1541
77%
master: 77%

Ran 09 Dec 2025 10:43AM UTC

Jobs 3

Files 350

Run time 1min

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Committed 08 Dec 2025 04:29PM UTC coverage: 76.699% (-0.04%) from 76.74%

Build # 1541

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>

Run Details

62469 of 81447 relevant lines covered (76.7%)

22102469.65 hits per line

Uncovered Existing Lines

Lines	Coverage	∆	File
1	90.21	-0.52%	base/asyncevent.jl
2	68.68	0.38%	base/errorshow.jl
7	82.49	-0.25%	Compiler/src/abstractinterpretation.jl
8	92.06	-2.89%	base/strings/string.jl
11	71.62	-0.24%	base/show.jl
26	66.83	-12.5%	base/strings/annotated_io.jl

Jobs

ID	Job ID	Ran	Files	Coverage
1541	linux-coverage - 1541	09 Dec 2025 01:26PM UTC	349	75.71
1541	windows-coverage - 1541	09 Dec 2025 02:40PM UTC	319	74.94
1541	macos-coverage - 1541	09 Dec 2025 10:43AM UTC	350	74.87

JuliaLang / julia / 1541
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master: 77%

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