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Commit 4ee5747f authored by Benjamin Kramer's avatar Benjamin Kramer
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ComputeMaskedBits: Make knownzero computation more aggressive for ctlz with undef zero. 

unsigned foo(unsigned x) { return 31 - __builtin_clz(x); }
now compiles into a single "bsrl" instruction on x86.

llvm-svn: 147255
parent 010337c8
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