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Build # 1366

Build Type

push

buildkite

Committed by

web-flow

Commit Message

codegen: implement `sret_union` ABI for pointer-ful types (#55045)

This effectively expands our existing `union` ABI to cover both of these
existing cases:
 - `sret`  ABI (which can stack-allocate a _single pointer-ful_ type)
 - `union` ABI (which can stack-allocate _many pointer-free_ types)

This provides some nice speed-ups for temporary "wrappers":
```julia
const v = Any[]
@noinline maybe_wrapped(i) = (i % 32 != 0) ? Some(v) : nothing
function foo()
    count = 0
    for i = 1:1_000_000
        count += (maybe_wrapped(i) !== nothing) ? 1 : 0
    end
    return count
end
```

On this PR this gives:
```julia
julia> @btime foo()
  1.675 ms (0 allocations: 0 bytes)
968750
```

compared to current master:
```julia
julia> @btime foo()
  6.877 ms (968750 allocations: 14.78 MiB)
968750
```

Co-authored-by: Gabriel Baraldi <baraldigabriel@gmail.com>
Co-authored-by: Jameson Nash <vtjnash@gmail.com>

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