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X86: Implement a microop that compares fp values and writes a mask as a result.

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This commit is contained in:
Gabe Black 2009-08-17 20:25:14 -07:00
parent 87ad677209
commit 288f428632
1 changed files with 82 additions and 0 deletions
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82
src/arch/x86/isa/microops/mediaop.isa
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@ -1343,6 +1343,88 @@ let {{
FpDestReg.uqw = result;
'''
class Mcmpf2r(MediaOp):
code = '''
union floatInt
{
float f;
uint32_t i;
};
union doubleInt
{
double d;
uint64_t i;
};
assert(srcSize == destSize);
int size = srcSize;
int sizeBits = size * 8;
int items = (ext & 0x8) ? 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);
double arg1, arg2;
if (size == 4) {
floatInt fi;
fi.i = arg1Bits;
arg1 = fi.f;
fi.i = arg2Bits;
arg2 = fi.f;
} else {
doubleInt di;
di.i = arg1Bits;
arg1 = di.d;
di.i = arg2Bits;
arg2 = di.d;
}
uint64_t resBits = 0;
bool nanop = isnan(arg1) || isnan(arg2);
switch (ext & mask(3)) {
case 0:
if (arg1 == arg2 && !nanop)
resBits = mask(sizeBits);
break;
case 1:
if (arg1 < arg2 && !nanop)
resBits = mask(sizeBits);
break;
case 2:
if (arg1 <= arg2 && !nanop)
resBits = mask(sizeBits);
break;
case 3:
if (nanop)
resBits = mask(sizeBits);
break;
case 4:
if (arg1 != arg2 || nanop)
resBits = mask(sizeBits);
break;
case 5:
if (!(arg1 < arg2) || nanop)
resBits = mask(sizeBits);
break;
case 6:
if (!(arg1 <= arg2) || nanop)
resBits = mask(sizeBits);
break;
case 7:
if (!nanop)
resBits = mask(sizeBits);
break;
};
result = insertBits(result, hiIndex, loIndex, resBits);
}
FpDestReg.uqw = result;
'''
class Mcmpf2rf(MediaOp):
def __init__(self, src1, src2,\
size = None, destSize = None, srcSize = None, ext = None):