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it would be nice of ctlz were lowered to bsf etc.

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llvm-svn: 31730
This commit is contained in:
Chris Lattner 2006-11-14 08:08:46 +00:00
parent 0114b0c20e
commit da103686a6
1 changed files with 9 additions and 0 deletions
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9
lib/Target/X86/README.txt
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@ -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