);
101 __ push(rax);
102 __ popf();
103 __ pushf();
104 __ pop(rax);
105 __ cmpptr(rax, rcx);
106 __ jccb(Assembler::notEqual, detect_486);
107
108 __ movl(rax, CPU_FAMILY_386);
109 __ movl(Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())), rax);
110 __ jmp(done);
111
112 //
113 // If we are unable to change the ID flag, we have a 486 which does
114 // not support the "cpuid" instruction.
115 //
116 __ bind(detect_486);
117 __ mov(rax, rcx);
118 __ xorl(rax, EFL_ID);
119 __ push(rax);
120 __ popf();
121 __ pushf();
122 __ pop(rax);
123 __ cmpptr(rcx, rax);
124 __ jccb(Assembler::notEqual, detect_586);
125
126 __ bind(cpu486);
127 __ movl(rax, CPU_FAMILY_486);
128 __ movl(Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())), rax);
129 __ jmp(done);
130
131 //
132 // At this point, we have a chip which supports the "cpuid" instruction
133 //
134 __ bind(detect_586);
135 __ xorl(rax, rax);
136 __ cpuid();
137 __ orl(rax, rax);
138 __ jcc(Assembler::equal, cpu486); // if cpuid doesn't support an input
139 // value of at least 1, we give up and
140 // assume a 486
141 __ lea(rsi, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset())));
142 __ movl(Address(rsi, 0), rax);
143 __ movl(Address(rsi, 4), rbx);
144 __ movl(Address(rsi, 8), rcx);
145 __ movl(Address(rsi,12), rdx);
146
147 __ cmpl(rax, 0xa); // Is cpuid(0xB) supported?
148 __ jccb(Assembler::belowEqual, std_cpuid4);
149
150 //
151 // cpuid(0xB) Processor Topology
152 //
153 __ movl(rax, 0xb);
154 __ xorl(rcx, rcx); // Threads level
155 __ cpuid();
156
157 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB0_offset())));
158 __ movl(Address(rsi, 0), rax);
159 __ movl(Address(rsi, 4), rbx);
160 __ movl(Address(rsi, 8), rcx);
161 __ movl(Address(rsi,12), rdx);
162
163 __ movl(rax, 0xb);
164 __ movl(rcx, 1); // Cores level
165 __ cpuid();
166 __ push(rax);
167 __ andl(rax, 0x1f); // Determine if valid topology level
168 __ orl(rax, rbx); // eax[4:0] | ebx[0:15] == 0 indicates invalid level
169 __ andl(rax, 0xffff);
170 __ pop(rax);
171 __ jccb(Assembler::equal, std_cpuid4);
172
173 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB1_offset())));
174 __ movl(Address(rsi, 0), rax);
175 __ movl(Address(rsi, 4), rbx);
176 __ movl(Address(rsi, 8), rcx);
177 __ movl(Address(rsi,12), rdx);
178
179 __ movl(rax, 0xb);
180 __ movl(rcx, 2); // Packages level
181 __ cpuid();
182 __ push(rax);
183 __ andl(rax, 0x1f); // Determine if valid topology level
184 __ orl(rax, rbx); // eax[4:0] | ebx[0:15] == 0 indicates invalid level
185 __ andl(rax, 0xffff);
186 __ pop(rax);
187 __ jccb(Assembler::equal, std_cpuid4);
188
189 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB2_offset())));
190 __ movl(Address(rsi, 0), rax);
191 __ movl(Address(rsi, 4), rbx);
192 __ movl(Address(rsi, 8), rcx);
193 __ movl(Address(rsi,12), rdx);
194
195 //
196 // cpuid(0x4) Deterministic cache params
197 //
198 __ bind(std_cpuid4);
199 __ movl(rax, 4);
200 __ cmpl(rax, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset()))); // Is cpuid(0x4) supported?
201 __ jccb(Assembler::greater, std_cpuid1);
202
203 __ xorl(rcx, rcx); // L1 cache
204 __ cpuid();
205 __ push(rax);
206 __ andl(rax, 0x1f); // Determine if valid cache parameters used
207 __ orl(rax, rax); // eax[4:0] == 0 indicates invalid cache
208 __ pop(rax);
209 __ jccb(Assembler::equal, std_cpuid1);
210
211 __ lea(rsi, Address(rbp, in_bytes(VM_Version::dcp_cpuid4_offset())));
212 __ movl(Address(rsi, 0), rax);
213 __ movl(Address(rsi, 4), rbx);
214 __ movl(Address(rsi, 8), rcx);
215 __ movl(Address(rsi,12), rdx);
216
217 //
218 // Standard cpuid(0x1)
219 //
220 __ bind(std_cpuid1);
221 __ movl(rax, 1);
222 __ cpuid();
223 __ lea(rsi, Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())));
224 __ movl(Address(rsi, 0), rax);
225 __ movl(Address(rsi, 4), rbx);
226 __ movl(Address(rsi, 8), rcx);
227 __ movl(Address(rsi,12), rdx);
228
229 __ movl(rax, 0x80000000);
230 __ cpuid();
231 __ cmpl(rax, 0x80000000); // Is cpuid(0x80000001) supported?
232 __ jcc(Assembler::belowEqual, done);
233 __ cmpl(rax, 0x80000004); // Is cpuid(0x80000005) supported?
234 __ jccb(Assembler::belowEqual, ext_cpuid1);
235 __ cmpl(rax, 0x80000007); // Is cpuid(0x80000008) supported?
236 __ jccb(Assembler::belowEqual, ext_cpuid5);
237 //
238 // Extended cpuid(0x80000008)
239 //
240 __ movl(rax, 0x80000008);
241 __ cpuid();
242 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid8_offset())));
243 __ movl(Address(rsi, 0), rax);
244 __ movl(Address(rsi, 4), rbx);
245 __ movl(Address(rsi, 8), rcx);
246 __ movl(Address(rsi,12), rdx);
247
248 //
249 // Extended cpuid(0x80000005)
250 //
251 __ bind(ext_cpuid5);
252 __ movl(rax, 0x80000005);
253 __ cpuid();
254 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid5_offset())));
255 __ movl(Address(rsi, 0), rax);
256 __ movl(Address(rsi, 4), rbx);
257 __ movl(Address(rsi, 8), rcx);
258 __ movl(Address(rsi,12), rdx);
259
260 //
261 // Extended cpuid(0x80000001)
262 //
263 __ bind(ext_cpuid1);
264 __ movl(rax, 0x80000001);
265 __ cpuid();
266 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid1_offset())));
267 __ movl(Address(rsi, 0), rax);
268 __ movl(Address(rsi, 4), rbx);
269 __ movl(Address(rsi, 8), rcx);
270 __ movl(Address(rsi,12), rdx);
271
272 //
273 // return
274 //
275 __ bind(done);
276 __ popf();
277 __ pop(rsi);
278 __ pop(rbx);
279 __ pop(rbp);
280 __ ret(0);
281
282 # undef __
283
284 return start;
285 };
286 };
287
288
289 void VM_Version::get_processor_features() {
290
291 _cpu = 4; // 486 by default
292 _model = 0;
293 _stepping = 0;
294 _cpuFeatures = 0;
295 _logical_processors_per_package = 1;
296
297 if (!Use486InstrsOnly) {
298 // Get raw processor info
299 getPsrInfo_stub(&_cpuid_info);
300 assert_is_initialized();
301 _cpu = extended_cpu_family();
302 _model = extended_cpu_model();
303 _stepping = cpu_stepping();
304
305 if (cpu_family() > 4) { // it supports CPUID
306 _cpuFeatures = feature_flags();
307 // Logical processors are only available on P4s and above,
308 // and only if hyperthreading is available.
309 _logical_processors_per_package = logical_processor_count();
310 }
311 }
312
313 _supports_cx8 = supports_cmpxchg8();
314
315 #ifdef _LP64
316 // OS should support SSE for x64 and hardware should support at least SSE2.
317 if (!VM_Version::supports_sse2()) {
318 vm_exit_during_initialization("Unknown x64 processor: SSE2 not supported");
319 }
320 // in 64 bit the use of SSE2 is the minimum
321 if (UseSSE < 2) UseSSE = 2;
322 #endif
323
324 #ifdef AMD64
325 // flush_icache_stub have to be generated first.
326 // That is why Icache line size is hard coded in ICache class,
327 // see icache_x86.hpp. It is also the reason why we can't use
328 // clflush instruction in 32-bit VM since it could be running
329 // on CPU which does not support it.
330 //
331 // The only thing we can do is to verify that flushed
332 // ICache::line_size has correct value.
333 guarantee(_cpuid_info.std_cpuid1_edx.bits.clflush != 0, "clflush is not supported");
334 // clflush_size is size in quadwords (8 bytes).
335 guarantee(_cpuid_info.std_cpuid1_ebx.bits.clflush_size == 8, "such clflush size is not supported");
336 #endif
337
338 // If the OS doesn't support SSE, we can't use this feature even if the HW does
339 if (!os::supports_sse())
340 _cpuFeatures &= ~(CPU_SSE|CPU_SSE2|CPU_SSE3|CPU_SSSE3|CPU_SSE4A|CPU_SSE4_1|CPU_SSE4_2);
341
342 if (UseSSE < 4) {
343 _cpuFeatures &= ~CPU_SSE4_1;
344 _cpuFeatures &= ~CPU_SSE4_2;
345 }
346
347 if (UseSSE < 3) {
348 _cpuFeatures &= ~CPU_SSE3;
349 _cpuFeatures &= ~CPU_SSSE3;
350 _cpuFeatures &= ~CPU_SSE4A;
351 }
352
353 if (UseSSE < 2)
354 _cpuFeatures &= ~CPU_SSE2;
355
356 if (UseSSE < 1)
357 _cpuFeatures &= ~CPU_SSE;
358
359 if (logical_processors_per_package() == 1) {
360 // HT processor could be installed on a system which doesn't support HT.
361 _cpuFeatures &= ~CPU_HT;
362 }
363
364 char buf[256];
365 jio_snprintf(buf, sizeof(buf), "(%u cores per cpu, %u threads per core) family %d model %d stepping %d%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
366 cores_per_cpu(), threads_per_core(),
367 cpu_family(), _model, _stepping,
368 (supports_cmov() ? ", cmov" : ""),
369 (supports_cmpxchg8() ? ", cx8" : ""),
370 (supports_fxsr() ? ", fxsr" : ""),
371 (supports_mmx() ? ", mmx" : ""),
372 (supports_sse() ? ", sse" : ""),
373 (supports_sse2() ? ", sse2" : ""),
374 (supports_sse3() ? ", sse3" : ""),
375 (supports_ssse3()? ", ssse3": ""),
376 (supports_sse4_1() ? ", sse4.1" : ""),
377 (supports_sse4_2() ? ", sse4.2" : ""),
378 (supports_popcnt() ? ", popcnt" : ""),
379 (supports_mmx_ext() ? ", mmxext" : ""),
380 (supports_3dnow_prefetch() ? ", 3dnowpref" : ""),
381 (supports_lzcnt() ? ", lzcnt": ""),
382 (supports_sse4a() ? ", sse4a": ""),
383 (supports_ht() ? ", ht": ""));
384 _features_str = strdup(buf);
385
386 // UseSSE is set to the smaller of what hardware supports and what
387 // the command line requires. I.e., you cannot set UseSSE to 2 on
388 // older Pentiums which do not support it.
389 if( UseSSE > 4 ) UseSSE=4;
390 if( UseSSE < 0 ) UseSSE=0;
391 if( !supports_sse4_1() ) // Drop to 3 if no SSE4 support
392 UseSSE = MIN2((intx)3,UseSSE);
393 if( !supports_sse3() ) // Drop to 2 if no SSE3 support
394 UseSSE = MIN2((intx)2,UseSSE);
395 if( !supports_sse2() ) // Drop to 1 if no SSE2 support
396 UseSSE = MIN2((intx)1,UseSSE);
397 if( !supports_sse () ) // Drop to 0 if no SSE support
398 UseSSE = 0;
399
400 // On new cpus instructions which update whole XMM register should be used
401 // to prevent partial register stall due to dependencies on high half.
402 //
403 // UseXmmLoadAndClearUpper == true --> movsd(xmm, mem)
404 // UseXmmLoadAndClearUpper == false --> movlpd(xmm, mem)
405 // UseXmmRegToRegMoveAll == true --> movaps(xmm, xmm), movapd(xmm, xmm).
406 // UseXmmRegToRegMoveAll == false --> movss(xmm, xmm), movsd(xmm, xmm).
407
408 if( is_amd() ) { // AMD cpus specific settings
409 if( supports_sse2() && FLAG_IS_DEFAULT(UseAddressNop) ) {
410 // Use it on new AMD cpus starting from Opteron.
411 UseAddressNop = true;
412 }
413 if( supports_sse2() && FLAG_IS_DEFAULT(UseNewLongLShift) ) {
414 // Use it on new AMD cpus starting from Opteron.
415 UseNewLongLShift = true;
416 }
417 if( FLAG_IS_DEFAULT(UseXmmLoadAndClearUpper) ) {
418 if( supports_sse4a() ) {
419 UseXmmLoadAndClearUpper = true; // use movsd only on '10h' Opteron
420 } else {
421 UseXmmLoadAndClearUpper = false;
422 }
423 }
424 if( FLAG_IS_DEFAULT(UseXmmRegToRegMoveAll) ) {
425 if( supports_sse4a() ) {
426 UseXmmRegToRegMoveAll = true; // use movaps, movapd only on '10h'
427 } else {
428 UseXmmRegToRegMoveAll = false;
429 }
430 }
431 if( FLAG_IS_DEFAULT(UseXmmI2F) ) {
432 if( supports_sse4a() ) {
433 UseXmmI2F = true;
434 } else {
435 UseXmmI2F = false;
436 }
437 }
438 if( FLAG_IS_DEFAULT(UseXmmI2D) ) {
439 if( supports_sse4a() ) {
440 UseXmmI2D = true;
441 } else {
442 UseXmmI2D = false;
443 }
444 }
445 if( FLAG_IS_DEFAULT(UseSSE42Intrinsics) ) {
446 if( supports_sse4_2() && UseSSE >= 4 ) {
447 UseSSE42Intrinsics = true;
448 }
449 }
450
451 // Use count leading zeros count instruction if available.
452 if (supports_lzcnt()) {
453 if (FLAG_IS_DEFAULT(UseCountLeadingZerosInstruction)) {
454 UseCountLeadingZerosInstruction = true;
455 }
456 }
457
458 // some defaults for AMD family 15h
459 if ( cpu_family() == 0x15 ) {
460 // On family 15h processors default is no sw prefetch
461 if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
462 AllocatePrefetchStyle = 0;
463 }
464 // Also, if some other prefetch style is specified, default instruction type is PREFETCHW
465 if (FLAG_IS_DEFAULT(AllocatePrefetchInstr)) {
466 AllocatePrefetchInstr = 3;
467 }
468 // On family 15h processors use XMM and UnalignedLoadStores for Array Copy
469 if( FLAG_IS_DEFAULT(UseXMMForArrayCopy) ) {
470 UseXMMForArrayCopy = true;
471 }
472 if( FLAG_IS_DEFAULT(UseUnalignedLoadStores) && UseXMMForArrayCopy ) {
473 UseUnalignedLoadStores = true;
474 }
475 }
476
477 }
478
479 if( is_intel() ) { // Intel cpus specific settings
480 if( FLAG_IS_DEFAULT(UseStoreImmI16) ) {
481 UseStoreImmI16 = false; // don't use it on Intel cpus
482 }
483 if( cpu_family() == 6 || cpu_family() == 15 ) {
484 if( FLAG_IS_DEFAULT(UseAddressNop) ) {
485 // Use it on all Intel cpus starting from PentiumPro
486 UseAddressNop = true;
487 }
488 }
489 if( FLAG_IS_DEFAULT(UseXmmLoadAndClearUpper) ) {
490 UseXmmLoadAndClearUpper = true; // use movsd on all Intel cpus
491 }
492 if( FLAG_IS_DEFAULT(UseXmmRegToRegMoveAll) ) {
493 if( supports_sse3() ) {
494 UseXmmRegToRegMoveAll = true; // use movaps, movapd on new Intel cpus
495 } else {
496 UseXmmRegToRegMoveAll = false;
497 }
498 }
499 if( cpu_family() == 6 && supports_sse3() ) { // New Intel cpus
500 #ifdef COMPILER2
501 if( FLAG_IS_DEFAULT(MaxLoopPad) ) {
502 // For new Intel cpus do the next optimization:
503 // don't align the beginning of a loop if there are enough instructions
504 // left (NumberOfLoopInstrToAlign defined in c2_globals.hpp)
505 // in current fetch line (OptoLoopAlignment) or the padding
506 // is big (> MaxLoopPad).
507 // Set MaxLoopPad to 11 for new Intel cpus to reduce number of
508 // generated NOP instructions. 11 is the largest size of one
509 // address NOP instruction '0F 1F' (see Assembler::nop(i)).
510 MaxLoopPad = 11;
511 }
512 #endif // COMPILER2
513 if( FLAG_IS_DEFAULT(UseXMMForArrayCopy) ) {
514 UseXMMForArrayCopy = true; // use SSE2 movq on new Intel cpus
515 }
516 if( supports_sse4_2() && supports_ht() ) { // Newest Intel cpus
517 if( FLAG_IS_DEFAULT(UseUnalignedLoadStores) && UseXMMForArrayCopy ) {
518 UseUnalignedLoadStores = true; // use movdqu on newest Intel cpus
519 }
520 }
521 if( supports_sse4_2() && UseSSE >= 4 ) {
522 if( FLAG_IS_DEFAULT(UseSSE42Intrinsics)) {
523 UseSSE42Intrinsics = true;
524 }
525 }
526 }
527 }
528
529 // Use population count instruction if available.
530 if (supports_popcnt()) {
531 if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
532 UsePopCountInstruction = true;
533 }
534 }
535
536 #ifdef COMPILER2
537 if (UseFPUForSpilling) {
538 if (UseSSE < 2) {
539 // Only supported with SSE2+
540 FLAG_SET_DEFAULT(UseFPUForSpilling, false);
541 }
542 }
543 #endif
544
545 assert(0 <= ReadPrefetchInstr && ReadPrefetchInstr <= 3, "invalid value");
546 assert(0 <= AllocatePrefetchInstr && AllocatePrefetchInstr <= 3, "invalid value");
547
548 // set valid Prefetch instruction
549 if( ReadPrefetchInstr < 0 ) ReadPrefetchInstr = 0;
550 if( ReadPrefetchInstr > 3 ) ReadPrefetchInstr = 3;
551 if( ReadPrefetchInstr == 3 && !supports_3dnow_prefetch() ) ReadPrefetchInstr = 0;
552 if( !supports_sse() && supports_3dnow_prefetch() ) ReadPrefetchInstr = 3;
553
554 if( AllocatePrefetchInstr < 0 ) AllocatePrefetchInstr = 0;
555 if( AllocatePrefetchInstr > 3 ) AllocatePrefetchInstr = 3;
556 if( AllocatePrefetchInstr == 3 && !supports_3dnow_prefetch() ) AllocatePrefetchInstr=0;
557 if( !supports_sse() && supports_3dnow_prefetch() ) AllocatePrefetchInstr = 3;
558
559 // Allocation prefetch settings
560 intx cache_line_size = prefetch_data_size();
561 if( cache_line_size > AllocatePrefetchStepSize )
562 AllocatePrefetchStepSize = cache_line_size;
563
564 assert(AllocatePrefetchLines > 0, "invalid value");
565 if( AllocatePrefetchLines < 1 ) // set valid value in product VM
566 AllocatePrefetchLines = 3;
567 assert(AllocateInstancePrefetchLines > 0, "invalid value");
568 if( AllocateInstancePrefetchLines < 1 ) // set valid value in product VM
569 AllocateInstancePrefetchLines = 1;
570
571 AllocatePrefetchDistance = allocate_prefetch_distance();
572 AllocatePrefetchStyle = allocate_prefetch_style();
573
574 if( is_intel() && cpu_family() == 6 && supports_sse3() ) {
575 if( AllocatePrefetchStyle == 2 ) { // watermark prefetching on Core
576 #ifdef _LP64
577 AllocatePrefetchDistance = 384;
578 #else
579 AllocatePrefetchDistance = 320;
580 #endif
581 }
582 if( supports_sse4_2() && supports_ht() ) { // Nehalem based cpus
583 AllocatePrefetchDistance = 192;
584 AllocatePrefetchLines = 4;
585 #ifdef COMPILER2
586 if (AggressiveOpts && FLAG_IS_DEFAULT(UseFPUForSpilling)) {
587 FLAG_SET_DEFAULT(UseFPUForSpilling, true);
588 }
589 #endif
590 }
591 }
592 assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");
593
594 #ifdef _LP64
595 // Prefetch settings
596 PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
597 PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
598 PrefetchFieldsAhead = prefetch_fields_ahead();
599 #endif
600
601 #ifndef PRODUCT
602 if (PrintMiscellaneous && Verbose) {
603 tty->print_cr("Logical CPUs per core: %u",
604 logical_processors_per_package());
605 tty->print_cr("UseSSE=%d",UseSSE);
606 tty->print("Allocation");
607 if (AllocatePrefetchStyle <= 0 || UseSSE == 0 && !supports_3dnow_prefetch()) {
608 tty->print_cr(": no prefetching");
609 } else {
610 tty->print(" prefetching: ");
611 if (UseSSE == 0 && supports_3dnow_prefetch()) {
612 tty->print("PREFETCHW");
613 } else if (UseSSE >= 1) {
614 if (AllocatePrefetchInstr == 0) {
615 tty->print("PREFETCHNTA");
616 } else if (AllocatePrefetchInstr == 1) {
617 tty->print("PREFETCHT0");
618 } else if (AllocatePrefetchInstr == 2) {
619 tty->print("PREFETCHT2");
620 } else if (AllocatePrefetchInstr == 3) {
621 tty->print("PREFETCHW");
622 }
623 }
624 if (AllocatePrefetchLines > 1) {
625 tty->print_cr(" at distance %d, %d lines of %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
626 } else {
627 tty->print_cr(" at distance %d, one line of %d bytes", AllocatePrefetchDistance, AllocatePrefetchStepSize);
628 }
629 }
630
631 if (PrefetchCopyIntervalInBytes > 0) {
632 tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes);
633 }
634 if (PrefetchScanIntervalInBytes > 0) {
635 tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes);
636 }
637 if (PrefetchFieldsAhead > 0) {
638 tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);
639 }
640 }
641 #endif // !PRODUCT
642 }
643
644 void VM_Version::initialize() {
645 ResourceMark rm;
646 // Making this stub must be FIRST use of assembler
647
648 stub_blob = BufferBlob::create("getPsrInfo_stub", stub_size);
649 if (stub_blob == NULL) {
650 vm_exit_during_initialization("Unable to allocate getPsrInfo_stub");
651 }
652 CodeBuffer c(stub_blob);
653 VM_Version_StubGenerator g(&c);
654 getPsrInfo_stub = CAST_TO_FN_PTR(getPsrInfo_stub_t,
655 g.generate_getPsrInfo());
656
657 get_processor_features();
658 }