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PR24141: https://llvm.org/bugs/show_bug.cgi?id=24141 contains a test case where we have duplicate entries in a node's uses() list. After r241826, we use CombineTo() to delete dead nodes when combining the uses into reciprocal multiplies, but this fails if we encounter the just-deleted node again in the list. The solution in this patch is to not add duplicate entries to the list of users that we will subsequently iterate over. For the test case, this avoids triggering the combine divisors logic entirely because there really is only one user of the divisor. Differential Revision: http://reviews.llvm.org/D11345 llvm-svn: 243500 |
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