[llvm-bugs] [Bug 25849] New: Wrong code produced by -fslp-vectorize-aggressive

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Dec 16 00:24:17 PST 2015


            Bug ID: 25849
           Summary: Wrong code produced by -fslp-vectorize-aggressive
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Vsevolod.Livinskij at frtk.ru
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15465
  --> https://llvm.org/bugs/attachment.cgi?id=15465&action=edit

Clang produces incorrect code with -O2 -fslp-vectorize-aggressive options. 
Reproducer fails with FPE:
> clang++ small.cpp -o out -O2 -fslp-vectorize-aggressive
> ./out
Floating point exception (core dumped)

> clang -v
clang version 3.8.0 (trunk 255492)
Target: x86_64-unknown-linux-gnu
Thread model: posix

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