diff options
author | Gabe Black <gblack@eecs.umich.edu> | 2009-08-17 18:38:51 -0700 |
---|---|---|
committer | Gabe Black <gblack@eecs.umich.edu> | 2009-08-17 18:38:51 -0700 |
commit | 94e771e283265700de82b41aaeea33a4fdfd9ac0 (patch) | |
tree | 6572809557d51385d42ed043411e39b0080358cb /src/arch | |
parent | dd81a34829ec578d24d43b4d3fc7a4a16622720e (diff) | |
download | gem5-94e771e283265700de82b41aaeea33a4fdfd9ac0.tar.xz |
X86: Implement a floating point media multiply microop.
Diffstat (limited to 'src/arch')
-rw-r--r-- | src/arch/x86/isa/microops/mediaop.isa | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa index b9cfc0075..16cfbb5f9 100644 --- a/src/arch/x86/isa/microops/mediaop.isa +++ b/src/arch/x86/isa/microops/mediaop.isa @@ -666,4 +666,50 @@ let {{ } FpDestReg.uqw = result; ''' + + class Mmulf(MediaOp): + code = ''' + union floatInt + { + float f; + uint32_t i; + }; + union doubleInt + { + double d; + uint64_t i; + }; + + assert(srcSize == destSize); + int size = srcSize; + int sizeBits = size * 8; + assert(srcSize == 4 || srcSize == 8); + int items = (ext & 0x1) ? 1: (sizeof(FloatRegBits) / size); + uint64_t result = FpDestReg.uqw; + + for (int i = 0; i < items; i++) { + int hiIndex = (i + 1) * sizeBits - 1; + int loIndex = (i + 0) * sizeBits; + uint64_t arg1Bits = bits(FpSrcReg1.uqw, hiIndex, loIndex); + uint64_t arg2Bits = bits(FpSrcReg2.uqw, hiIndex, loIndex); + uint64_t resBits; + + if (size == 4) { + floatInt arg1, arg2, res; + arg1.i = arg1Bits; + arg2.i = arg2Bits; + res.f = arg1.f * arg2.f; + resBits = res.i; + } else { + doubleInt arg1, arg2, res; + arg1.i = arg1Bits; + arg2.i = arg2Bits; + res.d = arg1.d * arg2.d; + resBits = res.i; + } + + result = insertBits(result, hiIndex, loIndex, resBits); + } + FpDestReg.uqw = result; + ''' }}; |