[llvm-bugs] [Bug 41140] New: [MemorySSA] wrong code

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41140

            Bug ID: 41140
           Summary: [MemorySSA] wrong code
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Global Analyses
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 21630
  --> https://bugs.llvm.org/attachment.cgi?id=21630&action=edit
reduced test case

gcc -O3 -march=z13 ./wrong0.i -o a.out -w ; ./a.out
checksum = 2

gcc -O0 -march=z13 ./wrong0.i -o a.out -w ; ./a.out
checksum = 2

bin/clang -O3 -march=z13 ./wrong0.i -o a.out -w ; ./a.out
checksum = 2

bin/clang -O3 -march=z13 ./wrong0.i -o a.out -w -mllvm
-enable-mssa-loop-dependency; ./a.out
checksum = 0


a, f;
*b = &a;
*volatile *c = &b;
static **d = &b;
short e;
main() {
  for (; e <= 1; e++) {
    **c = 2;
    *d = &f;
  }
  printf("checksum = %X\n", a);
}

(also attached)

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