https://bugs.llvm.org/show_bug.cgi?id=47064
Bug ID: 47064
Summary: Failure to optimize multiplication by copysign to abs
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: gabrav...@gmail.com
CC: llvm-bugs@lists.llvm.org
float f(float x)
{
return x * copysignf(1.0f, x);
}
This can be optimized to `fabsf(x);`. This transformation is done by GCC, but
not by LLVM. Similar transformations can also be done, such as `x *
copysignf(1.0f, -x)` -> `-fabsf(x)`, and are done by GCC, but not by LLVM.
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