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X86: Implement a media average microop.

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This commit is contained in:
Gabe Black 2009-08-17 20:15:16 -07:00
parent 45bae0c70f
commit f6b12bfa8d
1 changed files with 20 additions and 0 deletions
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20
src/arch/x86/isa/microops/mediaop.isa
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@ -955,6 +955,26 @@ let {{
FpDestReg.uqw = result;
'''
class Mavg(MediaOp):
code = '''
assert(srcSize == destSize);
int size = srcSize;
int sizeBits = size * 8;
int items = (ext & 0x1) ? 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);
uint64_t resBits = (arg1Bits + arg2Bits + 1) / 2;
result = insertBits(result, hiIndex, loIndex, resBits);
}
FpDestReg.uqw = result;
'''
class Msad(MediaOp):
code = '''
int srcBits = srcSize * 8;