[llvm-bugs] [Bug 31567] New: Canonicalize C99 cos(x) -> @llvm.cos in SimplifyLibCalls

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31567

            Bug ID: 31567
           Summary: Canonicalize C99 cos(x) -> @llvm.cos in
                    SimplifyLibCalls
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: davide at freebsd.org
                CC: llvm-bugs at lists.llvm.org, llvm-dev at redking.me.uk,
                    simon.f.whittaker at gmail.com
    Classification: Unclassified

We already do simplification on the intrinsic in InstCombine, e.g.
cos(-x) -> cos(x)
cos(fabs(x)) -> cos(x)

If we lower C99 cos(x) -> @llvm.cos we don't need to do the same simplifcations
in SimplifyLibCalls.

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