| Issue |
90047
|
| Summary |
User defined SIN function is not called with O3 opt level
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
ararmine
|
When compiling the following example with clang -O3 opt level, the program does not print the expected output, the user defined sin function is not called and the sin library function is called instead. While with -O0 level it works as expected.
Steps to reproduce:
```
cat bug.cpp
#include <stdio.h>
extern "C" double sin(double x) {
printf ("Inside the sin function\n");
return 0.0;
}
int main() {
printf ("Call 1 %f\n", sin(3.3));
printf ("Call 2 %f\n", ::sin(3.3));
}
```
With clang 18.1.0
```
clang++ -O0 bug.cpp
./a.out
Inside the sin function
Call 1 0.000000
Inside the sin function
Call 2 0.000000
clang++ -O3 bug.cpp
./a.out
Inside the sin function
Call 1 -0.157746
Inside the sin function
Call 2 -0.157746
```
When compiling the program with GCC 13.2 , the output is expected with both opt. levels.
```
g++ -O0 bug.cpp
./a.out
Inside the sin function
Call 1 0.000000
Inside the sin function
Call 2 0.000000
g++ -O3 bug.cpp
./a.out
Inside the sin function
Call 1 0.000000
Inside the sin function
Call 2 0.000000
```
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