diff options
| author | Evan Cheng <evan.cheng@apple.com> | 2006-02-14 08:25:32 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2006-02-14 08:25:32 +0000 |
| commit | 952b7d6a1efc3b02fee379aeae4765feac2aa726 (patch) | |
| tree | dab0fd7087f3a0231e2ee1a797687da6b3d631e6 /lib | |
| parent | 87ed716d21bec7ea29674b4b010aa051ad2b7193 (diff) | |
Add a entry.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26173 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/README.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index 3bbf3c26e4..50d87bc173 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -426,3 +426,20 @@ When: "movl $_dst, _ptr" is sufficient. //===---------------------------------------------------------------------===// Use fisttp to do FP to integer conversion whenever it is available. + +//===---------------------------------------------------------------------===// + +Instead of the following for memset char*, 1, 10: + + movl $16843009, 4(%edx) + movl $16843009, (%edx) + movw $257, 8(%edx) + +It might be better to generate + + movl $16843009, %eax + movl %eax, 4(%edx) + movl %eax, (%edx) + movw al, 8(%edx) + +when we can spare a register. It reduces code size. |