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X86: Implement a media integer multiply microop.

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This commit is contained in:
Gabe Black 2009-08-17 20:15:15 -07:00
parent c76459e5a7
commit 3424de2861
1 changed files with 39 additions and 0 deletions
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39
src/arch/x86/isa/microops/mediaop.isa
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@ -870,6 +870,45 @@ let {{
FpDestReg.uqw = result;
'''
class Mmuli(MediaOp):
code = '''
int srcBits = srcSize * 8;
int destBits = destSize * 8;
assert(destBits <= 64);
assert(destSize >= srcSize);
int items = (ext & 0x1) ? 1: (sizeof(FloatRegBits) / destSize);
uint64_t result = FpDestReg.uqw;
for (int i = 0; i < items; i++) {
int srcHiIndex = (i + 1) * srcBits - 1;
int srcLoIndex = (i + 0) * srcBits;
uint64_t arg1Bits = bits(FpSrcReg1.uqw, srcHiIndex, srcLoIndex);
uint64_t arg2Bits = bits(FpSrcReg2.uqw, srcHiIndex, srcLoIndex);
uint64_t resBits;
if (ext & 0x2) {
int64_t arg1 = arg1Bits |
(0 - (arg1Bits & (1 << (srcBits - 1))));
int64_t arg2 = arg2Bits |
(0 - (arg2Bits & (1 << (srcBits - 1))));
resBits = (uint64_t)(arg1 * arg2);
} else {
resBits = arg1Bits * arg2Bits;
}
if (ext & 0x4)
resBits += (1 << (destBits - 1));
if (ext & 0x8)
resBits >>= destBits;
int destHiIndex = (i + 1) * destBits - 1;
int destLoIndex = (i + 0) * destBits;
result = insertBits(result, destHiIndex, destLoIndex, resBits);
}
FpDestReg.uqw = result;
'''
class Cvti2f(MediaOp):
def __init__(self, dest, src, \
size = None, destSize = None, srcSize = None, ext = None):