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X86: Implement a "sum of absolute differences" microop.

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Gabe Black 2009-08-17 20:15:16 -07:00
parent 31d29ee3f8
commit 470dcef229
1 changed files with 19 additions and 0 deletions
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19
src/arch/x86/isa/microops/mediaop.isa
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@ -948,6 +948,25 @@ let {{
FpDestReg.uqw = result;
'''
class Msad(MediaOp):
code = '''
int srcBits = srcSize * 8;
int items = sizeof(FloatRegBits) / srcSize;
uint64_t sum = 0;
for (int i = 0; i < items; i++) {
int hiIndex = (i + 1) * srcBits - 1;
int loIndex = (i + 0) * srcBits;
uint64_t arg1Bits = bits(FpSrcReg1.uqw, hiIndex, loIndex);
uint64_t arg2Bits = bits(FpSrcReg2.uqw, hiIndex, loIndex);
int64_t resBits = arg1Bits - arg2Bits;
if (resBits < 0)
resBits = -resBits;
sum += resBits;
}
FpDestReg.uqw = sum & mask(destSize * 8);
'''
class Cvti2f(MediaOp):
def __init__(self, dest, src, \
size = None, destSize = None, srcSize = None, ext = None):