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comparison src/cpu/x86/vm/vm_version_x86.cpp @ 2358:82de9bd880e3

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7028394: Newer AMD Processor Prefetch Defaults Summary: This new default has shown improvement across many workloads. Reviewed-by: kvn Contributed-by: tom.deneau@amd.com
author kvn
date Thu, 17 Mar 2011 12:08:01 -0700
parents f95d63e2154a
children a988a7bb3b8a
comparison
equal deleted inserted replaced
2357:8033953d67ff 2358:82de9bd880e3
434 if (supports_lzcnt()) { 434 if (supports_lzcnt()) {
435 if (FLAG_IS_DEFAULT(UseCountLeadingZerosInstruction)) { 435 if (FLAG_IS_DEFAULT(UseCountLeadingZerosInstruction)) {
436 UseCountLeadingZerosInstruction = true; 436 UseCountLeadingZerosInstruction = true;
437 } 437 }
438 } 438 }
439
440 // On family 21 processors default is no sw prefetch
441 if ( cpu_family() == 21 ) {
442 if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
443 AllocatePrefetchStyle = 0;
444 }
445 }
439 } 446 }
440 447
441 if( is_intel() ) { // Intel cpus specific settings 448 if( is_intel() ) { // Intel cpus specific settings
442 if( FLAG_IS_DEFAULT(UseStoreImmI16) ) { 449 if( FLAG_IS_DEFAULT(UseStoreImmI16) ) {
443 UseStoreImmI16 = false; // don't use it on Intel cpus 450 UseStoreImmI16 = false; // don't use it on Intel cpus