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| author | Chris Lattner <sabre@nondot.org> | 2006-11-14 08:08:46 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-11-14 08:08:46 +0000 |
| commit | 20ddd4a7ae3798fa65a2bc6e7258e3d4500ecbe9 (patch) | |
| tree | 47bf433fed04f80f75648e4cb26cf068e90849b2 | |
| parent | e511b74f4aa0b74a0d1923beb8b95b966eed2050 (diff) | |
it would be nice of ctlz were lowered to bsf etc.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31730 91177308-0d34-0410-b5e6-96231b3b80d8
| -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 834a47c51b..629d30336b 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -114,6 +114,15 @@ ctz: however, check that these are defined for 0 and 32. Our intrinsics are, GCC's aren't. +Another example (use predsimplify to eliminate a select): + +int foo (unsigned long j) { + if (j) + return __builtin_ffs (j) - 1; + else + return 0; +} + //===---------------------------------------------------------------------===// Use push/pop instructions in prolog/epilog sequences instead of stores off |