| Issue |
129233
|
| Summary |
[clang] reference gets unnecessarily loaded twice
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
M-Kusumgar
|
test assembly: https://godbolt.org/z/TWdvPPGYs
```c++
#include <stdint.h>
struct foo {
const uint64_t& x;
void f();
uint64_t g() {
uint64_t y = x;
f();
return y * x;
}
};
uint64_t h(foo* x) {
return x->g();
}
```
the reference to x gets loaded twice vs
expected assembly: https://godbolt.org/z/rW39W6h1e
```c++
#include <stdint.h>
struct foo {
const uint64_t& x;
void f();
uint64_t g() {
auto& tmp = x;
uint64_t y = tmp;
f();
return y * tmp;
}
};
uint64_t h(foo* x) {
return x->g();
}
```
the reference to x gets loaded once. shouldn't the compiler be able to optimise the first code block into the assembly produced by the second code block?
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