Fix cluster barriers silently trapping on Julia <= 1.11

[AntonOresten]

The cluster barriers use ccall("llvm.nvvm.barrier.cluster.*", llvmcall, ...), which resolves the name against the loaded LLVM. These intrinsics only exist in LLVM 17+, so on Julia 1.10/1.11 the call lowers to a deferred runtime error: the kernel compiles cleanly and traps at launch, with no diagnostic. CI never sees it because the cluster tests require sm_90 hardware, which never runs with Julia 1.11.

Fix: emit them via the full-module llvmcall form (as version.jl does), so the name passes through to the NVPTX back end, with convergent nomerge spelled out since the loaded LLVM can't infer attributes for unknown names (nomerge because SimplifyCFG only learned to not merge convergent calls in LLVM 17).

Also adds a codegen test outside the capability gate — device IR must contain both calls and no gpu_report_exception — so it runs on all CI, including CPU-only. Verified on 1.10/1.11/1.12: IR and sm_90 PTX contain the barriers, and the new test fails on 1.11 without the fix.

Diagnosed by Fable 5

[github-actions]

CUDA.jl Benchmarks

Details

Benchmark suite	Current: 4bf42e6	Previous: fbb9098	Ratio
array/accumulate/Float32/1d	98921 ns	98020 ns	1.01
array/accumulate/Float32/dims=1	74370 ns	73968 ns	1.01
array/accumulate/Float32/dims=1L	1599319 ns	1598577 ns	1.00
array/accumulate/Float32/dims=2	139520 ns	139829 ns	1.00
array/accumulate/Float32/dims=2L	660428 ns	660479 ns	1.00
array/accumulate/Int64/1d	118533 ns	118236 ns	1.00
array/accumulate/Int64/dims=1	78480 ns	78818 ns	1.00
array/accumulate/Int64/dims=1L	1716419 ns	1717142 ns	1.00
array/accumulate/Int64/dims=2	152697 ns	151913 ns	1.01
array/accumulate/Int64/dims=2L	987558 ns	987639 ns	1.00
array/broadcast	18279 ns	18185 ns	1.01
array/construct	1137.1 ns	900.1904761904761 ns	1.26
array/copy	16863 ns	16081 ns	1.05
array/copyto!/cpu_to_gpu	206736 ns	210623 ns	0.98
array/copyto!/gpu_to_cpu	239429 ns	242406 ns	0.99
array/copyto!/gpu_to_gpu	9118.333333333334 ns	8883.666666666666 ns	1.03
array/iteration/findall/bool	132728 ns	132352 ns	1.00
array/iteration/findall/int	146734 ns	146447 ns	1.00
array/iteration/findfirst/bool	68093 ns	67784 ns	1.00
array/iteration/findfirst/int	70171 ns	69220 ns	1.01
array/iteration/findmin/1d	64586 ns	62612 ns	1.03
array/iteration/findmin/2d	99992 ns	99990 ns	1.00
array/iteration/logical	187044 ns	186900 ns	1.00
array/iteration/scalar	62615 ns	62246 ns	1.01
array/permutedims/2d	49363 ns	49143 ns	1.00
array/permutedims/3d	50721 ns	49912 ns	1.02
array/permutedims/4d	50259 ns	50252 ns	1.00
array/random/rand/Float32	12499 ns	10722 ns	1.17
array/random/rand/Int64	23583 ns	20792 ns	1.13
array/random/rand!/Float32	7750.75 ns	7728 ns	1.00
array/random/rand!/Int64	19684 ns	20553 ns	0.96
array/random/randn/Float32	34303 ns	33301 ns	1.03
array/random/randn!/Float32	24761 ns	24939 ns	0.99
array/reductions/mapreduce/Float32/1d	32270 ns	31290 ns	1.03
array/reductions/mapreduce/Float32/dims=1	37691 ns	37312 ns	1.01
array/reductions/mapreduce/Float32/dims=1L	50888 ns	50036 ns	1.02
array/reductions/mapreduce/Float32/dims=2	55141 ns	54292 ns	1.02
array/reductions/mapreduce/Float32/dims=2L	66738 ns	65880 ns	1.01
array/reductions/mapreduce/Int64/1d	39715 ns	39323 ns	1.01
array/reductions/mapreduce/Int64/dims=1	40558 ns	40145 ns	1.01
array/reductions/mapreduce/Int64/dims=1L	88833 ns	87779 ns	1.01
array/reductions/mapreduce/Int64/dims=2	57672 ns	57093 ns	1.01
array/reductions/mapreduce/Int64/dims=2L	83191 ns	82500 ns	1.01
array/reductions/reduce/Float32/1d	32204 ns	31207 ns	1.03
array/reductions/reduce/Float32/dims=1	37749 ns	37284 ns	1.01
array/reductions/reduce/Float32/dims=1L	50828 ns	50034 ns	1.02
array/reductions/reduce/Float32/dims=2	55181 ns	54677 ns	1.01
array/reductions/reduce/Float32/dims=2L	68391 ns	67287 ns	1.02
array/reductions/reduce/Int64/1d	38790 ns	38695 ns	1.00
array/reductions/reduce/Int64/dims=1	40598 ns	39938 ns	1.02
array/reductions/reduce/Int64/dims=1L	88764 ns	87933 ns	1.01
array/reductions/reduce/Int64/dims=2	57598 ns	56801 ns	1.01
array/reductions/reduce/Int64/dims=2L	83253 ns	82417 ns	1.01
array/reverse/1d	17112 ns	16212 ns	1.06
array/reverse/1dL	69807 ns	69012 ns	1.01
array/reverse/1dL_inplace	67036 ns	66891 ns	1.00
array/reverse/1d_inplace	8625.333333333334 ns	9703.666666666666 ns	0.89
array/reverse/2d	20109 ns	19393 ns	1.04
array/reverse/2dL	73428 ns	72842 ns	1.01
array/reverse/2dL_inplace	66857 ns	66766 ns	1.00
array/reverse/2d_inplace	10046 ns	10134 ns	0.99
array/sorting/1d	2650555 ns	2658542 ns	1.00
array/sorting/2d	1038856 ns	1039211 ns	1.00
array/sorting/by	3193540 ns	3193897 ns	1.00
cuda/synchronization/context/auto	1047.7 ns	1040 ns	1.01
cuda/synchronization/context/blocking	801.0652173913044 ns	795.5444444444445 ns	1.01
cuda/synchronization/context/nonblocking	5664.166666666667 ns	5738.666666666667 ns	0.99
cuda/synchronization/stream/auto	897.4090909090909 ns	889.2083333333334 ns	1.01
cuda/synchronization/stream/blocking	684.8053691275168 ns	676.8387096774194 ns	1.01
cuda/synchronization/stream/nonblocking	5522.666666666667 ns	5562.285714285715 ns	0.99
integration/byval/reference	147352 ns	147385 ns	1.00
integration/byval/slices=1	149499 ns	149634 ns	1.00
integration/byval/slices=2	292373 ns	292176 ns	1.00
integration/byval/slices=3	435124 ns	435096 ns	1.00
integration/cudadevrt	104438 ns	104391 ns	1.00
integration/volumerhs	9305196 ns	9304645 ns	1.00
kernel/indexing	12571 ns	12267 ns	1.02
kernel/indexing_checked	13334 ns	13063 ns	1.02
kernel/launch	2004.2 ns	1980.4 ns	1.01
kernel/occupancy	648.2024539877301 ns	638.797619047619 ns	1.01
kernel/rand	15147 ns	14927 ns	1.01
latency/import	3886238524 ns	3890391684 ns	1.00
latency/precompile	4655942183 ns	4668709973 ns	1.00
latency/ttfp	4859468459 ns	4883527794 ns	1.00

This comment was automatically generated by workflow using github-action-benchmark.

[maleadt]

1.11 CI failure needs a JLD2 version bump, I think...

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.42%. Comparing base (bc81d40) to head (4bf42e6).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3188      +/-   ##
==========================================
- Coverage   17.44%   17.42%   -0.03%     
==========================================
  Files         124      124              
  Lines        9883     9883              
==========================================
- Hits         1724     1722       -2     
- Misses       8159     8161       +2     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.