diff options
| author | Gabe Black <gblack@eecs.umich.edu> | 2009-12-19 01:48:31 -0800 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2009-12-19 01:48:31 -0800 |
| commit | c7ca1d3c8a3b785c80ec23bd84666c3c6e08b4e4 (patch) | |
| tree | 46c2eddae0dd6ccb43fafd81fce33f2a84208303 /src/arch/x86/isa/microops/mediaop.isa | |
| parent | 25545115336e961a570bafdb8c2934db0015dece (diff) | |
| download | gem5-c7ca1d3c8a3b785c80ec23bd84666c3c6e08b4e4.tar.xz | |
X86: Add a common named flag for signed media operations.
Diffstat (limited to 'src/arch/x86/isa/microops/mediaop.isa')
| -rw-r--r-- | src/arch/x86/isa/microops/mediaop.isa | 70 |
1 files changed, 37 insertions, 33 deletions
diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa index 84d2d7f70..900c166f8 100644 --- a/src/arch/x86/isa/microops/mediaop.isa +++ b/src/arch/x86/isa/microops/mediaop.isa @@ -451,14 +451,14 @@ let {{ // Handle saturation. if (signBit) { if (overflow != mask(destBits - srcBits + 1)) { - if (ext & 0x1) + if (signedOp()) picked = (ULL(1) << (destBits - 1)); else picked = 0; } } else { if (overflow != 0) { - if (ext & 0x1) + if (signedOp()) picked = mask(destBits - 1); else picked = mask(destBits); @@ -479,14 +479,14 @@ let {{ // Handle saturation. if (signBit) { if (overflow != mask(destBits - srcBits + 1)) { - if (ext & 0x1) + if (signedOp()) picked = (ULL(1) << (destBits - 1)); else picked = 0; } } else { if (overflow != 0) { - if (ext & 0x1) + if (signedOp()) picked = mask(destBits - 1); else picked = mask(destBits); @@ -648,7 +648,7 @@ let {{ (0 - (arg2Bits & (ULL(1) << (sizeBits - 1)))); uint64_t resBits; - if (ext & 0x2) { + if (signedOp()) { if (arg1 < arg2) { resBits = arg1Bits; } else { @@ -686,7 +686,7 @@ let {{ (0 - (arg2Bits & (ULL(1) << (sizeBits - 1)))); uint64_t resBits; - if (ext & 0x2) { + if (signedOp()) { if (arg1 > arg2) { resBits = arg1Bits; } else { @@ -949,17 +949,19 @@ let {{ uint64_t resBits = arg1Bits + arg2Bits; if (ext & 0x2) { - if (findCarry(sizeBits, resBits, arg1Bits, arg2Bits)) - resBits = mask(sizeBits); - } else if (ext & 0x4) { - int arg1Sign = bits(arg1Bits, sizeBits - 1); - int arg2Sign = bits(arg2Bits, sizeBits - 1); - int resSign = bits(resBits, sizeBits - 1); - if ((arg1Sign == arg2Sign) && (arg1Sign != resSign)) { - if (resSign == 0) - resBits = (ULL(1) << (sizeBits - 1)); - else - resBits = mask(sizeBits - 1); + if (signedOp()) { + int arg1Sign = bits(arg1Bits, sizeBits - 1); + int arg2Sign = bits(arg2Bits, sizeBits - 1); + int resSign = bits(resBits, sizeBits - 1); + if ((arg1Sign == arg2Sign) && (arg1Sign != resSign)) { + if (resSign == 0) + resBits = (ULL(1) << (sizeBits - 1)); + else + resBits = mask(sizeBits - 1); + } + } else { + if (findCarry(sizeBits, resBits, arg1Bits, arg2Bits)) + resBits = mask(sizeBits); } } @@ -984,21 +986,23 @@ let {{ uint64_t resBits = arg1Bits - arg2Bits; if (ext & 0x2) { - if (arg2Bits > arg1Bits) { - resBits = 0; - } else if (!findCarry(sizeBits, resBits, - arg1Bits, ~arg2Bits)) { - resBits = mask(sizeBits); - } - } else if (ext & 0x4) { - int arg1Sign = bits(arg1Bits, sizeBits - 1); - int arg2Sign = !bits(arg2Bits, sizeBits - 1); - int resSign = bits(resBits, sizeBits - 1); - if ((arg1Sign == arg2Sign) && (arg1Sign != resSign)) { - if (resSign == 0) - resBits = (ULL(1) << (sizeBits - 1)); - else - resBits = mask(sizeBits - 1); + if (signedOp()) { + int arg1Sign = bits(arg1Bits, sizeBits - 1); + int arg2Sign = !bits(arg2Bits, sizeBits - 1); + int resSign = bits(resBits, sizeBits - 1); + if ((arg1Sign == arg2Sign) && (arg1Sign != resSign)) { + if (resSign == 0) + resBits = (ULL(1) << (sizeBits - 1)); + else + resBits = mask(sizeBits - 1); + } + } else { + if (arg2Bits > arg1Bits) { + resBits = 0; + } else if (!findCarry(sizeBits, resBits, + arg1Bits, ~arg2Bits)) { + resBits = mask(sizeBits); + } } } @@ -1030,7 +1034,7 @@ let {{ uint64_t arg2Bits = bits(FpSrcReg2.uqw, srcHiIndex, srcLoIndex); uint64_t resBits; - if (ext & 0x2) { + if (signedOp()) { int64_t arg1 = arg1Bits | (0 - (arg1Bits & (ULL(1) << (srcBits - 1)))); int64_t arg2 = arg2Bits | |