| Issue |
114856
|
| Summary |
vectorization regression in Clang 19
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
eyelash
|
When compiling the following code on x86-64 with `-O2`
```cpp
void foo(float* result, int size, float y, float delta) {
for (int t = 0; t < size; ++t) {
result[t] = y + delta * t;
}
}
```
It generates a lot of code that seems suboptimal. After [asking on Stack Overflow](https://stackoverflow.com/q/79156564/799849) I was told that this is a regression in Clang 19 that I should report here. The comments and [this answer](https://stackoverflow.com/a/79156703/799849) on Stack Overflow shed more light into what's going on here.
[Here's a link to this example on Compiler Explorer with Clang trunk](https://godbolt.org/z/7Y67cKTfx) that shows the suboptimal assembly.
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