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llvm-svn: 28572
This commit is contained in:
Chris Lattner 2006-05-30 21:29:15 +00:00
parent 31b150e334
commit a5c50baaf5
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