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| author | Gabe Black <gblack@eecs.umich.edu> | 2009-08-17 20:25:14 -0700 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2009-08-17 20:25:14 -0700 |
| commit | 288f4286322f56255d15b13224371ec60b4b2cac (patch) | |
| tree | 3f74dd71f729c0de1885f2697ba0ebb85fc49fd6 /src/arch | |
| parent | 87ad6772094170cf92e8de385e1dea47a31924dc (diff) | |
| download | gem5-288f4286322f56255d15b13224371ec60b4b2cac.tar.xz | |
X86: Implement a microop that compares fp values and writes a mask as a result.
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/isa/microops/mediaop.isa | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa index 75a4c9468..f268a6b90 100644 --- a/src/arch/x86/isa/microops/mediaop.isa +++ b/src/arch/x86/isa/microops/mediaop.isa @@ -1343,6 +1343,88 @@ let {{ FpDestReg.uqw = result; ''' + class Mcmpf2r(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; + int items = (ext & 0x8) ? 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); + double arg1, arg2; + + if (size == 4) { + floatInt fi; + fi.i = arg1Bits; + arg1 = fi.f; + fi.i = arg2Bits; + arg2 = fi.f; + } else { + doubleInt di; + di.i = arg1Bits; + arg1 = di.d; + di.i = arg2Bits; + arg2 = di.d; + } + + uint64_t resBits = 0; + bool nanop = isnan(arg1) || isnan(arg2); + switch (ext & mask(3)) { + case 0: + if (arg1 == arg2 && !nanop) + resBits = mask(sizeBits); + break; + case 1: + if (arg1 < arg2 && !nanop) + resBits = mask(sizeBits); + break; + case 2: + if (arg1 <= arg2 && !nanop) + resBits = mask(sizeBits); + break; + case 3: + if (nanop) + resBits = mask(sizeBits); + break; + case 4: + if (arg1 != arg2 || nanop) + resBits = mask(sizeBits); + break; + case 5: + if (!(arg1 < arg2) || nanop) + resBits = mask(sizeBits); + break; + case 6: + if (!(arg1 <= arg2) || nanop) + resBits = mask(sizeBits); + break; + case 7: + if (!nanop) + resBits = mask(sizeBits); + break; + }; + + result = insertBits(result, hiIndex, loIndex, resBits); + } + FpDestReg.uqw = result; + ''' + class Mcmpf2rf(MediaOp): def __init__(self, src1, src2,\ size = None, destSize = None, srcSize = None, ext = None): |