[sasmith-14]

follow-up to #948: get_backend(::Memory) now returns the POCL backend, but a Memory still can't be passed to a kernel:

@kernel f!(A) = (A[@index(Global)] = 1)
f!(POCLBackend())(Memory{Int}(undef, 4); ndrange = 4)
# ERROR: KernelError: passing non-bitstype argument

only Array gets converted to a device array, so this wraps the Memory in an Array (no copy) and reuses that conversion. views and bits-union eltypes work too. added a "POCL Memory arguments" testset that errors without the change, and the full test suite passes locally.

Claude helped me find this and run the tests; I reviewed the changes.

[github-actions]

Benchmark results

Compared with 8a985320e, the merge base.
Times are the minimum time of every benchmark. A change is unusual when it exceeds both three times the benchmark's typical change between consecutive runs on the default branch and a minimum per category (performance 3%, latency 5%, applications 3%, other 3%). A benchmark that starts or stops allocating is listed however few the allocations. A single run can still be a fluke, so rerun before drawing conclusions.

	Geometric mean	Unusual: slower	Unusual: faster	Compared
Performance	+0.1%	2	0	32
Latency	−1.8%	0	0	13
Applications	+0.5%	0	1	5

Benchmark	Baseline	This PR	Change
Performance
pocl/parallel/groupscan/add-i32	300 µs	424 µs	+41.6%	🔴 slower
pocl/parallel/scheduling/explicit	154 µs	181 µs	+17.9%	🔴 slower
Applications
pocl/parallel/dgsem/weak-node-localmem	146 µs	116 µs	−20.5%	🟢 faster

All benchmarks

Benchmark	Baseline	This PR	Change
Performance
julia/serial/arithmetic/muladd-reference	655 µs	655 µs	+0.0%
julia/serial/math/exp-f64-reference	284 µs	284 µs	+0.0%
julia/serial/narrow/masked-reference	736 µs	711 µs	−3.4%
pocl/parallel/atomics/histogram	5.16 ms	5.15 ms	−0.2%
pocl/parallel/groupreduce/add-f64	1.17 ms	1.17 ms	+0.1%
pocl/parallel/groupreduce/fallback	4.42 ms	4.42 ms	+0.0%
pocl/parallel/groupscan/add-i32	300 µs	424 µs	+41.6%	🔴 slower
pocl/parallel/indexing/cartesian3d	83.7 µs	80.2 µs	−4.1%
pocl/parallel/indexing/linear3d	72.4 µs	77.5 µs	+6.9%
pocl/parallel/indexing/ntuple3d	82.6 µs	80.4 µs	−2.7%
pocl/parallel/indexing/ntuple4d	168 µs	164 µs	−2.7%
pocl/parallel/localmem/transpose-naive	457 µs	453 µs	−0.8%
pocl/parallel/localmem/transpose-tiled	110 µs	97.3 µs	−11.2%
pocl/parallel/private/across-barrier	84.1 µs	83.3 µs	−1.0%
pocl/parallel/scheduling/default	181 µs	181 µs	+0.0%
pocl/parallel/scheduling/explicit	154 µs	181 µs	+17.9%	🔴 slower
pocl/parallel/stream/copy/cache	677 ns	670 ns	−1.0%
pocl/parallel/stream/copy/dram	6.52 ms	6.30 ms	−3.3%
pocl/parallel/stream/triad/cache	7.50 µs	7.16 µs	−4.6%
pocl/parallel/stream/triad/dram	9.47 ms	9.40 ms	−0.8%
pocl/parallel/util/copyto-small	26.0 ns	24.0 ns	−7.7%
pocl/parallel/util/zeros-large	996 µs	996 µs	+0.0%
pocl/parallel/util/zeros-small	643 ns	655 ns	+1.9%
pocl/serial/arithmetic/contract	1.90 ms	1.90 ms	+0.1%
pocl/serial/arithmetic/muladd	765 µs	768 µs	+0.3%
pocl/serial/const/marked	714 µs	733 µs	+2.6%
pocl/serial/const/unmarked	914 µs	914 µs	+0.0%
pocl/serial/math/exp-f64	139 µs	138 µs	−0.2%
pocl/serial/math/sin-f64	210 µs	192 µs	−8.3%
pocl/serial/narrow/masked	797 µs	788 µs	−1.1%
pocl/serial/narrow/unmasked	781 µs	757 µs	−3.0%
pocl/serial/stream/triad/dram	8.67 ms	8.61 ms	−0.7%
Latency
host/import/ka	501 ms	503 ms	+0.3%
host/precompile/ka	39.7 s	39.7 s	+0.1%
host/startup	131 ms	131 ms	−0.0%
pocl/parallel/launch/dynamic-default	4.48 µs	4.44 µs	−0.9%
pocl/parallel/launch/groupreduce-f64	6.53 µs	6.33 µs	−3.1%
pocl/parallel/launch/many-args	12.5 µs	10.7 µs	−14.3%
pocl/parallel/launch/partial-workgroup	4.25 µs	4.20 µs	−1.2%
pocl/serial/compile/groupreduce	1.49 s	1.46 s	−1.5%
pocl/serial/compile/localmem-barrier	710 ms	697 ms	−1.8%
pocl/serial/compile/new-kernel	121 ms	121 ms	−0.4%
pocl/serial/compile/new-workgroupsize	8.79 ms	8.84 ms	+0.6%
pocl/serial/first-kernel/cold-cache	353 ms	350 ms	−0.9%
pocl/serial/first-kernel/warm-cache	275 ms	275 ms	+0.1%
Applications
pocl/parallel/dgsem/fluxdiff-node	289 µs	290 µs	+0.2%
pocl/parallel/dgsem/weak-element	161 µs	207 µs	+28.8%
pocl/parallel/dgsem/weak-node-localmem	146 µs	116 µs	−20.5%	🟢 faster
pocl/parallel/stencil/timestep	8.11 ms	8.08 ms	−0.3%
pocl/serial/stencil/timestep	11.5 ms	11.5 ms	+0.1%

History: https://juliagpu.org/perf/?pkg=kernelabstractions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.19%. Comparing base (8a98532) to head (67d50af).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #957      +/-   ##
==========================================
- Coverage   84.95%   84.19%   -0.76%     
==========================================
  Files          31       31              
  Lines        2612     2563      -49     
==========================================
- Hits         2219     2158      -61     
- Misses        393      405      +12     

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