| Issue |
52891
|
| Summary |
Calls to functions which may change the state of the floating-point environment may be optimized out
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
PavelMorozkin
|
Sample code:
```
#include <fenv.h>
#include <math.h>
#if __STDC__ == 1 && __STDC_IEC_559__ == 1
#pragma STDC FENV_ACCESS ON
int main(void)
{
sin(0.5);
return fetestexcept(FE_INEXACT) ? 0 : 1;
}
#endif
```
Options: `-O1 -std=c11 -pedantic -Wall -Wextra -lm -ffp-model=strict`
Generated code:
```
main: # @main
push rax
mov edi, 32
call fetestexcept
```
Here we see that `call sin` was incorrectly optimized out.
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