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: unassignedb...@nondot.org
Reporter: efrie...@codeaurora.org
CC: david.majne...@gmail.com, llvm-bugs@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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