[llvm-bugs] [Bug 40838] New: Wrong debug info generated at -O1/-O2/-O3 (-O0 is correct)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40838

            Bug ID: 40838
           Summary: Wrong debug info generated at -O1/-O2/-O3 (-O0 is
                    correct)
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Keywords: wrong-debug
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: davide at freebsd.org
                CC: llvm-bugs at lists.llvm.org

$ cat 4.c
typedef int a;
a c, d;
char e;
char(b)(f) { return f; }
int main() {
  c = e;
  a l_1499 = 2922543915;
  l_1499 = b(6);
  l_1499 *d;
  optimize_me_not();
}

$ cat outer.c
void optimize_me_not() {}

(lldb) target create "./a.out"
Current executable set to './a.out' (x86_64).
(lldb) br set -p optimize_me_not
Breakpoint 1: where = a.out`main + 14 at 4.c:10:3, address = 0x000000000040049e
(lldb) r
Process 23400 launched: '/home/davide/finished_reducing/a.out' (x86_64)
Process 23400 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
    frame #0: 0x000000000040049e a.out`main at 4.c:10:3
   7      a l_1499 = 2922543915;
   8      l_1499 = b(6);
   9      l_1499 *d;
-> 10     optimize_me_not();
   11   }
(lldb) frame var l_1499
(a) l_1499 = -1372423381

#####

-O0

(lldb) frame var l_1499
(a) l_1499 = 6

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