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| author | Evan Cheng <evan.cheng@apple.com> | 2006-01-13 01:20:42 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2006-01-13 01:20:42 +0000 |
| commit | e08c270623599861b7269f8dad533abe7e57771f (patch) | |
| tree | 6a74371219d63fd37a316c77a96b1f6d01f0187d | |
| parent | fcf39d4589210f3cad03324fbb0b0b29e26c3cf8 (diff) | |
| download | external_llvm-e08c270623599861b7269f8dad533abe7e57771f.zip external_llvm-e08c270623599861b7269f8dad533abe7e57771f.tar.gz external_llvm-e08c270623599861b7269f8dad533abe7e57771f.tar.bz2 | |
Minor update.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25263 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/X86/README.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index a08e8fd..4869c5e 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -112,3 +112,12 @@ FP_TO_SINT when the source operand is already in memory. //===---------------------------------------------------------------------===// Check if load folding would add a cycle in the dag. + +//===---------------------------------------------------------------------===// + +Model X86 EFLAGS as a real register to avoid redudant cmp / test. e.g. + + cmpl $1, %eax + setg %al + testb %al, %al # unnecessary + jne .BB7 |