[llvm-bugs] [Bug 47416] New: [x86] Failure to remove all statements in function that doesn't return anything but should

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47416

            Bug ID: 47416
           Summary: [x86] Failure to remove all statements in function
                    that doesn't return anything but should
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: gabravier at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

int f(int a, int b)
{
    if ((a < 4 && b == 'r') || (a == 1 && (b == 'h' || b == 'i')) || (a == 2))
        a = b;
}

Compiling this results in this assembly output:

f(int, int):
  cmp edi, 1

It should be possible to remove the `cmp edi, 1` as far as I know. I guess this
isn't really by itself considering the behaviour is undefined anyway but this
behaviour itself seems rather weird.

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