[llvm-bugs] [Bug 30464] New: LLVM fails to DCE constant-folded calls to math functions

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30464

            Bug ID: 30464
           Summary: LLVM fails to DCE constant-folded calls to math
                    functions
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: efriedma at codeaurora.org
                CC: david.majnemer at gmail.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Testcase:

#include <math.h>
void f() { exp(1.0); }

On x86-64 Linux, clang -O2 doesn't eliminate the call to exp().  (LLVM can
prove it's dead even with -fmath-errno because the result doesn't overflow.)

I think this is a regression from r276389.

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