[llvm-bugs] [Bug 34967] New: Code generation fails with AESIMC intrinsic

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Oct 16 11:10:02 PDT 2017


            Bug ID: 34967
           Summary: Code generation fails with AESIMC intrinsic
           Product: clang
           Version: 5.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pavel.kryukov at phystech.edu
                CC: llvm-bugs at lists.llvm.org

Created attachment 19290
  --> https://bugs.llvm.org/attachment.cgi?id=19290&action=edit
Bugpoint for Clang 3.8.0


I faced a code generator bug while compiling AES-NI instrinsics. That code is
compiled with GCC and Visual Studio without problems, but different versions of
Clang fail in different environments. I've attached clang-cl test case from
Clang 5.0.0. Unfortunately, I couldn't find a way to run -emit-llvm option with
Clang, so I'm sending bugpoint results for clang 3.8.0.

During my attempts to find a workaround I localized a problem a little with
some dummy code (see below). Finally, I got rid of pointer arithmetic, so
compilation becomes sucseeded.

__m128i tmp = _mm_setzero_si128();
tmp = _mm_aesimc_si128(*(++keysched));
// *(--invkeysched) = tmp; // uncommenting this line leads to failure


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