| Issue |
91710
|
| Summary |
lower performance of frequent jumps with goto statements
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
bi6c
|
```c
#include <stdint.h>
static uint32_t a = 0x466AC3A6L;
int main (int argc, char* argv[])
{
p1:
a--;
if (a)
goto p1;
}
```
Hello, we are using clang to compile the above code in Ubuntu 22.04.3 LTS.
When the value of `a` increases, the execution time difference also increases when we compile it with llvmorg-13.0.0 and llvmorg-19-init. The execution time result of above code is shown below.
```
~/compiler-builds/llvmorg-13.0.0_build/bin/clang test.c -o exec1
time ./exec1
real 0m0.276s
user 0m0.276s
sys 0m0.000s
~/compiler-builds/llvmorg-19-init_build/bin/clang test.c -o exec2
time ./exec2
real 0m1.738s
user 0m1.738s
sys 0m0.000s
```
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