krzysz00 wrote:
@jayfoad
> High level question: I don't understand why you call this a "gather"
> operation. What do you mean by that? Isn't it semantically just a memcpy, or
> a (global/buffer) load followed by a (LDS) store?
The semantics of this operation (at least in the pre-gfx950 cases) are
```
lds_load(vector globalAddr, scalar ldsAddr) {
lds[ldsAddr + 4 * laneId] = global[globalAddr];
}
```
Note that your lane-varying global address can point all over memory, but that
the values to written to LDS always go at base, base + 4 bytes, base + 8 bytes,
... base + (wavesize - 1) * 4 bytes
>From where I'm standing, this is a gather
https://github.com/llvm/llvm-project/pull/137425
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