summaryrefslogtreecommitdiff
path: root/src/arch
diff options
context:
space:
mode:
authorGabe Black <gblack@eecs.umich.edu>2009-08-17 18:36:18 -0700
committerGabe Black <gblack@eecs.umich.edu>2009-08-17 18:36:18 -0700
commit9fee8b75aa3d8a85395dd0e94fb4a5754817ae24 (patch)
treee6e15692d45b8dc35c6bd1a0082d6c51308a33cd /src/arch
parent49c2610c04e3bb1998355f0bc146ecd925eb8fca (diff)
downloadgem5-9fee8b75aa3d8a85395dd0e94fb4a5754817ae24.tar.xz
X86: Implement a media floating point subtract microop.
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/x86/isa/microops/mediaop.isa46
1 files changed, 46 insertions, 0 deletions
diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa
index 334944222..b9cfc0075 100644
--- a/src/arch/x86/isa/microops/mediaop.isa
+++ b/src/arch/x86/isa/microops/mediaop.isa
@@ -620,4 +620,50 @@ let {{
}
FpDestReg.uqw = result;
'''
+
+ class Msubf(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;
+ '''
}};