| Issue |
78964
|
| Summary |
Comparison of clang and gcc for `(a + b) / pow(a - b, 5)` calculation
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
k-arrows
|
The following simulates a portion of code for a molecular dynamics application (which calculates a certain coefficient).
```cpp
#include <cmath>
double foo(double off, double cut) {
return (off + cut) / pow(off - cut, 5);
}
```
Consider this under `-Ofast`.
https://godbolt.org/z/d7c8s836r
Clang is not the best compared to GCC because it does not make use of `(off + cut)`, which is already calculated. I took Arm as an example, but the same is true for x86.
![]()
_______________________________________________
llvm-bugs mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
