[llvm-bugs] [Bug 44301] New: [JumpThreading] wrong-code

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44301

            Bug ID: 44301
           Summary: [JumpThreading]  wrong-code
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 22935
  --> https://bugs.llvm.org/attachment.cgi?id=22935&action=edit
reduced testcase

gcc -O0 -march=arch13 tc_wrong_jumpthread.i -o a.out -w; ./a.out
checksum = FFFFFFFF

clang -O3 -march=arch13 tc_wrong_jumpthread.i -o a.out -w; ./a.out
checksum = FFFFFFFF

clang -O3 -march=arch13 tc_wrong_jumpthread.i -o a.out -w -mllvm
-jump-threading-across-loop-headers; ./a.out
checksum = 0

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