[llvm-bugs] [Bug 52124] New: Failure to optimize null check after nonnull call

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52124

            Bug ID: 52124
           Summary: Failure to optimize null check after nonnull call
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: gabravier at gmail.com
                CC: llvm-bugs at lists.llvm.org

void f1(void *a) __attribute__((nonnull));

bool g1(void *q) {
  f1(q);
  return q == 0;
}

The return statement can be optimized to `return false;`. This optimization is
done by GCC, but not by LLVM.

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