Mercurial > jdk8-mips64-public > hotspot / file revision
src/cpu/x86/vm/vm_version_x86.cpp@8b46b0196eb0
src/cpu/x86/vm/vm_version_x86.cpp
Fri, 25 Jan 2013 10:04:08 -0500
- author
- zgu
- date
- Fri, 25 Jan 2013 10:04:08 -0500
- changeset 4492
- 8b46b0196eb0
- parent 4435
- 92d4b5d8dde4
- child 4480
- 522c328b8b77
- permissions
- -rw-r--r--
8000692: Remove old KERNEL code
Summary: Removed depreciated kernel VM source code from hotspot VM
Reviewed-by: dholmes, acorn
1 /*
2 * Copyright (c) 1997, 2012, 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 */
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "memory/resourceArea.hpp"
29 #include "runtime/java.hpp"
30 #include "runtime/stubCodeGenerator.hpp"
31 #include "vm_version_x86.hpp"
32 #ifdef TARGET_OS_FAMILY_linux
33 # include "os_linux.inline.hpp"
34 #endif
35 #ifdef TARGET_OS_FAMILY_solaris
36 # include "os_solaris.inline.hpp"
37 #endif
38 #ifdef TARGET_OS_FAMILY_windows
39 # include "os_windows.inline.hpp"
40 #endif
41 #ifdef TARGET_OS_FAMILY_bsd
42 # include "os_bsd.inline.hpp"
43 #endif
46 int VM_Version::_cpu;
47 int VM_Version::_model;
48 int VM_Version::_stepping;
49 int VM_Version::_cpuFeatures;
50 const char* VM_Version::_features_str = "";
51 VM_Version::CpuidInfo VM_Version::_cpuid_info = { 0, };
53 static BufferBlob* stub_blob;
54 static const int stub_size = 550;
56 extern "C" {
57 typedef void (*getPsrInfo_stub_t)(void*);
58 }
59 static getPsrInfo_stub_t getPsrInfo_stub = NULL;
62 class VM_Version_StubGenerator: public StubCodeGenerator {
63 public:
65 VM_Version_StubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {}
67 address generate_getPsrInfo() {
68 // Flags to test CPU type.
69 const uint32_t HS_EFL_AC = 0x40000;
70 const uint32_t HS_EFL_ID = 0x200000;
71 // Values for when we don't have a CPUID instruction.
72 const int CPU_FAMILY_SHIFT = 8;
73 const uint32_t CPU_FAMILY_386 = (3 << CPU_FAMILY_SHIFT);
74 const uint32_t CPU_FAMILY_486 = (4 << CPU_FAMILY_SHIFT);
76 Label detect_486, cpu486, detect_586, std_cpuid1, std_cpuid4;
77 Label sef_cpuid, ext_cpuid, ext_cpuid1, ext_cpuid5, ext_cpuid7, done;
79 StubCodeMark mark(this, "VM_Version", "getPsrInfo_stub");
80 # define __ _masm->
82 address start = __ pc();
84 //
85 // void getPsrInfo(VM_Version::CpuidInfo* cpuid_info);
86 //
87 // LP64: rcx and rdx are first and second argument registers on windows
89 __ push(rbp);
90 #ifdef _LP64
91 __ mov(rbp, c_rarg0); // cpuid_info address
92 #else
93 __ movptr(rbp, Address(rsp, 8)); // cpuid_info address
94 #endif
95 __ push(rbx);
96 __ push(rsi);
97 __ pushf(); // preserve rbx, and flags
98 __ pop(rax);
99 __ push(rax);
100 __ mov(rcx, rax);
101 //
102 // if we are unable to change the AC flag, we have a 386
103 //
104 __ xorl(rax, HS_EFL_AC);
105 __ push(rax);
106 __ popf();
107 __ pushf();
108 __ pop(rax);
109 __ cmpptr(rax, rcx);
110 __ jccb(Assembler::notEqual, detect_486);
112 __ movl(rax, CPU_FAMILY_386);
113 __ movl(Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())), rax);
114 __ jmp(done);
116 //
117 // If we are unable to change the ID flag, we have a 486 which does
118 // not support the "cpuid" instruction.
119 //
120 __ bind(detect_486);
121 __ mov(rax, rcx);
122 __ xorl(rax, HS_EFL_ID);
123 __ push(rax);
124 __ popf();
125 __ pushf();
126 __ pop(rax);
127 __ cmpptr(rcx, rax);
128 __ jccb(Assembler::notEqual, detect_586);
130 __ bind(cpu486);
131 __ movl(rax, CPU_FAMILY_486);
132 __ movl(Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())), rax);
133 __ jmp(done);
135 //
136 // At this point, we have a chip which supports the "cpuid" instruction
137 //
138 __ bind(detect_586);
139 __ xorl(rax, rax);
140 __ cpuid();
141 __ orl(rax, rax);
142 __ jcc(Assembler::equal, cpu486); // if cpuid doesn't support an input
143 // value of at least 1, we give up and
144 // assume a 486
145 __ lea(rsi, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset())));
146 __ movl(Address(rsi, 0), rax);
147 __ movl(Address(rsi, 4), rbx);
148 __ movl(Address(rsi, 8), rcx);
149 __ movl(Address(rsi,12), rdx);
151 __ cmpl(rax, 0xa); // Is cpuid(0xB) supported?
152 __ jccb(Assembler::belowEqual, std_cpuid4);
154 //
155 // cpuid(0xB) Processor Topology
156 //
157 __ movl(rax, 0xb);
158 __ xorl(rcx, rcx); // Threads level
159 __ cpuid();
161 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB0_offset())));
162 __ movl(Address(rsi, 0), rax);
163 __ movl(Address(rsi, 4), rbx);
164 __ movl(Address(rsi, 8), rcx);
165 __ movl(Address(rsi,12), rdx);
167 __ movl(rax, 0xb);
168 __ movl(rcx, 1); // Cores level
169 __ cpuid();
170 __ push(rax);
171 __ andl(rax, 0x1f); // Determine if valid topology level
172 __ orl(rax, rbx); // eax[4:0] | ebx[0:15] == 0 indicates invalid level
173 __ andl(rax, 0xffff);
174 __ pop(rax);
175 __ jccb(Assembler::equal, std_cpuid4);
177 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB1_offset())));
178 __ movl(Address(rsi, 0), rax);
179 __ movl(Address(rsi, 4), rbx);
180 __ movl(Address(rsi, 8), rcx);
181 __ movl(Address(rsi,12), rdx);
183 __ movl(rax, 0xb);
184 __ movl(rcx, 2); // Packages level
185 __ cpuid();
186 __ push(rax);
187 __ andl(rax, 0x1f); // Determine if valid topology level
188 __ orl(rax, rbx); // eax[4:0] | ebx[0:15] == 0 indicates invalid level
189 __ andl(rax, 0xffff);
190 __ pop(rax);
191 __ jccb(Assembler::equal, std_cpuid4);
193 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB2_offset())));
194 __ movl(Address(rsi, 0), rax);
195 __ movl(Address(rsi, 4), rbx);
196 __ movl(Address(rsi, 8), rcx);
197 __ movl(Address(rsi,12), rdx);
199 //
200 // cpuid(0x4) Deterministic cache params
201 //
202 __ bind(std_cpuid4);
203 __ movl(rax, 4);
204 __ cmpl(rax, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset()))); // Is cpuid(0x4) supported?
205 __ jccb(Assembler::greater, std_cpuid1);
207 __ xorl(rcx, rcx); // L1 cache
208 __ cpuid();
209 __ push(rax);
210 __ andl(rax, 0x1f); // Determine if valid cache parameters used
211 __ orl(rax, rax); // eax[4:0] == 0 indicates invalid cache
212 __ pop(rax);
213 __ jccb(Assembler::equal, std_cpuid1);
215 __ lea(rsi, Address(rbp, in_bytes(VM_Version::dcp_cpuid4_offset())));
216 __ movl(Address(rsi, 0), rax);
217 __ movl(Address(rsi, 4), rbx);
218 __ movl(Address(rsi, 8), rcx);
219 __ movl(Address(rsi,12), rdx);
221 //
222 // Standard cpuid(0x1)
223 //
224 __ bind(std_cpuid1);
225 __ movl(rax, 1);
226 __ cpuid();
227 __ lea(rsi, Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())));
228 __ movl(Address(rsi, 0), rax);
229 __ movl(Address(rsi, 4), rbx);
230 __ movl(Address(rsi, 8), rcx);
231 __ movl(Address(rsi,12), rdx);
233 //
234 // Check if OS has enabled XGETBV instruction to access XCR0
235 // (OSXSAVE feature flag) and CPU supports AVX
236 //
237 __ andl(rcx, 0x18000000);
238 __ cmpl(rcx, 0x18000000);
239 __ jccb(Assembler::notEqual, sef_cpuid);
241 //
242 // XCR0, XFEATURE_ENABLED_MASK register
243 //
244 __ xorl(rcx, rcx); // zero for XCR0 register
245 __ xgetbv();
246 __ lea(rsi, Address(rbp, in_bytes(VM_Version::xem_xcr0_offset())));
247 __ movl(Address(rsi, 0), rax);
248 __ movl(Address(rsi, 4), rdx);
250 //
251 // cpuid(0x7) Structured Extended Features
252 //
253 __ bind(sef_cpuid);
254 __ movl(rax, 7);
255 __ cmpl(rax, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset()))); // Is cpuid(0x7) supported?
256 __ jccb(Assembler::greater, ext_cpuid);
258 __ xorl(rcx, rcx);
259 __ cpuid();
260 __ lea(rsi, Address(rbp, in_bytes(VM_Version::sef_cpuid7_offset())));
261 __ movl(Address(rsi, 0), rax);
262 __ movl(Address(rsi, 4), rbx);
264 //
265 // Extended cpuid(0x80000000)
266 //
267 __ bind(ext_cpuid);
268 __ movl(rax, 0x80000000);
269 __ cpuid();
270 __ cmpl(rax, 0x80000000); // Is cpuid(0x80000001) supported?
271 __ jcc(Assembler::belowEqual, done);
272 __ cmpl(rax, 0x80000004); // Is cpuid(0x80000005) supported?
273 __ jccb(Assembler::belowEqual, ext_cpuid1);
274 __ cmpl(rax, 0x80000006); // Is cpuid(0x80000007) supported?
275 __ jccb(Assembler::belowEqual, ext_cpuid5);
276 __ cmpl(rax, 0x80000007); // Is cpuid(0x80000008) supported?
277 __ jccb(Assembler::belowEqual, ext_cpuid7);
278 //
279 // Extended cpuid(0x80000008)
280 //
281 __ movl(rax, 0x80000008);
282 __ cpuid();
283 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid8_offset())));
284 __ movl(Address(rsi, 0), rax);
285 __ movl(Address(rsi, 4), rbx);
286 __ movl(Address(rsi, 8), rcx);
287 __ movl(Address(rsi,12), rdx);
289 //
290 // Extended cpuid(0x80000007)
291 //
292 __ bind(ext_cpuid7);
293 __ movl(rax, 0x80000007);
294 __ cpuid();
295 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid7_offset())));
296 __ movl(Address(rsi, 0), rax);
297 __ movl(Address(rsi, 4), rbx);
298 __ movl(Address(rsi, 8), rcx);
299 __ movl(Address(rsi,12), rdx);
301 //
302 // Extended cpuid(0x80000005)
303 //
304 __ bind(ext_cpuid5);
305 __ movl(rax, 0x80000005);
306 __ cpuid();
307 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid5_offset())));
308 __ movl(Address(rsi, 0), rax);
309 __ movl(Address(rsi, 4), rbx);
310 __ movl(Address(rsi, 8), rcx);
311 __ movl(Address(rsi,12), rdx);
313 //
314 // Extended cpuid(0x80000001)
315 //
316 __ bind(ext_cpuid1);
317 __ movl(rax, 0x80000001);
318 __ cpuid();
319 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid1_offset())));
320 __ movl(Address(rsi, 0), rax);
321 __ movl(Address(rsi, 4), rbx);
322 __ movl(Address(rsi, 8), rcx);
323 __ movl(Address(rsi,12), rdx);
325 //
326 // return
327 //
328 __ bind(done);
329 __ popf();
330 __ pop(rsi);
331 __ pop(rbx);
332 __ pop(rbp);
333 __ ret(0);
335 # undef __
337 return start;
338 };
339 };
342 void VM_Version::get_processor_features() {
344 _cpu = 4; // 486 by default
345 _model = 0;
346 _stepping = 0;
347 _cpuFeatures = 0;
348 _logical_processors_per_package = 1;
350 if (!Use486InstrsOnly) {
351 // Get raw processor info
352 getPsrInfo_stub(&_cpuid_info);
353 assert_is_initialized();
354 _cpu = extended_cpu_family();
355 _model = extended_cpu_model();
356 _stepping = cpu_stepping();
358 if (cpu_family() > 4) { // it supports CPUID
359 _cpuFeatures = feature_flags();
360 // Logical processors are only available on P4s and above,
361 // and only if hyperthreading is available.
362 _logical_processors_per_package = logical_processor_count();
363 }
364 }
366 _supports_cx8 = supports_cmpxchg8();
367 // xchg and xadd instructions
368 _supports_atomic_getset4 = true;
369 _supports_atomic_getadd4 = true;
370 LP64_ONLY(_supports_atomic_getset8 = true);
371 LP64_ONLY(_supports_atomic_getadd8 = true);
373 #ifdef _LP64
374 // OS should support SSE for x64 and hardware should support at least SSE2.
375 if (!VM_Version::supports_sse2()) {
376 vm_exit_during_initialization("Unknown x64 processor: SSE2 not supported");
377 }
378 // in 64 bit the use of SSE2 is the minimum
379 if (UseSSE < 2) UseSSE = 2;
380 #endif
382 #ifdef AMD64
383 // flush_icache_stub have to be generated first.
384 // That is why Icache line size is hard coded in ICache class,
385 // see icache_x86.hpp. It is also the reason why we can't use
386 // clflush instruction in 32-bit VM since it could be running
387 // on CPU which does not support it.
388 //
389 // The only thing we can do is to verify that flushed
390 // ICache::line_size has correct value.
391 guarantee(_cpuid_info.std_cpuid1_edx.bits.clflush != 0, "clflush is not supported");
392 // clflush_size is size in quadwords (8 bytes).
393 guarantee(_cpuid_info.std_cpuid1_ebx.bits.clflush_size == 8, "such clflush size is not supported");
394 #endif
396 // If the OS doesn't support SSE, we can't use this feature even if the HW does
397 if (!os::supports_sse())
398 _cpuFeatures &= ~(CPU_SSE|CPU_SSE2|CPU_SSE3|CPU_SSSE3|CPU_SSE4A|CPU_SSE4_1|CPU_SSE4_2);
400 if (UseSSE < 4) {
401 _cpuFeatures &= ~CPU_SSE4_1;
402 _cpuFeatures &= ~CPU_SSE4_2;
403 }
405 if (UseSSE < 3) {
406 _cpuFeatures &= ~CPU_SSE3;
407 _cpuFeatures &= ~CPU_SSSE3;
408 _cpuFeatures &= ~CPU_SSE4A;
409 }
411 if (UseSSE < 2)
412 _cpuFeatures &= ~CPU_SSE2;
414 if (UseSSE < 1)
415 _cpuFeatures &= ~CPU_SSE;
417 if (UseAVX < 2)
418 _cpuFeatures &= ~CPU_AVX2;
420 if (UseAVX < 1)
421 _cpuFeatures &= ~CPU_AVX;
423 if (!UseAES && !FLAG_IS_DEFAULT(UseAES))
424 _cpuFeatures &= ~CPU_AES;
426 if (logical_processors_per_package() == 1) {
427 // HT processor could be installed on a system which doesn't support HT.
428 _cpuFeatures &= ~CPU_HT;
429 }
431 char buf[256];
432 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%s%s%s%s%s%s%s",
433 cores_per_cpu(), threads_per_core(),
434 cpu_family(), _model, _stepping,
435 (supports_cmov() ? ", cmov" : ""),
436 (supports_cmpxchg8() ? ", cx8" : ""),
437 (supports_fxsr() ? ", fxsr" : ""),
438 (supports_mmx() ? ", mmx" : ""),
439 (supports_sse() ? ", sse" : ""),
440 (supports_sse2() ? ", sse2" : ""),
441 (supports_sse3() ? ", sse3" : ""),
442 (supports_ssse3()? ", ssse3": ""),
443 (supports_sse4_1() ? ", sse4.1" : ""),
444 (supports_sse4_2() ? ", sse4.2" : ""),
445 (supports_popcnt() ? ", popcnt" : ""),
446 (supports_avx() ? ", avx" : ""),
447 (supports_avx2() ? ", avx2" : ""),
448 (supports_aes() ? ", aes" : ""),
449 (supports_erms() ? ", erms" : ""),
450 (supports_mmx_ext() ? ", mmxext" : ""),
451 (supports_3dnow_prefetch() ? ", 3dnowpref" : ""),
452 (supports_lzcnt() ? ", lzcnt": ""),
453 (supports_sse4a() ? ", sse4a": ""),
454 (supports_ht() ? ", ht": ""),
455 (supports_tsc() ? ", tsc": ""),
456 (supports_tscinv_bit() ? ", tscinvbit": ""),
457 (supports_tscinv() ? ", tscinv": ""));
458 _features_str = strdup(buf);
460 // UseSSE is set to the smaller of what hardware supports and what
461 // the command line requires. I.e., you cannot set UseSSE to 2 on
462 // older Pentiums which do not support it.
463 if (UseSSE > 4) UseSSE=4;
464 if (UseSSE < 0) UseSSE=0;
465 if (!supports_sse4_1()) // Drop to 3 if no SSE4 support
466 UseSSE = MIN2((intx)3,UseSSE);
467 if (!supports_sse3()) // Drop to 2 if no SSE3 support
468 UseSSE = MIN2((intx)2,UseSSE);
469 if (!supports_sse2()) // Drop to 1 if no SSE2 support
470 UseSSE = MIN2((intx)1,UseSSE);
471 if (!supports_sse ()) // Drop to 0 if no SSE support
472 UseSSE = 0;
474 if (UseAVX > 2) UseAVX=2;
475 if (UseAVX < 0) UseAVX=0;
476 if (!supports_avx2()) // Drop to 1 if no AVX2 support
477 UseAVX = MIN2((intx)1,UseAVX);
478 if (!supports_avx ()) // Drop to 0 if no AVX support
479 UseAVX = 0;
481 // Use AES instructions if available.
482 if (supports_aes()) {
483 if (FLAG_IS_DEFAULT(UseAES)) {
484 UseAES = true;
485 }
486 } else if (UseAES) {
487 if (!FLAG_IS_DEFAULT(UseAES))
488 warning("AES instructions not available on this CPU");
489 FLAG_SET_DEFAULT(UseAES, false);
490 }
492 // The AES intrinsic stubs require AES instruction support (of course)
493 // but also require sse3 mode for instructions it use.
494 if (UseAES && (UseSSE > 2)) {
495 if (FLAG_IS_DEFAULT(UseAESIntrinsics)) {
496 UseAESIntrinsics = true;
497 }
498 } else if (UseAESIntrinsics) {
499 if (!FLAG_IS_DEFAULT(UseAESIntrinsics))
500 warning("AES intrinsics not available on this CPU");
501 FLAG_SET_DEFAULT(UseAESIntrinsics, false);
502 }
504 #ifdef COMPILER2
505 if (UseFPUForSpilling) {
506 if (UseSSE < 2) {
507 // Only supported with SSE2+
508 FLAG_SET_DEFAULT(UseFPUForSpilling, false);
509 }
510 }
511 if (MaxVectorSize > 0) {
512 if (!is_power_of_2(MaxVectorSize)) {
513 warning("MaxVectorSize must be a power of 2");
514 FLAG_SET_DEFAULT(MaxVectorSize, 32);
515 }
516 if (MaxVectorSize > 32) {
517 FLAG_SET_DEFAULT(MaxVectorSize, 32);
518 }
519 if (MaxVectorSize > 16 && UseAVX == 0) {
520 // Only supported with AVX+
521 FLAG_SET_DEFAULT(MaxVectorSize, 16);
522 }
523 if (UseSSE < 2) {
524 // Only supported with SSE2+
525 FLAG_SET_DEFAULT(MaxVectorSize, 0);
526 }
527 }
528 #endif
530 // On new cpus instructions which update whole XMM register should be used
531 // to prevent partial register stall due to dependencies on high half.
532 //
533 // UseXmmLoadAndClearUpper == true --> movsd(xmm, mem)
534 // UseXmmLoadAndClearUpper == false --> movlpd(xmm, mem)
535 // UseXmmRegToRegMoveAll == true --> movaps(xmm, xmm), movapd(xmm, xmm).
536 // UseXmmRegToRegMoveAll == false --> movss(xmm, xmm), movsd(xmm, xmm).
538 if( is_amd() ) { // AMD cpus specific settings
539 if( supports_sse2() && FLAG_IS_DEFAULT(UseAddressNop) ) {
540 // Use it on new AMD cpus starting from Opteron.
541 UseAddressNop = true;
542 }
543 if( supports_sse2() && FLAG_IS_DEFAULT(UseNewLongLShift) ) {
544 // Use it on new AMD cpus starting from Opteron.
545 UseNewLongLShift = true;
546 }
547 if( FLAG_IS_DEFAULT(UseXmmLoadAndClearUpper) ) {
548 if( supports_sse4a() ) {
549 UseXmmLoadAndClearUpper = true; // use movsd only on '10h' Opteron
550 } else {
551 UseXmmLoadAndClearUpper = false;
552 }
553 }
554 if( FLAG_IS_DEFAULT(UseXmmRegToRegMoveAll) ) {
555 if( supports_sse4a() ) {
556 UseXmmRegToRegMoveAll = true; // use movaps, movapd only on '10h'
557 } else {
558 UseXmmRegToRegMoveAll = false;
559 }
560 }
561 if( FLAG_IS_DEFAULT(UseXmmI2F) ) {
562 if( supports_sse4a() ) {
563 UseXmmI2F = true;
564 } else {
565 UseXmmI2F = false;
566 }
567 }
568 if( FLAG_IS_DEFAULT(UseXmmI2D) ) {
569 if( supports_sse4a() ) {
570 UseXmmI2D = true;
571 } else {
572 UseXmmI2D = false;
573 }
574 }
575 if( FLAG_IS_DEFAULT(UseSSE42Intrinsics) ) {
576 if( supports_sse4_2() && UseSSE >= 4 ) {
577 UseSSE42Intrinsics = true;
578 }
579 }
581 // Use count leading zeros count instruction if available.
582 if (supports_lzcnt()) {
583 if (FLAG_IS_DEFAULT(UseCountLeadingZerosInstruction)) {
584 UseCountLeadingZerosInstruction = true;
585 }
586 }
588 // some defaults for AMD family 15h
589 if ( cpu_family() == 0x15 ) {
590 // On family 15h processors default is no sw prefetch
591 if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
592 AllocatePrefetchStyle = 0;
593 }
594 // Also, if some other prefetch style is specified, default instruction type is PREFETCHW
595 if (FLAG_IS_DEFAULT(AllocatePrefetchInstr)) {
596 AllocatePrefetchInstr = 3;
597 }
598 // On family 15h processors use XMM and UnalignedLoadStores for Array Copy
599 if (supports_sse2() && FLAG_IS_DEFAULT(UseXMMForArrayCopy)) {
600 UseXMMForArrayCopy = true;
601 }
602 if (supports_sse2() && FLAG_IS_DEFAULT(UseUnalignedLoadStores)) {
603 UseUnalignedLoadStores = true;
604 }
605 }
607 #ifdef COMPILER2
608 if (MaxVectorSize > 16) {
609 // Limit vectors size to 16 bytes on current AMD cpus.
610 FLAG_SET_DEFAULT(MaxVectorSize, 16);
611 }
612 #endif // COMPILER2
613 }
615 if( is_intel() ) { // Intel cpus specific settings
616 if( FLAG_IS_DEFAULT(UseStoreImmI16) ) {
617 UseStoreImmI16 = false; // don't use it on Intel cpus
618 }
619 if( cpu_family() == 6 || cpu_family() == 15 ) {
620 if( FLAG_IS_DEFAULT(UseAddressNop) ) {
621 // Use it on all Intel cpus starting from PentiumPro
622 UseAddressNop = true;
623 }
624 }
625 if( FLAG_IS_DEFAULT(UseXmmLoadAndClearUpper) ) {
626 UseXmmLoadAndClearUpper = true; // use movsd on all Intel cpus
627 }
628 if( FLAG_IS_DEFAULT(UseXmmRegToRegMoveAll) ) {
629 if( supports_sse3() ) {
630 UseXmmRegToRegMoveAll = true; // use movaps, movapd on new Intel cpus
631 } else {
632 UseXmmRegToRegMoveAll = false;
633 }
634 }
635 if( cpu_family() == 6 && supports_sse3() ) { // New Intel cpus
636 #ifdef COMPILER2
637 if( FLAG_IS_DEFAULT(MaxLoopPad) ) {
638 // For new Intel cpus do the next optimization:
639 // don't align the beginning of a loop if there are enough instructions
640 // left (NumberOfLoopInstrToAlign defined in c2_globals.hpp)
641 // in current fetch line (OptoLoopAlignment) or the padding
642 // is big (> MaxLoopPad).
643 // Set MaxLoopPad to 11 for new Intel cpus to reduce number of
644 // generated NOP instructions. 11 is the largest size of one
645 // address NOP instruction '0F 1F' (see Assembler::nop(i)).
646 MaxLoopPad = 11;
647 }
648 #endif // COMPILER2
649 if (FLAG_IS_DEFAULT(UseXMMForArrayCopy)) {
650 UseXMMForArrayCopy = true; // use SSE2 movq on new Intel cpus
651 }
652 if (supports_sse4_2() && supports_ht()) { // Newest Intel cpus
653 if (FLAG_IS_DEFAULT(UseUnalignedLoadStores)) {
654 UseUnalignedLoadStores = true; // use movdqu on newest Intel cpus
655 }
656 }
657 if (supports_sse4_2() && UseSSE >= 4) {
658 if (FLAG_IS_DEFAULT(UseSSE42Intrinsics)) {
659 UseSSE42Intrinsics = true;
660 }
661 }
662 }
663 }
665 // Use population count instruction if available.
666 if (supports_popcnt()) {
667 if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
668 UsePopCountInstruction = true;
669 }
670 } else if (UsePopCountInstruction) {
671 warning("POPCNT instruction is not available on this CPU");
672 FLAG_SET_DEFAULT(UsePopCountInstruction, false);
673 }
675 // Use fast-string operations if available.
676 if (supports_erms()) {
677 if (FLAG_IS_DEFAULT(UseFastStosb)) {
678 UseFastStosb = true;
679 }
680 } else if (UseFastStosb) {
681 warning("fast-string operations are not available on this CPU");
682 FLAG_SET_DEFAULT(UseFastStosb, false);
683 }
685 #ifdef COMPILER2
686 if (FLAG_IS_DEFAULT(AlignVector)) {
687 // Modern processors allow misaligned memory operations for vectors.
688 AlignVector = !UseUnalignedLoadStores;
689 }
690 #endif // COMPILER2
692 assert(0 <= ReadPrefetchInstr && ReadPrefetchInstr <= 3, "invalid value");
693 assert(0 <= AllocatePrefetchInstr && AllocatePrefetchInstr <= 3, "invalid value");
695 // set valid Prefetch instruction
696 if( ReadPrefetchInstr < 0 ) ReadPrefetchInstr = 0;
697 if( ReadPrefetchInstr > 3 ) ReadPrefetchInstr = 3;
698 if( ReadPrefetchInstr == 3 && !supports_3dnow_prefetch() ) ReadPrefetchInstr = 0;
699 if( !supports_sse() && supports_3dnow_prefetch() ) ReadPrefetchInstr = 3;
701 if( AllocatePrefetchInstr < 0 ) AllocatePrefetchInstr = 0;
702 if( AllocatePrefetchInstr > 3 ) AllocatePrefetchInstr = 3;
703 if( AllocatePrefetchInstr == 3 && !supports_3dnow_prefetch() ) AllocatePrefetchInstr=0;
704 if( !supports_sse() && supports_3dnow_prefetch() ) AllocatePrefetchInstr = 3;
706 // Allocation prefetch settings
707 intx cache_line_size = prefetch_data_size();
708 if( cache_line_size > AllocatePrefetchStepSize )
709 AllocatePrefetchStepSize = cache_line_size;
711 assert(AllocatePrefetchLines > 0, "invalid value");
712 if( AllocatePrefetchLines < 1 ) // set valid value in product VM
713 AllocatePrefetchLines = 3;
714 assert(AllocateInstancePrefetchLines > 0, "invalid value");
715 if( AllocateInstancePrefetchLines < 1 ) // set valid value in product VM
716 AllocateInstancePrefetchLines = 1;
718 AllocatePrefetchDistance = allocate_prefetch_distance();
719 AllocatePrefetchStyle = allocate_prefetch_style();
721 if( is_intel() && cpu_family() == 6 && supports_sse3() ) {
722 if( AllocatePrefetchStyle == 2 ) { // watermark prefetching on Core
723 #ifdef _LP64
724 AllocatePrefetchDistance = 384;
725 #else
726 AllocatePrefetchDistance = 320;
727 #endif
728 }
729 if( supports_sse4_2() && supports_ht() ) { // Nehalem based cpus
730 AllocatePrefetchDistance = 192;
731 AllocatePrefetchLines = 4;
732 #ifdef COMPILER2
733 if (AggressiveOpts && FLAG_IS_DEFAULT(UseFPUForSpilling)) {
734 FLAG_SET_DEFAULT(UseFPUForSpilling, true);
735 }
736 #endif
737 }
738 }
739 assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");
741 #ifdef _LP64
742 // Prefetch settings
743 PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
744 PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
745 PrefetchFieldsAhead = prefetch_fields_ahead();
746 #endif
748 if (FLAG_IS_DEFAULT(ContendedPaddingWidth) &&
749 (cache_line_size > ContendedPaddingWidth))
750 ContendedPaddingWidth = cache_line_size;
752 #ifndef PRODUCT
753 if (PrintMiscellaneous && Verbose) {
754 tty->print_cr("Logical CPUs per core: %u",
755 logical_processors_per_package());
756 tty->print("UseSSE=%d",UseSSE);
757 if (UseAVX > 0) {
758 tty->print(" UseAVX=%d",UseAVX);
759 }
760 if (UseAES) {
761 tty->print(" UseAES=1");
762 }
763 tty->cr();
764 tty->print("Allocation");
765 if (AllocatePrefetchStyle <= 0 || UseSSE == 0 && !supports_3dnow_prefetch()) {
766 tty->print_cr(": no prefetching");
767 } else {
768 tty->print(" prefetching: ");
769 if (UseSSE == 0 && supports_3dnow_prefetch()) {
770 tty->print("PREFETCHW");
771 } else if (UseSSE >= 1) {
772 if (AllocatePrefetchInstr == 0) {
773 tty->print("PREFETCHNTA");
774 } else if (AllocatePrefetchInstr == 1) {
775 tty->print("PREFETCHT0");
776 } else if (AllocatePrefetchInstr == 2) {
777 tty->print("PREFETCHT2");
778 } else if (AllocatePrefetchInstr == 3) {
779 tty->print("PREFETCHW");
780 }
781 }
782 if (AllocatePrefetchLines > 1) {
783 tty->print_cr(" at distance %d, %d lines of %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
784 } else {
785 tty->print_cr(" at distance %d, one line of %d bytes", AllocatePrefetchDistance, AllocatePrefetchStepSize);
786 }
787 }
789 if (PrefetchCopyIntervalInBytes > 0) {
790 tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes);
791 }
792 if (PrefetchScanIntervalInBytes > 0) {
793 tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes);
794 }
795 if (PrefetchFieldsAhead > 0) {
796 tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);
797 }
798 if (ContendedPaddingWidth > 0) {
799 tty->print_cr("ContendedPaddingWidth %d", ContendedPaddingWidth);
800 }
801 }
802 #endif // !PRODUCT
803 }
805 void VM_Version::initialize() {
806 ResourceMark rm;
807 // Making this stub must be FIRST use of assembler
809 stub_blob = BufferBlob::create("getPsrInfo_stub", stub_size);
810 if (stub_blob == NULL) {
811 vm_exit_during_initialization("Unable to allocate getPsrInfo_stub");
812 }
813 CodeBuffer c(stub_blob);
814 VM_Version_StubGenerator g(&c);
815 getPsrInfo_stub = CAST_TO_FN_PTR(getPsrInfo_stub_t,
816 g.generate_getPsrInfo());
818 get_processor_features();
819 }
