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5886331bc4
For some cases, InstCombine replaces the sequence of xor/sub instruction followed by cmp instruction into a single cmp instruction. However, this replacement may result suboptimal result especially when the xor/sub has more than one use, as discussed in bug 26465 (https://llvm.org/bugs/show_bug.cgi?id=26465). This patch make the replacement happen only when xor/sub has only one use. Differential Revision: http://reviews.llvm.org/D16915 Patch by Taewook Oh! llvm-svn: 260695
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