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| author | Gabe Black <gblack@eecs.umich.edu> | 2007-07-26 22:06:30 -0700 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2007-07-26 22:06:30 -0700 |
| commit | 57428b8b0bc277f45dfcc415677a116c0c0673a6 (patch) | |
| tree | badf1049524458d34947921bfaa3a77b8a417079 /src/arch/x86 | |
| parent | 749ed15b606d0d6d5f27277a0b7d456aa56a6ac5 (diff) | |
| download | gem5-57428b8b0bc277f45dfcc415677a116c0c0673a6.tar.xz | |
X86: Fix carry calculation for subtraction based microops.
The carry flag should be calculated using the -complement- of the second operand, not it's negation. The carry in which is part of computing the 2's complement may induce a carry, but if you've already caused the carry before you get the carry computing logic involved, it will miss it.
--HG--
extra : convert_revision : 318cf86929664fc52ed9e023606a9e892eba635c
Diffstat (limited to 'src/arch/x86')
| -rw-r--r-- | src/arch/x86/isa/microops/regop.isa | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/arch/x86/isa/microops/regop.isa b/src/arch/x86/isa/microops/regop.isa index c3f008993..bb34df7df 100644 --- a/src/arch/x86/isa/microops/regop.isa +++ b/src/arch/x86/isa/microops/regop.isa @@ -343,7 +343,7 @@ let {{ immCode = matcher.sub("imm8", code) if subtract: - secondSrc = "-op2, true" + secondSrc = "~op2, true" else: secondSrc = "op2" |