| Issue |
58128
|
| Summary |
Load unnecessarily happens before malloc
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
jrmuizel
|
The following code will be compiled with the load of `next` happening before the call to `malloc`. This generates worse code than if the load is delayed until after the call to `malloc`.
```c
struct Foo {
Foo* next;
};
void ctx_push(Foo* f) {
Foo tmp = { f->next };
Foo *n = (Foo*)malloc(sizeof(Foo));
*n = tmp;
f->next = n;
}
```
Manually moving the load in this example improves the generated code:
```c
struct Foo {
Foo* next;
};
void ctx_push(Foo* f) {
Foo *n = (Foo*)malloc(sizeof(Foo));
Foo tmp = { f->next };
*n = tmp;
f->next = n;
}
```
https://gcc.godbolt.org/z/jKvWEfvdc
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