[llvm-bugs] [Bug 26058] New: Instruction does not dominate all uses with -O3 on x86_64

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26058

            Bug ID: 26058
           Summary: Instruction does not dominate all uses with -O3 on
                    x86_64
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dcb314 at hotmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15573
  --> https://llvm.org/bugs/attachment.cgi?id=15573&action=edit
preprocessed C++ source code

The attached preprocessed C++ code compiles fine with -O2, but causes
a compiler crash with -O3.

Instruction does not dominate all uses!
  %69 = extractelement <2 x float> %62, i32 1
  %63 = insertelement <4 x float> undef, float %69, i32 0
Instruction does not dominate all uses!
  %69 = extractelement <2 x float> %62, i32 1
  %64 = insertelement <4 x float> %63, float %69, i32 1
fatal error: error in backend: Broken function found, compilation aborted!
clang: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 3.8.0 (trunk 256708)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/dcb/llvm/results/bin
clang: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang: note: diagnostic msg: Error generating preprocessed source(s) - no
preprocessable inputs.

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