| Issue |
129203
|
| Summary |
[register] clang use redundant mov to avoid clobber return register w0
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
vfdff
|
* test: https://godbolt.org/z/PG9GoMnqo
```
typedef struct {
int a;
int b;
} S;
extern S g_info;
__attribute__((noinline))
int foo1(S * s)
{
int start = g_info.a;
s->b = 0;
return g_info.a;
}
```
* Now gcc store the s->b first and then can load g_info.a into return regiser w0 without redundant mov
While clang need the redundant mov as it load g_info.a first, and the register w0 is not released.
- I already use -Wall to report all warning, but the **dangling pointer** is not identified by clang
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