https://bugs.llvm.org/show_bug.cgi?id=49147
Bug ID: 49147
Summary: [FastMath] Failure to fold 1 / powf(x,y) -> powf(x,
-y)
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: llvm-bugs@lists.llvm.org
#include <cmath>
float invpow_i(float x, int y) {
return 1.0f / __builtin_powf(x, y);
}
float invpow_f(float x, float y) {
return 1.0f / __builtin_powf(x, y);
}
https://simd.godbolt.org/z/YxaW96
Clang fails to merge the fdiv into the pow by negating the exponent arg
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