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| author | Chris Lattner <sabre@nondot.org> | 2006-03-14 19:31:24 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-03-14 19:31:24 +0000 |
| commit | cbd3cdd2397b31a34c8af403811d06aa94149b40 (patch) | |
| tree | 7d0cf4d230920b5bb700a04327e93a7dee43e304 | |
| parent | 4d9b10b098ae1e6b35c5509ff8217bf23931e71b (diff) | |
add a note
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26762 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/README.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index 000fdded16..c19dc7e308 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -113,3 +113,11 @@ for 1,2,4,8 bytes. //===---------------------------------------------------------------------===// +This code: +int rot(unsigned char b) { int a = ((b>>1) ^ (b<<7)) & 0xff; return a; } + +Can be improved in two ways: + +1. The instcombiner should eliminate the type conversions. +2. The X86 backend should turn this into a rotate by one bit. + |