diff options
| -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 a08e8fd458..4869c5e956 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 |