changeset c246dc2ec640 in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=c246dc2ec640
description:
X86: Implement a microop that compares fp values and writes a mask as
its result.
diffstat:
1 file changed, 39 insertions(+)
src/arch/x86/isa/microops/mediaop.isa | 39 +++++++++++++++++++++++++++++++++
diffs (47 lines):
diff -r b7f5a02ea9b7 -r c246dc2ec640 src/arch/x86/isa/microops/mediaop.isa
--- a/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 18:50:29 2009 -0700
+++ b/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 20:04:02 2009 -0700
@@ -818,4 +818,43 @@
}
FpDestReg.uqw = result;
'''
+
+ class Mcmpi2r(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;
+ 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);
+ int64_t arg1 = arg1Bits |
+ (0 - (arg1Bits & (1 << (sizeBits - 1))));
+ uint64_t arg2Bits = bits(FpSrcReg2.uqw, hiIndex, loIndex);
+ int64_t arg2 = arg2Bits |
+ (0 - (arg2Bits & (1 << (sizeBits - 1))));
+
+ uint64_t resBits = 0;
+ if ((ext & 0x2) == 0 && arg1 == arg2 ||
+ (ext & 0x2) == 0x2 && arg1 > arg2)
+ resBits = mask(sizeBits);
+
+ result = insertBits(result, hiIndex, loIndex, resBits);
+ }
+ FpDestReg.uqw = result;
+ '''
}};
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