[llvm-bugs] [Bug 32306] New: _mm256_max_epi32 broken up into cmp and blend

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Mar 16 04:49:13 PDT 2017


            Bug ID: 32306
           Summary: _mm256_max_epi32 broken up into cmp and blend
           Product: clang
           Version: 4.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mail at sven-woop.de
                CC: llvm-bugs at lists.llvm.org

Created attachment 18109
  --> https://bugs.llvm.org/attachment.cgi?id=18109&action=edit

Under some circumstances _mm256_max_epi32 will get broken up into some compare
and blend intrinsics which hurts performance. Minimal reproducer attached.

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