[llvm-bugs] [Bug 46134] New: Failure to optimize out unnecessary multiplications in conditions

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46134

            Bug ID: 46134
           Summary: Failure to optimize out unnecessary multiplications in
                    conditions
           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

bool f(int a, int b)
{
    return (a * b) && (a * (b + 1));
}

This can be optimized to

bool f(int a, int b)
{
    int tmp = a * b;
    if (!tmp)
        return false;

    return tmp + b;
}

GCC does this transformation, but LLVM does not.

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