[llvm-bugs] [Bug 45685] New: Failure to optimize away multiplication when right operand is not 0

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45685

            Bug ID: 45685
           Summary: Failure to optimize away multiplication when right
                    operand is not 0
           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

int f(int a, int b, int c)
{
    __builtin_assume(c != 0);
    a *= c;
    b *= c;
    return a == b;
}

This could all be optimized into `a == b` since `c != 0`. This transformation
is done by GCC, but not by LLVM.

Comparison here : https://godbolt.org/z/SMWp9P

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