Add a missed optimization

llvm-svn: 24495
2005-11-28 04:52:39 +00:00 · 2005-11-28 04:52:39 +00:00 · 820c94e467
parent 1f47b25727
commit 820c94e467
1 changed files with 9 additions and 0 deletions
--- a/llvm/lib/Target/X86/README.txt
+++ b/llvm/lib/Target/X86/README.txt
@ -73,3 +73,12 @@ Another useful one would be  ~0ULL >> X and ~0ULL << X.
 Should support emission of the bswap instruction, probably by adding a new
 DAG node for byte swapping.  Also useful on PPC which has byte-swapping loads.

+//===---------------------------------------------------------------------===//
+
+Compile this:
+_Bool f(_Bool a) { return a!=1; }
+
+into:
+        movzbl  %dil, %eax
+        xorl    $1, %eax
+        ret