diff options
| author | Gabe Black <gblack@eecs.umich.edu> | 2009-08-17 20:15:15 -0700 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2009-08-17 20:15:15 -0700 |
| commit | 3424de2861756714a85eeafa22b485f6673aaf70 (patch) | |
| tree | c034a7b2c98a6ab14f5538582806e6d4e2af2522 | |
| parent | c76459e5a7b5faaa8d64a3c5b461565dafd774fc (diff) | |
| download | gem5-3424de2861756714a85eeafa22b485f6673aaf70.tar.xz | |
X86: Implement a media integer multiply microop.
| -rw-r--r-- | src/arch/x86/isa/microops/mediaop.isa | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa index 08ba14b00..b07b57ce9 100644 --- a/src/arch/x86/isa/microops/mediaop.isa +++ b/src/arch/x86/isa/microops/mediaop.isa @@ -870,6 +870,45 @@ let {{ FpDestReg.uqw = result; ''' + class Mmuli(MediaOp): + code = ''' + int srcBits = srcSize * 8; + int destBits = destSize * 8; + assert(destBits <= 64); + assert(destSize >= srcSize); + int items = (ext & 0x1) ? 1: (sizeof(FloatRegBits) / destSize); + uint64_t result = FpDestReg.uqw; + + for (int i = 0; i < items; i++) { + int srcHiIndex = (i + 1) * srcBits - 1; + int srcLoIndex = (i + 0) * srcBits; + uint64_t arg1Bits = bits(FpSrcReg1.uqw, srcHiIndex, srcLoIndex); + uint64_t arg2Bits = bits(FpSrcReg2.uqw, srcHiIndex, srcLoIndex); + uint64_t resBits; + + if (ext & 0x2) { + int64_t arg1 = arg1Bits | + (0 - (arg1Bits & (1 << (srcBits - 1)))); + int64_t arg2 = arg2Bits | + (0 - (arg2Bits & (1 << (srcBits - 1)))); + resBits = (uint64_t)(arg1 * arg2); + } else { + resBits = arg1Bits * arg2Bits; + } + + if (ext & 0x4) + resBits += (1 << (destBits - 1)); + + if (ext & 0x8) + resBits >>= destBits; + + int destHiIndex = (i + 1) * destBits - 1; + int destLoIndex = (i + 0) * destBits; + result = insertBits(result, destHiIndex, destLoIndex, resBits); + } + FpDestReg.uqw = result; + ''' + class Cvti2f(MediaOp): def __init__(self, dest, src, \ size = None, destSize = None, srcSize = None, ext = None): |