changeset 8f37a2946cc3 in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=8f37a2946cc3
description:
X86: Implement a floating point media multiply microop.
diffstat:
1 file changed, 46 insertions(+)
src/arch/x86/isa/microops/mediaop.isa | 46 +++++++++++++++++++++++++++++++++
diffs (54 lines):
diff -r f677e05d723d -r 8f37a2946cc3 src/arch/x86/isa/microops/mediaop.isa
--- a/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 18:36:20 2009 -0700
+++ b/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 18:38:51 2009 -0700
@@ -666,4 +666,50 @@
}
FpDestReg.uqw = result;
'''
+
+ class Mmulf(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;
+ assert(srcSize == 4 || srcSize == 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);
+ uint64_t arg2Bits = bits(FpSrcReg2.uqw, hiIndex, loIndex);
+ uint64_t resBits;
+
+ if (size == 4) {
+ floatInt arg1, arg2, res;
+ arg1.i = arg1Bits;
+ arg2.i = arg2Bits;
+ res.f = arg1.f * arg2.f;
+ resBits = res.i;
+ } else {
+ doubleInt arg1, arg2, res;
+ arg1.i = arg1Bits;
+ arg2.i = arg2Bits;
+ res.d = arg1.d * arg2.d;
+ resBits = res.i;
+ }
+
+ result = insertBits(result, hiIndex, loIndex, resBits);
+ }
+ FpDestReg.uqw = result;
+ '''
}};
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