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author | Gabe Black <gblack@eecs.umich.edu> | 2009-08-17 20:04:02 -0700 |
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committer | Gabe Black <gblack@eecs.umich.edu> | 2009-08-17 20:04:02 -0700 |
commit | 83df309a7ed25373e265b3885d3871547dff6274 (patch) | |
tree | 8fb7d74a2962bb9dacf774943f737ca72af22207 /src/arch/x86/isa/microops | |
parent | 35b0983ca983af7223ce1ef38ff15d8462aa7d4b (diff) | |
download | gem5-83df309a7ed25373e265b3885d3871547dff6274.tar.xz |
X86: Implement a media microop that converts between floating point data types.
Diffstat (limited to 'src/arch/x86/isa/microops')
-rw-r--r-- | src/arch/x86/isa/microops/mediaop.isa | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa index 2995a82d1..fe8368707 100644 --- a/src/arch/x86/isa/microops/mediaop.isa +++ b/src/arch/x86/isa/microops/mediaop.isa @@ -819,6 +819,74 @@ let {{ FpDestReg.uqw = result; ''' + class Cvtf2f(MediaOp): + def __init__(self, dest, src, \ + size = None, destSize = None, srcSize = None, ext = None): + super(Cvtf2f, self).__init__(dest, src,\ + "InstRegIndex(0)", size, destSize, srcSize, ext) + code = ''' + union floatInt + { + float f; + uint32_t i; + }; + union doubleInt + { + double d; + uint64_t i; + }; + + assert(destSize == 4 || destSize == 8); + assert(srcSize == 4 || srcSize == 8); + int srcSizeBits = srcSize * 8; + int destSizeBits = destSize * 8; + int items; + int srcStart = 0; + int destStart = 0; + if (srcSize == 2 * destSize) { + items = (ext & 0x1) ? 1: sizeof(FloatRegBits) / srcSize; + if (ext & 0x2) + destStart = destSizeBits * items; + } else if (destSize == 2 * srcSize) { + items = (ext & 0x1) ? 1: sizeof(FloatRegBits) / destSize; + if (ext & 0x2) + srcStart = srcSizeBits * items; + } else { + items = (ext & 0x1) ? 1: sizeof(FloatRegBits) / destSize; + } + uint64_t result = FpDestReg.uqw; + + for (int i = 0; i < items; i++) { + int srcHiIndex = srcStart + (i + 1) * srcSizeBits - 1; + int srcLoIndex = srcStart + (i + 0) * srcSizeBits; + uint64_t argBits = bits(FpSrcReg1.uqw, srcHiIndex, srcLoIndex); + double arg; + + if (srcSize == 4) { + floatInt fi; + fi.i = argBits; + arg = fi.f; + } else { + doubleInt di; + di.i = argBits; + arg = di.d; + } + if (destSize == 4) { + floatInt fi; + fi.f = arg; + argBits = fi.i; + } else { + doubleInt di; + di.d = arg; + argBits = di.i; + } + int destHiIndex = destStart + (i + 1) * destSizeBits - 1; + int destLoIndex = destStart + (i + 0) * destSizeBits; + result = insertBits(result, destHiIndex, destLoIndex, argBits); + } + FpDestReg.uqw = result; + ''' + class Mcmpi2r(MediaOp): code = ''' union floatInt |