diff options
| -rw-r--r-- | src/arch/x86/isa/microops/mediaop.isa | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa index f268a6b90..7ebe2ec10 100644 --- a/src/arch/x86/isa/microops/mediaop.isa +++ b/src/arch/x86/isa/microops/mediaop.isa @@ -1176,6 +1176,78 @@ let {{ FpDestReg.uqw = result; ''' + class Cvtf2i(MediaOp): + def __init__(self, dest, src, \ + size = None, destSize = None, srcSize = None, ext = None): + super(Cvtf2i, 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 (ext & 0x4) { + if (arg >= 0) + arg += 0.5; + else + arg -= 0.5; + } + + if (destSize == 4) { + argBits = (uint32_t)(float)arg; + } else { + argBits = (uint64_t)arg; + } + int destHiIndex = destStart + (i + 1) * destSizeBits - 1; + int destLoIndex = destStart + (i + 0) * destSizeBits; + result = insertBits(result, destHiIndex, destLoIndex, argBits); + } + FpDestReg.uqw = result; + ''' + class Cvti2f(MediaOp): def __init__(self, dest, src, \ size = None, destSize = None, srcSize = None, ext = None): |