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aba789b2f0
combineCmov tries to remove compares against BSR/BSF if we can prove the input to the BSR/BSF are never zero. As far as I can tell most of the time codegenprepare despeculates ctlz/cttz and gives us a cttz_zero_undef/ctlz_zero_undef which don't use a cmov. So the only way I found to trigger this code is to show codegenprepare an illegal type which it won't despeculate. I think we should be turning ctlz/cttz into ctlz_zero_undef/cttz_zero_undef for these cases before we ever get to operation legalization where the cmov is created. But wanted to add these tests so we don't regress. llvm-svn: 324409 |
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