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another testcase.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25862 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2006-02-01 00:28:12 +00:00
parent 0d084c9e4a
commit 0ddc18047d
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lib/Target/PowerPC/README.txt
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@ -460,3 +460,20 @@ In particular, the two compares (marked 1) could be shared by reversing one.
This could be done in the dag combiner, by swapping a BR_CC when a SETCC of the
same operands (but backwards) exists. In this case, this wouldn't save us
anything though, because the compares still wouldn't be shared.
===-------------------------------------------------------------------------===
A simple case we generate suboptimal code on:
int test(int X) {
return X == 0 ? 32 : 0;
}
_test:
cntlzw r2, r3
srwi r2, r2, 5
slwi r3, r2, 5
blr
The shifts should be one 'andi'.