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X86: Implement a microop that moves sign bits.

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This commit is contained in:
Gabe Black 2009-08-17 20:22:56 -07:00
parent 4c23e631f2
commit 90786e43fc
1 changed files with 17 additions and 0 deletions
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17
src/arch/x86/isa/microops/mediaop.isa
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@ -330,6 +330,23 @@ let {{
}
'''
class Movsign(MediaOp):
def __init__(self, dest, src, \
size = None, destSize = None, srcSize = None, ext = None):
super(Movsign, self).__init__(dest, src,\
"InstRegIndex(0)", size, destSize, srcSize, ext)
code = '''
int items = sizeof(FloatRegBits) / srcSize;
uint64_t result = 0;
int offset = (ext & 0x1) ? items : 0;
for (int i = 0; i < items; i++) {
uint64_t picked =
bits(FpSrcReg1.uqw, (i + 1) * 8 * srcSize - 1);
result = insertBits(result, i + offset, i + offset, picked);
}
DestReg = DestReg | result;
'''
class Unpack(MediaOp):
code = '''
assert(srcSize == destSize);