[llvm-bugs] [Bug 38458] New: -sin(-x) -> sin(x)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38458

            Bug ID: 38458
           Summary: -sin(-x) -> sin(x)
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: david.bolvansky at gmail.com
                CC: llvm-bugs at lists.llvm.org

-sin(-x) can be simplified to sin(x)

double sinrev(double x)
{
    return -sin(-x);
}


Current code gen:
sinrev(double): 
        push    rax
        xorps   xmm0, xmmword ptr [rip + .LCPI0_0]
        call    sin
        xorps   xmm0, xmmword ptr [rip + .LCPI0_0]
        pop     rax
        ret

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