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 #ifdef TARGET_OS_FAMILY_bsd
41 # include "os_bsd.inline.hpp"
42 #endif
43
44
45 int VM_Version::_cpu;
46 int VM_Version::_model;
47 int VM_Version::_stepping;
48 int VM_Version::_cpuFeatures;
49 const char* VM_Version::_features_str = "";
50 VM_Version::CpuidInfo VM_Version::_cpuid_info = { 0, };
51
52 static BufferBlob* stub_blob;
53 static const int stub_size = 400;
54
55 extern "C" {
56 typedef void (*getPsrInfo_stub_t)(void*);
57 }
58 static getPsrInfo_stub_t getPsrInfo_stub = NULL;
59
60
61 class VM_Version_StubGenerator: public StubCodeGenerator {
62 public:
63
64 VM_Version_StubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {}
65
66 address generate_getPsrInfo() {
67 // Flags to test CPU type.
68 const uint32_t EFL_AC = 0x40000;
69 const uint32_t EFL_ID = 0x200000;
70 // Values for when we don't have a CPUID instruction.
71 const int CPU_FAMILY_SHIFT = 8;
72 const uint32_t CPU_FAMILY_386 = (3 << CPU_FAMILY_SHIFT);
73 const uint32_t CPU_FAMILY_486 = (4 << CPU_FAMILY_SHIFT);
74
75 Label detect_486, cpu486, detect_586, std_cpuid1, std_cpuid4;
76 Label ext_cpuid1, ext_cpuid5, done;
77
78 StubCodeMark mark(this, "VM_Version", "getPsrInfo_stub");
79 # define __ _masm->
80
81 address start = __ pc();
82
83 //
84 // void getPsrInfo(VM_Version::CpuidInfo* cpuid_info);
85 //
86 // LP64: rcx and rdx are first and second argument registers on windows
87
88 __ push(rbp);
89 #ifdef _LP64
90 __ mov(rbp, c_rarg0); // cpuid_info address
91 #else
92 __ movptr(rbp, Address(rsp, 8)); // cpuid_info address
93 #endif
94 __ push(rbx);
95 __ push(rsi);
96 __ pushf(); // preserve rbx, and flags
97 __ pop(rax);
98 __ push(rax);
99 __ mov(rcx, rax);
100 //
101 // if we are unable to change the AC flag, we have a 386
102 //
103 __ xorl(rax, EFL_AC);
104 __ push(rax);
105 __ popf();
106 __ pushf();
107 __ pop(rax);
108 __ cmpptr(rax, rcx);
109 __ jccb(Assembler::notEqual, detect_486);
110
111 __ movl(rax, CPU_FAMILY_386);
112 __ movl(Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())), rax);
113 __ jmp(done);
114
115 //
116 // If we are unable to change the ID flag, we have a 486 which does
117 // not support the "cpuid" instruction.
118 //
119 __ bind(detect_486);
120 __ mov(rax, rcx);
121 __ xorl(rax, EFL_ID);
122 __ push(rax);
123 __ popf();
124 __ pushf();
125 __ pop(rax);
126 __ cmpptr(rcx, rax);
127 __ jccb(Assembler::notEqual, detect_586);
128
129 __ bind(cpu486);
130 __ movl(rax, CPU_FAMILY_486);
131 __ movl(Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())), rax);
132 __ jmp(done);
133
134 //
135 // At this point, we have a chip which supports the "cpuid" instruction
136 //
137 __ bind(detect_586);
138 __ xorl(rax, rax);
139 __ cpuid();
140 __ orl(rax, rax);
141 __ jcc(Assembler::equal, cpu486); // if cpuid doesn't support an input
142 // value of at least 1, we give up and
143 // assume a 486
144 __ lea(rsi, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset())));
145 __ movl(Address(rsi, 0), rax);
146 __ movl(Address(rsi, 4), rbx);
147 __ movl(Address(rsi, 8), rcx);
148 __ movl(Address(rsi,12), rdx);
149
150 __ cmpl(rax, 0xa); // Is cpuid(0xB) supported?
151 __ jccb(Assembler::belowEqual, std_cpuid4);
152
153 //
154 // cpuid(0xB) Processor Topology
155 //
156 __ movl(rax, 0xb);
157 __ xorl(rcx, rcx); // Threads level
158 __ cpuid();
159
160 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB0_offset())));
161 __ movl(Address(rsi, 0), rax);
162 __ movl(Address(rsi, 4), rbx);
163 __ movl(Address(rsi, 8), rcx);
164 __ movl(Address(rsi,12), rdx);
165
166 __ movl(rax, 0xb);
167 __ movl(rcx, 1); // Cores level
168 __ cpuid();
169 __ push(rax);
170 __ andl(rax, 0x1f); // Determine if valid topology level
171 __ orl(rax, rbx); // eax[4:0] | ebx[0:15] == 0 indicates invalid level
172 __ andl(rax, 0xffff);
173 __ pop(rax);
174 __ jccb(Assembler::equal, std_cpuid4);
175
176 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB1_offset())));
177 __ movl(Address(rsi, 0), rax);
178 __ movl(Address(rsi, 4), rbx);
179 __ movl(Address(rsi, 8), rcx);
180 __ movl(Address(rsi,12), rdx);
181
182 __ movl(rax, 0xb);
183 __ movl(rcx, 2); // Packages level
184 __ cpuid();
185 __ push(rax);
186 __ andl(rax, 0x1f); // Determine if valid topology level
187 __ orl(rax, rbx); // eax[4:0] | ebx[0:15] == 0 indicates invalid level
188 __ andl(rax, 0xffff);
189 __ pop(rax);
190 __ jccb(Assembler::equal, std_cpuid4);
191
192 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB2_offset())));
193 __ movl(Address(rsi, 0), rax);
194 __ movl(Address(rsi, 4), rbx);
195 __ movl(Address(rsi, 8), rcx);
196 __ movl(Address(rsi,12), rdx);
197
198 //
199 // cpuid(0x4) Deterministic cache params
200 //
201 __ bind(std_cpuid4);
202 __ movl(rax, 4);
203 __ cmpl(rax, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset()))); // Is cpuid(0x4) supported?
204 __ jccb(Assembler::greater, std_cpuid1);
205
206 __ xorl(rcx, rcx); // L1 cache
207 __ cpuid();
208 __ push(rax);
209 __ andl(rax, 0x1f); // Determine if valid cache parameters used
210 __ orl(rax, rax); // eax[4:0] == 0 indicates invalid cache
211 __ pop(rax);
212 __ jccb(Assembler::equal, std_cpuid1);
213
214 __ lea(rsi, Address(rbp, in_bytes(VM_Version::dcp_cpuid4_offset())));
215 __ movl(Address(rsi, 0), rax);
216 __ movl(Address(rsi, 4), rbx);
217 __ movl(Address(rsi, 8), rcx);
218 __ movl(Address(rsi,12), rdx);
219
220 //
221 // Standard cpuid(0x1)
222 //
223 __ bind(std_cpuid1);
224 __ movl(rax, 1);
225 __ cpuid();
226 __ lea(rsi, Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())));
227 __ movl(Address(rsi, 0), rax);
228 __ movl(Address(rsi, 4), rbx);
229 __ movl(Address(rsi, 8), rcx);
230 __ movl(Address(rsi,12), rdx);
231
232 __ movl(rax, 0x80000000);
233 __ cpuid();
234 __ cmpl(rax, 0x80000000); // Is cpuid(0x80000001) supported?
235 __ jcc(Assembler::belowEqual, done);
236 __ cmpl(rax, 0x80000004); // Is cpuid(0x80000005) supported?
237 __ jccb(Assembler::belowEqual, ext_cpuid1);
238 __ cmpl(rax, 0x80000007); // Is cpuid(0x80000008) supported?
239 __ jccb(Assembler::belowEqual, ext_cpuid5);
240 //
241 // Extended cpuid(0x80000008)
242 //
243 __ movl(rax, 0x80000008);
244 __ cpuid();
245 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid8_offset())));
246 __ movl(Address(rsi, 0), rax);
247 __ movl(Address(rsi, 4), rbx);
248 __ movl(Address(rsi, 8), rcx);
249 __ movl(Address(rsi,12), rdx);
250
251 //
252 // Extended cpuid(0x80000005)
253 //
254 __ bind(ext_cpuid5);
255 __ movl(rax, 0x80000005);
256 __ cpuid();
257 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid5_offset())));
258 __ movl(Address(rsi, 0), rax);
259 __ movl(Address(rsi, 4), rbx);
260 __ movl(Address(rsi, 8), rcx);
261 __ movl(Address(rsi,12), rdx);
262
263 //
264 // Extended cpuid(0x80000001)
265 //
266 __ bind(ext_cpuid1);
267 __ movl(rax, 0x80000001);
268 __ cpuid();
269 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid1_offset())));
270 __ movl(Address(rsi, 0), rax);
271 __ movl(Address(rsi, 4), rbx);
272 __ movl(Address(rsi, 8), rcx);
273 __ movl(Address(rsi,12), rdx);
274
275 //
276 // return
277 //
278 __ bind(done);
279 __ popf();
280 __ pop(rsi);
281 __ pop(rbx);
282 __ pop(rbp);
283 __ ret(0);
284
285 # undef __
286
287 return start;
288 };
289 };
290
291
292 void VM_Version::get_processor_features() {
293
294 _cpu = 4; // 486 by default
295 _model = 0;
296 _stepping = 0;
297 _cpuFeatures = 0;
298 _logical_processors_per_package = 1;
299
300 if (!Use486InstrsOnly) {
301 // Get raw processor info
302 getPsrInfo_stub(&_cpuid_info);
303 assert_is_initialized();
304 _cpu = extended_cpu_family();
305 _model = extended_cpu_model();
306 _stepping = cpu_stepping();
307
308 if (cpu_family() > 4) { // it supports CPUID
309 _cpuFeatures = feature_flags();
310 // Logical processors are only available on P4s and above,
311 // and only if hyperthreading is available.
312 _logical_processors_per_package = logical_processor_count();
313 }
314 }
315
316 _supports_cx8 = supports_cmpxchg8();
317
318 #ifdef _LP64
319 // OS should support SSE for x64 and hardware should support at least SSE2.
320 if (!VM_Version::supports_sse2()) {
321 vm_exit_during_initialization("Unknown x64 processor: SSE2 not supported");
322 }
323 // in 64 bit the use of SSE2 is the minimum
324 if (UseSSE < 2) UseSSE = 2;
325 #endif
326
327 #ifdef AMD64
328 // flush_icache_stub have to be generated first.
329 // That is why Icache line size is hard coded in ICache class,
330 // see icache_x86.hpp. It is also the reason why we can't use
331 // clflush instruction in 32-bit VM since it could be running
332 // on CPU which does not support it.
333 //
334 // The only thing we can do is to verify that flushed
335 // ICache::line_size has correct value.
336 guarantee(_cpuid_info.std_cpuid1_edx.bits.clflush != 0, "clflush is not supported");
337 // clflush_size is size in quadwords (8 bytes).
338 guarantee(_cpuid_info.std_cpuid1_ebx.bits.clflush_size == 8, "such clflush size is not supported");
339 #endif
340
341 // If the OS doesn't support SSE, we can't use this feature even if the HW does
342 if (!os::supports_sse())
343 _cpuFeatures &= ~(CPU_SSE|CPU_SSE2|CPU_SSE3|CPU_SSSE3|CPU_SSE4A|CPU_SSE4_1|CPU_SSE4_2);
344
345 if (UseSSE < 4) {
346 _cpuFeatures &= ~CPU_SSE4_1;
347 _cpuFeatures &= ~CPU_SSE4_2;
348 }
349
350 if (UseSSE < 3) {
351 _cpuFeatures &= ~CPU_SSE3;
352 _cpuFeatures &= ~CPU_SSSE3;
353 _cpuFeatures &= ~CPU_SSE4A;
354 }
355
356 if (UseSSE < 2)
357 _cpuFeatures &= ~CPU_SSE2;
358
359 if (UseSSE < 1)
360 _cpuFeatures &= ~CPU_SSE;
361
362 if (logical_processors_per_package() == 1) {
363 // HT processor could be installed on a system which doesn't support HT.
364 _cpuFeatures &= ~CPU_HT;
365 }
366
367 char buf[256];
368 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",
369 cores_per_cpu(), threads_per_core(),
370 cpu_family(), _model, _stepping,
371 (supports_cmov() ? ", cmov" : ""),
372 (supports_cmpxchg8() ? ", cx8" : ""),
373 (supports_fxsr() ? ", fxsr" : ""),
374 (supports_mmx() ? ", mmx" : ""),
375 (supports_sse() ? ", sse" : ""),
376 (supports_sse2() ? ", sse2" : ""),
377 (supports_sse3() ? ", sse3" : ""),
378 (supports_ssse3()? ", ssse3": ""),
379 (supports_sse4_1() ? ", sse4.1" : ""),
380 (supports_sse4_2() ? ", sse4.2" : ""),
381 (supports_popcnt() ? ", popcnt" : ""),
382 (supports_mmx_ext() ? ", mmxext" : ""),
383 (supports_3dnow_prefetch() ? ", 3dnowpref" : ""),
384 (supports_lzcnt() ? ", lzcnt": ""),
385 (supports_sse4a() ? ", sse4a": ""),
386 (supports_ht() ? ", ht": ""));
387 _features_str = strdup(buf);
388
389 // UseSSE is set to the smaller of what hardware supports and what
390 // the command line requires. I.e., you cannot set UseSSE to 2 on
391 // older Pentiums which do not support it.
392 if( UseSSE > 4 ) UseSSE=4;
393 if( UseSSE < 0 ) UseSSE=0;
394 if( !supports_sse4_1() ) // Drop to 3 if no SSE4 support
395 UseSSE = MIN2((intx)3,UseSSE);
396 if( !supports_sse3() ) // Drop to 2 if no SSE3 support
397 UseSSE = MIN2((intx)2,UseSSE);
398 if( !supports_sse2() ) // Drop to 1 if no SSE2 support
399 UseSSE = MIN2((intx)1,UseSSE);
400 if( !supports_sse () ) // Drop to 0 if no SSE support
401 UseSSE = 0;
402
403 // On new cpus instructions which update whole XMM register should be used
404 // to prevent partial register stall due to dependencies on high half.
405 //
406 // UseXmmLoadAndClearUpper == true --> movsd(xmm, mem)
407 // UseXmmLoadAndClearUpper == false --> movlpd(xmm, mem)
408 // UseXmmRegToRegMoveAll == true --> movaps(xmm, xmm), movapd(xmm, xmm).
409 // UseXmmRegToRegMoveAll == false --> movss(xmm, xmm), movsd(xmm, xmm).
410
411 if( is_amd() ) { // AMD cpus specific settings
412 if( supports_sse2() && FLAG_IS_DEFAULT(UseAddressNop) ) {
413 // Use it on new AMD cpus starting from Opteron.
414 UseAddressNop = true;
415 }
416 if( supports_sse2() && FLAG_IS_DEFAULT(UseNewLongLShift) ) {
417 // Use it on new AMD cpus starting from Opteron.
418 UseNewLongLShift = true;
419 }
420 if( FLAG_IS_DEFAULT(UseXmmLoadAndClearUpper) ) {
421 if( supports_sse4a() ) {
422 UseXmmLoadAndClearUpper = true; // use movsd only on '10h' Opteron
423 } else {
424 UseXmmLoadAndClearUpper = false;
425 }
426 }
427 if( FLAG_IS_DEFAULT(UseXmmRegToRegMoveAll) ) {
428 if( supports_sse4a() ) {
429 UseXmmRegToRegMoveAll = true; // use movaps, movapd only on '10h'
430 } else {
431 UseXmmRegToRegMoveAll = false;
432 }
433 }
434 if( FLAG_IS_DEFAULT(UseXmmI2F) ) {
435 if( supports_sse4a() ) {
436 UseXmmI2F = true;
437 } else {
438 UseXmmI2F = false;
439 }
440 }
441 if( FLAG_IS_DEFAULT(UseXmmI2D) ) {
442 if( supports_sse4a() ) {
443 UseXmmI2D = true;
444 } else {
445 UseXmmI2D = false;
446 }
447 }
448 if( FLAG_IS_DEFAULT(UseSSE42Intrinsics) ) {
449 if( supports_sse4_2() && UseSSE >= 4 ) {
450 UseSSE42Intrinsics = true;
451 }
452 }
453
454 // Use count leading zeros count instruction if available.
455 if (supports_lzcnt()) {
456 if (FLAG_IS_DEFAULT(UseCountLeadingZerosInstruction)) {
457 UseCountLeadingZerosInstruction = true;
458 }
459 }
460
461 // some defaults for AMD family 15h
462 if ( cpu_family() == 0x15 ) {
463 // On family 15h processors default is no sw prefetch
464 if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
465 AllocatePrefetchStyle = 0;
466 }
467 // Also, if some other prefetch style is specified, default instruction type is PREFETCHW
468 if (FLAG_IS_DEFAULT(AllocatePrefetchInstr)) {
469 AllocatePrefetchInstr = 3;
470 }
471 // On family 15h processors use XMM and UnalignedLoadStores for Array Copy
472 if( FLAG_IS_DEFAULT(UseXMMForArrayCopy) ) {
473 UseXMMForArrayCopy = true;
474 }
475 if( FLAG_IS_DEFAULT(UseUnalignedLoadStores) && UseXMMForArrayCopy ) {
476 UseUnalignedLoadStores = true;
477 }
478 }
479
480 }
481
482 if( is_intel() ) { // Intel cpus specific settings
483 if( FLAG_IS_DEFAULT(UseStoreImmI16) ) {
484 UseStoreImmI16 = false; // don't use it on Intel cpus
485 }
486 if( cpu_family() == 6 || cpu_family() == 15 ) {
487 if( FLAG_IS_DEFAULT(UseAddressNop) ) {
488 // Use it on all Intel cpus starting from PentiumPro
489 UseAddressNop = true;
490 }
491 }
492 if( FLAG_IS_DEFAULT(UseXmmLoadAndClearUpper) ) {
493 UseXmmLoadAndClearUpper = true; // use movsd on all Intel cpus
494 }
495 if( FLAG_IS_DEFAULT(UseXmmRegToRegMoveAll) ) {
496 if( supports_sse3() ) {
497 UseXmmRegToRegMoveAll = true; // use movaps, movapd on new Intel cpus
498 } else {
499 UseXmmRegToRegMoveAll = false;
500 }
501 }
502 if( cpu_family() == 6 && supports_sse3() ) { // New Intel cpus
503 #ifdef COMPILER2
504 if( FLAG_IS_DEFAULT(MaxLoopPad) ) {
505 // For new Intel cpus do the next optimization:
506 // don't align the beginning of a loop if there are enough instructions
507 // left (NumberOfLoopInstrToAlign defined in c2_globals.hpp)
508 // in current fetch line (OptoLoopAlignment) or the padding
509 // is big (> MaxLoopPad).
510 // Set MaxLoopPad to 11 for new Intel cpus to reduce number of
511 // generated NOP instructions. 11 is the largest size of one
512 // address NOP instruction '0F 1F' (see Assembler::nop(i)).
513 MaxLoopPad = 11;
514 }
515 #endif // COMPILER2
516 if( FLAG_IS_DEFAULT(UseXMMForArrayCopy) ) {
517 UseXMMForArrayCopy = true; // use SSE2 movq on new Intel cpus
518 }
519 if( supports_sse4_2() && supports_ht() ) { // Newest Intel cpus
520 if( FLAG_IS_DEFAULT(UseUnalignedLoadStores) && UseXMMForArrayCopy ) {
521 UseUnalignedLoadStores = true; // use movdqu on newest Intel cpus
522 }
523 }
524 if( supports_sse4_2() && UseSSE >= 4 ) {
525 if( FLAG_IS_DEFAULT(UseSSE42Intrinsics)) {
526 UseSSE42Intrinsics = true;
527 }
528 }
529 }
530 }
531
532 // Use population count instruction if available.
533 if (supports_popcnt()) {
534 if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
535 UsePopCountInstruction = true;
536 }
537 }
538
539 #ifdef COMPILER2
540 if (UseFPUForSpilling) {
541 if (UseSSE < 2) {
542 // Only supported with SSE2+
543 FLAG_SET_DEFAULT(UseFPUForSpilling, false);
544 }
545 }
546 #endif
547
548 assert(0 <= ReadPrefetchInstr && ReadPrefetchInstr <= 3, "invalid value");
549 assert(0 <= AllocatePrefetchInstr && AllocatePrefetchInstr <= 3, "invalid value");
550
551 // set valid Prefetch instruction
552 if( ReadPrefetchInstr < 0 ) ReadPrefetchInstr = 0;
553 if( ReadPrefetchInstr > 3 ) ReadPrefetchInstr = 3;
554 if( ReadPrefetchInstr == 3 && !supports_3dnow_prefetch() ) ReadPrefetchInstr = 0;
555 if( !supports_sse() && supports_3dnow_prefetch() ) ReadPrefetchInstr = 3;
556
557 if( AllocatePrefetchInstr < 0 ) AllocatePrefetchInstr = 0;
558 if( AllocatePrefetchInstr > 3 ) AllocatePrefetchInstr = 3;
559 if( AllocatePrefetchInstr == 3 && !supports_3dnow_prefetch() ) AllocatePrefetchInstr=0;
560 if( !supports_sse() && supports_3dnow_prefetch() ) AllocatePrefetchInstr = 3;
561
562 // Allocation prefetch settings
563 intx cache_line_size = prefetch_data_size();
564 if( cache_line_size > AllocatePrefetchStepSize )
565 AllocatePrefetchStepSize = cache_line_size;
566
567 assert(AllocatePrefetchLines > 0, "invalid value");
568 if( AllocatePrefetchLines < 1 ) // set valid value in product VM
569 AllocatePrefetchLines = 3;
570 assert(AllocateInstancePrefetchLines > 0, "invalid value");
571 if( AllocateInstancePrefetchLines < 1 ) // set valid value in product VM
572 AllocateInstancePrefetchLines = 1;
573
574 AllocatePrefetchDistance = allocate_prefetch_distance();
575 AllocatePrefetchStyle = allocate_prefetch_style();
576
577 if( is_intel() && cpu_family() == 6 && supports_sse3() ) {
578 if( AllocatePrefetchStyle == 2 ) { // watermark prefetching on Core
579 #ifdef _LP64
580 AllocatePrefetchDistance = 384;
581 #else
582 AllocatePrefetchDistance = 320;
583 #endif
584 }
585 if( supports_sse4_2() && supports_ht() ) { // Nehalem based cpus
586 AllocatePrefetchDistance = 192;
587 AllocatePrefetchLines = 4;
588 #ifdef COMPILER2
589 if (AggressiveOpts && FLAG_IS_DEFAULT(UseFPUForSpilling)) {
590 FLAG_SET_DEFAULT(UseFPUForSpilling, true);
591 }
592 #endif
593 }
594 }
595 assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");
596
597 #ifdef _LP64
598 // Prefetch settings
599 PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
600 PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
601 PrefetchFieldsAhead = prefetch_fields_ahead();
602 #endif
603
604 #ifndef PRODUCT
605 if (PrintMiscellaneous && Verbose) {
606 tty->print_cr("Logical CPUs per core: %u",
607 logical_processors_per_package());
608 tty->print_cr("UseSSE=%d",UseSSE);
609 tty->print("Allocation");
610 if (AllocatePrefetchStyle <= 0 || UseSSE == 0 && !supports_3dnow_prefetch()) {
611 tty->print_cr(": no prefetching");
612 } else {
613 tty->print(" prefetching: ");
614 if (UseSSE == 0 && supports_3dnow_prefetch()) {
615 tty->print("PREFETCHW");
616 } else if (UseSSE >= 1) {
617 if (AllocatePrefetchInstr == 0) {
618 tty->print("PREFETCHNTA");
619 } else if (AllocatePrefetchInstr == 1) {
620 tty->print("PREFETCHT0");
621 } else if (AllocatePrefetchInstr == 2) {
622 tty->print("PREFETCHT2");
623 } else if (AllocatePrefetchInstr == 3) {
624 tty->print("PREFETCHW");
625 }
626 }
627 if (AllocatePrefetchLines > 1) {
628 tty->print_cr(" at distance %d, %d lines of %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
629 } else {
630 tty->print_cr(" at distance %d, one line of %d bytes", AllocatePrefetchDistance, AllocatePrefetchStepSize);
631 }
632 }
633
634 if (PrefetchCopyIntervalInBytes > 0) {
635 tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes);
636 }
637 if (PrefetchScanIntervalInBytes > 0) {
638 tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes);
639 }
640 if (PrefetchFieldsAhead > 0) {
641 tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);
642 }
643 }
644 #endif // !PRODUCT
645 }
646
647 void VM_Version::initialize() {
648 ResourceMark rm;
649 // Making this stub must be FIRST use of assembler
650
651 stub_blob = BufferBlob::create("getPsrInfo_stub", stub_size);
652 if (stub_blob == NULL) {
653 vm_exit_during_initialization("Unable to allocate getPsrInfo_stub");
654 }
655 CodeBuffer c(stub_blob);
656 VM_Version_StubGenerator g(&c);
657 getPsrInfo_stub = CAST_TO_FN_PTR(getPsrInfo_stub_t,
658 g.generate_getPsrInfo());
659
660 get_processor_features();
661 }