Mercurial > hg > truffle
diff src/cpu/x86/vm/vm_version_x86.hpp @ 643:c771b7f43bbf
6378821: bitCount() should use POPC on SPARC processors and AMD+10h
Summary: bitCount() should use POPC on SPARC processors where POPC is implemented directly in hardware.
Reviewed-by: kvn, never
author | twisti |
---|---|
date | Fri, 13 Mar 2009 11:35:17 -0700 |
parents | 22e09c0f4b47 |
children | 93c14e5562c4 |
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--- a/src/cpu/x86/vm/vm_version_x86.hpp Thu Mar 12 10:37:46 2009 -0700 +++ b/src/cpu/x86/vm/vm_version_x86.hpp Fri Mar 13 11:35:17 2009 -0700 @@ -70,7 +70,9 @@ dca : 1, sse4_1 : 1, sse4_2 : 1, - : 11; + : 2, + popcnt : 1, + : 8; } bits; }; @@ -179,7 +181,8 @@ CPU_SSSE3 = (1 << 9), CPU_SSE4A = (1 << 10), CPU_SSE4_1 = (1 << 11), - CPU_SSE4_2 = (1 << 12) + CPU_SSE4_2 = (1 << 12), + CPU_POPCNT = (1 << 13) } cpuFeatureFlags; // cpuid information block. All info derived from executing cpuid with @@ -290,6 +293,8 @@ result |= CPU_SSE4_1; if (_cpuid_info.std_cpuid1_ecx.bits.sse4_2 != 0) result |= CPU_SSE4_2; + if (_cpuid_info.std_cpuid1_ecx.bits.popcnt != 0) + result |= CPU_POPCNT; return result; } @@ -379,6 +384,7 @@ static bool supports_ssse3() { return (_cpuFeatures & CPU_SSSE3)!= 0; } static bool supports_sse4_1() { return (_cpuFeatures & CPU_SSE4_1) != 0; } static bool supports_sse4_2() { return (_cpuFeatures & CPU_SSE4_2) != 0; } + static bool supports_popcnt() { return (_cpuFeatures & CPU_POPCNT) != 0; } // // AMD features //