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comparison src/cpu/x86/vm/vm_version_x86.cpp @ 6275:957c266d8bc5

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Merge with http://hg.openjdk.java.net/hsx/hsx24/hotspot/
author Doug Simon <doug.simon@oracle.com>
date Tue, 21 Aug 2012 10:39:19 +0200
parents 33df1aeaebbf 2c368ea3e844
children e522a00b91aa
comparison
equal deleted inserted replaced
5891:fd8832ae511d 6275:957c266d8bc5
465 if (!supports_avx2()) // Drop to 1 if no AVX2 support 465 if (!supports_avx2()) // Drop to 1 if no AVX2 support
466 UseAVX = MIN2((intx)1,UseAVX); 466 UseAVX = MIN2((intx)1,UseAVX);
467 if (!supports_avx ()) // Drop to 0 if no AVX support 467 if (!supports_avx ()) // Drop to 0 if no AVX support
468 UseAVX = 0; 468 UseAVX = 0;
469 469
470 #ifdef COMPILER2
471 if (UseFPUForSpilling) {
472 if (UseSSE < 2) {
473 // Only supported with SSE2+
474 FLAG_SET_DEFAULT(UseFPUForSpilling, false);
475 }
476 }
477 if (MaxVectorSize > 0) {
478 if (!is_power_of_2(MaxVectorSize)) {
479 warning("MaxVectorSize must be a power of 2");
480 FLAG_SET_DEFAULT(MaxVectorSize, 32);
481 }
482 if (MaxVectorSize > 32) {
483 FLAG_SET_DEFAULT(MaxVectorSize, 32);
484 }
485 if (MaxVectorSize > 16 && UseAVX == 0) {
486 // Only supported with AVX+
487 FLAG_SET_DEFAULT(MaxVectorSize, 16);
488 }
489 if (UseSSE < 2) {
490 // Only supported with SSE2+
491 FLAG_SET_DEFAULT(MaxVectorSize, 0);
492 }
493 }
494 #endif
495
470 // On new cpus instructions which update whole XMM register should be used 496 // On new cpus instructions which update whole XMM register should be used
471 // to prevent partial register stall due to dependencies on high half. 497 // to prevent partial register stall due to dependencies on high half.
472 // 498 //
473 // UseXmmLoadAndClearUpper == true --> movsd(xmm, mem) 499 // UseXmmLoadAndClearUpper == true --> movsd(xmm, mem)
474 // UseXmmLoadAndClearUpper == false --> movlpd(xmm, mem) 500 // UseXmmLoadAndClearUpper == false --> movlpd(xmm, mem)
534 // Also, if some other prefetch style is specified, default instruction type is PREFETCHW 560 // Also, if some other prefetch style is specified, default instruction type is PREFETCHW
535 if (FLAG_IS_DEFAULT(AllocatePrefetchInstr)) { 561 if (FLAG_IS_DEFAULT(AllocatePrefetchInstr)) {
536 AllocatePrefetchInstr = 3; 562 AllocatePrefetchInstr = 3;
537 } 563 }
538 // On family 15h processors use XMM and UnalignedLoadStores for Array Copy 564 // On family 15h processors use XMM and UnalignedLoadStores for Array Copy
539 if( FLAG_IS_DEFAULT(UseXMMForArrayCopy) ) { 565 if( supports_sse2() && FLAG_IS_DEFAULT(UseXMMForArrayCopy) ) {
540 UseXMMForArrayCopy = true; 566 UseXMMForArrayCopy = true;
541 } 567 }
542 if( FLAG_IS_DEFAULT(UseUnalignedLoadStores) && UseXMMForArrayCopy ) { 568 if( FLAG_IS_DEFAULT(UseUnalignedLoadStores) && UseXMMForArrayCopy ) {
543 UseUnalignedLoadStores = true; 569 UseUnalignedLoadStores = true;
544 } 570 }
545 } 571 }
546 572
573 #ifdef COMPILER2
574 if (MaxVectorSize > 16) {
575 // Limit vectors size to 16 bytes on current AMD cpus.
576 FLAG_SET_DEFAULT(MaxVectorSize, 16);
577 }
578 #endif // COMPILER2
547 } 579 }
548 580
549 if( is_intel() ) { // Intel cpus specific settings 581 if( is_intel() ) { // Intel cpus specific settings
550 if( FLAG_IS_DEFAULT(UseStoreImmI16) ) { 582 if( FLAG_IS_DEFAULT(UseStoreImmI16) ) {
551 UseStoreImmI16 = false; // don't use it on Intel cpus 583 UseStoreImmI16 = false; // don't use it on Intel cpus
603 } 635 }
604 } else if (UsePopCountInstruction) { 636 } else if (UsePopCountInstruction) {
605 warning("POPCNT instruction is not available on this CPU"); 637 warning("POPCNT instruction is not available on this CPU");
606 FLAG_SET_DEFAULT(UsePopCountInstruction, false); 638 FLAG_SET_DEFAULT(UsePopCountInstruction, false);
607 } 639 }
608
609 #ifdef COMPILER2
610 if (UseFPUForSpilling) {
611 if (UseSSE < 2) {
612 // Only supported with SSE2+
613 FLAG_SET_DEFAULT(UseFPUForSpilling, false);
614 }
615 }
616 #endif
617 640
618 assert(0 <= ReadPrefetchInstr && ReadPrefetchInstr <= 3, "invalid value"); 641 assert(0 <= ReadPrefetchInstr && ReadPrefetchInstr <= 3, "invalid value");
619 assert(0 <= AllocatePrefetchInstr && AllocatePrefetchInstr <= 3, "invalid value"); 642 assert(0 <= AllocatePrefetchInstr && AllocatePrefetchInstr <= 3, "invalid value");
620 643
621 // set valid Prefetch instruction 644 // set valid Prefetch instruction