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X86: Implement an unpack microop.

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This commit is contained in:
Gabe Black 2009-08-17 18:15:39 -07:00
parent 6457fb7003
commit ecc62e750e
1 changed files with 26 additions and 0 deletions
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26
src/arch/x86/isa/microops/mediaop.isa
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@ -308,4 +308,30 @@ let {{
FpDestReg.uqw =
insertBits(FpDestReg.uqw, destSize * 8 - 1, 0, srcReg1);
'''
class Unpack(MediaOp):
code = '''
assert(srcSize == destSize);
int size = destSize;
int items = (sizeof(FloatRegBits) / size) / 2;
int offset = sel ? items : 0;
uint64_t result = 0;
for (int i = 0; i < items; i++) {
uint64_t pickedLow =
bits(FpSrcReg1.uqw, (i + offset + 1) * 8 * size - 1,
(i + offset) * 8 * size);
result = insertBits(result,
(2 * i + 1) * 8 * size - 1,
(2 * i + 0) * 8 * size,
pickedLow);
uint64_t pickedHigh =
bits(FpSrcReg2.uqw, (i + offset + 1) * 8 * size - 1,
(i + offset) * 8 * size);
result = insertBits(result,
(2 * i + 2) * 8 * size - 1,
(2 * i + 1) * 8 * size,
pickedHigh);
}
FpDestReg.uqw = result;
'''
}};