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X86: Implement a shuffle media microop.

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This commit is contained in:
Gabe Black 2009-08-17 20:25:13 -07:00
parent d9970f139a
commit 1fed0161d9
1 changed files with 42 additions and 0 deletions
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42
src/arch/x86/isa/microops/mediaop.isa
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@ -365,6 +365,48 @@ let {{
FpDestReg.uqw = result;
'''
class shuffle(MediaOp):
code = '''
assert(srcSize == destSize);
int size = srcSize;
int sizeBits = size * 8;
int items = sizeof(FloatRegBits) / size;
int options;
int optionBits;
if (size == 8) {
options = 2;
optionBits = 1;
} else {
options = 4;
optionBits = 2;
}
uint64_t result = 0;
uint8_t sel = ext;
for (int i = 0; i < items; i++) {
uint64_t resBits;
uint8_t lsel = sel & mask(optionBits);
if (lsel * size >= sizeof(FloatRegBits)) {
lsel -= options / 2;
resBits = bits(FpSrcReg2.uqw,
(lsel + 1) * sizeBits - 1,
(lsel + 0) * sizeBits);
} else {
resBits = bits(FpSrcReg1.uqw,
(lsel + 1) * sizeBits - 1,
(lsel + 0) * sizeBits);
}
sel >>= optionBits;
int hiIndex = (i + 1) * sizeBits - 1;
int loIndex = (i + 0) * sizeBits;
result = insertBits(result, hiIndex, loIndex, resBits);
}
FpDestReg.uqw = result;
'''
class Unpack(MediaOp):
code = '''
assert(srcSize == destSize);