https://bugs.llvm.org/show_bug.cgi?id=40541
Bug ID: 40541
Summary: LLVM 8 stopped optimizing pow(2., x) to exp2(x)
Product: clang
Version: 8.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: dma...@mozilla.com
CC: e.mene...@samsung.com, htmldevelo...@gmail.com,
llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
We noticed this on 32-bit clang-cl builds.
#include <cmath>
float foo(double d) { return pow(2., d / 1200.); }
> d:\clang7.0.1\bin\clang-cl -m32 -O2 -c exp2.cpp
> dumpbin /all exp2.obj | findstr REL32
00000017 REL32 00000000 F _exp2
> d:\clang8rc1\bin\clang-cl -m32 -O2 -c exp2.cpp
> dumpbin /all exp2.obj | findstr REL32
0000002C REL32 00000000 11 _pow
At first glance I'm suspecting a bug in
https://github.com/llvm/llvm-project/commit/2123ea7d5c722e98ce0f047c8baa3fb3db23e6b3.
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