forked from OSchip/llvm-project
8c13e3680d
This is a follow-up to the FIXME that was added with D7474 ( http://reviews.llvm.org/rL229531 ). I thought this load folding bug had been made hard-to-hit, but it turns out to be very easy when targeting 32-bit x86 and causes a miscompile/crash in Wine: https://bugs.winehq.org/show_bug.cgi?id=38826 https://llvm.org/bugs/show_bug.cgi?id=22371#c25 The quick fix is to simply remove the scalar FP logical instructions from the load folding table in X86InstrInfo, but that causes us to miss load folds that should be possible when lowering fabs, fneg, fcopysign. So the majority of this patch is altering those lowerings to use *vector* FP logical instructions (because that's all x86 gives us anyway). That lets us do the load folding legally. Differential Revision: http://reviews.llvm.org/D11477 llvm-svn: 243361 |
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