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add a missed loop deletion case.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126103 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -254,6 +254,20 @@ unsigned long reverse(unsigned v) {
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//===---------------------------------------------------------------------===//
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[LOOP DELETION]
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We don't delete this output free loop, because trip count analysis doesn't
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realize that it is finite (if it were infinite, it would be undefined). Not
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having this blocks Loop Idiom from matching strlen and friends.
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void foo(char *C) {
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int x = 0;
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while (*C)
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++x,++C;
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}
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//===---------------------------------------------------------------------===//
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[LOOP RECOGNITION]
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These idioms should be recognized as popcount (see PR1488):
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