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84fca61ca5
This revision attempts to recognize following population-count pattern:
while(a) { c++; ... ; a &= a - 1; ... },
where <c> and <a>could be used multiple times in the loop body.
TODO: On X8664 and ARM, __buildin_ctpop() are not expanded to a efficent
instruction sequence, which need to be improved in the following commits.
Reviewed by Nadav, really appreciate!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168931 91177308-0d34-0410-b5e6-96231b3b80d8
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| .. | ||
| basic.ll | ||
| crash.ll | ||
| debug-line.ll | ||
| lit.local.cfg | ||
| memset_noidiom.ll | ||
| non-canonical-loop.ll | ||
| popcnt.ll | ||
| scev-invalidation.ll | ||