[llvm-bugs] [Bug 25276] New: csmith fuzz testcase incorrectness on -O1+ without LLVM optimizations

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25276

            Bug ID: 25276
           Summary: csmith fuzz testcase incorrectness on -O1+ without
                    LLVM optimizations
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: alonzakai at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15134
  --> https://llvm.org/bugs/attachment.cgi?id=15134&action=edit
testcase

Attached is a csmith fuzz testcase that fails when clang is given -O1, *even
without LLVM optimizations*, so it seems like the issue is in clang and not the
LLVM optimizer?

clang newfail_27643_1.cpp -O0 -emit-llvm -o a.bc -c -w -disable-llvm-optzns ;
clang a.bc ; ./a.out

gives the same result as gcc, while replacing -O0 with -O1 in that command
yields a different and incorrect output.

tested on latest trunk as of right now,

=====
commit 333aedbc24d97c7927193a261a71491d69b77225
Author: Yaron Keren <yaron.keren at gmail.com>
Date:   Wed Oct 21 18:16:01 2015 +0000

    Rename clang config.h include guard from CONFIG_H to CLANG_CONFIG_H
    to make it different from LLVM config.h include guard.

    git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@250921
91177308-0d34-0410-b5e6-96231b3b80d8

=====
commit ba3f35ef578512993618c7e961bdd9132a8863f2
Author: Yaron Keren <yaron.keren at gmail.com>
Date:   Wed Oct 21 18:36:52 2015 +0000

    Revert r250923 as config.h is not an installed header.

    git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@250924
91177308-0d34-0410-b5e6-96231b3b80d8
=====

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