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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 | 5271a1f9b5c4b0b6d4685eebb70b4d4f6903697b (patch) | |
| tree | add7cecd3afd3591f933aa32f73a597b5c3cb4c1 /llvm/lib | |
| parent | 2024aabcb0162247ec03625f4b4f93da5854d6da (diff) | |
| download | bcm5719-llvm-5271a1f9b5c4b0b6d4685eebb70b4d4f6903697b.tar.gz bcm5719-llvm-5271a1f9b5c4b0b6d4685eebb70b4d4f6903697b.zip | |
add a note
llvm-svn: 26762
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/README.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/Target/README.txt b/llvm/lib/Target/README.txt index 000fdded169..c19dc7e308d 100644 --- a/llvm/lib/Target/README.txt +++ b/llvm/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. + |
