jdk8-mips64-public/hotspot: changeset 2808:2a34a4fbc52c

7037812: few more defaults changes for new AMD processors
Summary: use PREFETCHW as default prefetch instruction, set UseXMMForArrayCopy and UseUnalignedLoadStores to true by default.
Reviewed-by: kvn
Contributed-by: tom.deneau@amd.com

     1.1 --- a/src/cpu/x86/vm/vm_version_x86.cpp	Mon Apr 18 06:50:57 2011 -0700
     1.2 +++ b/src/cpu/x86/vm/vm_version_x86.cpp	Tue Apr 19 09:30:17 2011 -0700
     1.3 @@ -441,12 +441,25 @@
     1.4        }
     1.5      }
     1.6  
     1.7 -    // On family 21 processors default is no sw prefetch
     1.8 -    if ( cpu_family() == 21 ) {
     1.9 +    // some defaults for AMD family 15h
    1.10 +    if ( cpu_family() == 0x15 ) {
    1.11 +      // On family 15h processors default is no sw prefetch
    1.12        if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
    1.13          AllocatePrefetchStyle = 0;
    1.14        }
    1.15 +      // Also, if some other prefetch style is specified, default instruction type is PREFETCHW
    1.16 +      if (FLAG_IS_DEFAULT(AllocatePrefetchInstr)) {
    1.17 +        AllocatePrefetchInstr = 3;
    1.18 +      }
    1.19 +      // On family 15h processors use XMM and UnalignedLoadStores for Array Copy
    1.20 +      if( FLAG_IS_DEFAULT(UseXMMForArrayCopy) ) {
    1.21 +        UseXMMForArrayCopy = true;
    1.22 +      }
    1.23 +      if( FLAG_IS_DEFAULT(UseUnalignedLoadStores) && UseXMMForArrayCopy ) {
    1.24 +        UseUnalignedLoadStores = true;
    1.25 +      }
    1.26      }
    1.27 +
    1.28    }
    1.29  
    1.30    if( is_intel() ) { // Intel cpus specific settings

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changeset

7037812: few more defaults changes for new AMD processors