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authorGabe Black <gblack@eecs.umich.edu>2009-08-17 20:04:02 -0700
committerGabe Black <gblack@eecs.umich.edu>2009-08-17 20:04:02 -0700
commitf122c93faa00e503a58c2f4050e4b2c7664912a3 (patch)
treebe0886800c30a9ceaedc78baca3a2ae995ae17f5
parentdf1b3fdcfba3039122d8b2ded5e64200fec6eebd (diff)
downloadgem5-f122c93faa00e503a58c2f4050e4b2c7664912a3.tar.xz
X86: Implement a microop that compares fp values and writes a mask as its result.
-rw-r--r--src/arch/x86/isa/microops/mediaop.isa39
1 files changed, 39 insertions, 0 deletions
diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa
index 641f37865..2995a82d1 100644
--- a/src/arch/x86/isa/microops/mediaop.isa
+++ b/src/arch/x86/isa/microops/mediaop.isa
@@ -818,4 +818,43 @@ let {{
}
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;
+ '''
}};