From: Chris Lattner <sabre@nondot.org>
Date: Tue, 14 Nov 2006 08:08:46 +0000 (+0000)
Subject: it would be nice of ctlz were lowered to bsf etc.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=20ddd4a7ae3798fa65a2bc6e7258e3d4500ecbe9;p=oota-llvm.git

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
---

diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt
index 834a47c51b9..629d30336bc 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