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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28572 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-05-30 21:29:15 +00:00
parent 7b05350906
commit 9e18ef5262
1 changed files with 19 additions and 0 deletions
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19
lib/Target/README.txt
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@ -251,3 +251,22 @@ void %test(uint* %P) {
ret void
}
//===---------------------------------------------------------------------===//
dag/inst combine "clz(x)>>5 -> x==0" for 32-bit x.
Compile:
int bar(int x)
{
int t = __builtin_clz(x);
return -(t>>5);
}
to:
_bar: addic r3,r3,-1
subfe r3,r3,r3
blr