sanchayanmaity/gem5
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

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

Browse source
This commit is contained in:
Gabe Black 2009-08-17 20:04:02 -07:00
parent df1b3fdcfb
commit f122c93faa
1 changed files with 39 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

39
src/arch/x86/isa/microops/mediaop.isa
View file

@ -818,4 +818,43 @@ let {{
}
FpDestReg.uqw = result;
'''
class Mcmpi2r(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 & 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);
int64_t arg1 = arg1Bits |
(0 - (arg1Bits & (1 << (sizeBits - 1))));
uint64_t arg2Bits = bits(FpSrcReg2.uqw, hiIndex, loIndex);
int64_t arg2 = arg2Bits |
(0 - (arg2Bits & (1 << (sizeBits - 1))));
uint64_t resBits = 0;
if ((ext & 0x2) == 0 && arg1 == arg2 ||
(ext & 0x2) == 0x2 && arg1 > arg2)
resBits = mask(sizeBits);
result = insertBits(result, hiIndex, loIndex, resBits);
}
FpDestReg.uqw = result;
'''
}};