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| 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 | f976d79f7825fb58e4e8436f9af8da4e25b856ec (patch) | |
| tree | ea280af4bab7ea4fe29e6bb7062e739c534ad28a /llvm/lib | |
| parent | 6a37456d739701578fe537d330350e18bb2f7577 (diff) | |
| download | bcm5719-llvm-f976d79f7825fb58e4e8436f9af8da4e25b856ec.tar.gz bcm5719-llvm-f976d79f7825fb58e4e8436f9af8da4e25b856ec.zip | |
Add a entry.
llvm-svn: 26173
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/README.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/README.txt b/llvm/lib/Target/X86/README.txt index 3bbf3c26e41..50d87bc173a 100644 --- a/llvm/lib/Target/X86/README.txt +++ b/llvm/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. |
