| Issue |
60976
|
| Summary |
Why GCC can optimize call strcmp , but Clang does not ?
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
raidenluikang
|
See result of https://godbolt.org/z/114scaYs1
```
#include <string.h>
#include <stdio.h>
int parse(const char* ptr)
{
if ( ::strcmp(ptr, "s"))
return 42;
if ( ::strcmp(ptr, "ms"))
return 420;
if ( ::strcmp(ptr, "ns"))
return 12;
if ( ::strcmp(ptr, "us"))
return 45;
if ( ::strcmp(ptr, "m"))
return 0;
if (::strcmp(ptr, "h"))
return 5;
return -1;
}
int main()
{
int i = parse("s");
return i;
}
```
GCC produced assembler code doesn't have call strcmp , but Clang call strcmp every time.
Why clang can't optimize call strcmp with compile time string literal ?
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