Update OpenCL headers to v2025.07.22

[SteveBronder]

Summary

This updates the OpenCL C++ library we vendor to v2025.07.22 and fixes a few issues I found in the opencl part of the math library with the upgrade.

Tests

On my machine I was getting small numeric errors for exp_mod_normal_lcdf.hpp, gumbel_cdf.hpp, and std_normal_lcdf.hpp. So I used a bit of claude and updated those to be more numerically stable. For one test I was getting an answer that was off by 1e-7, in the adjoints. So for that I updated the opencl tests so that we could pass a relative error tolerance like we do in the expect_ad testing framework.

Release notes

Update OpenCL C++ to use v2025.07.22

Checklist

• Copyright holder: Steve Bronder

  The copyright holder is typically you or your assignee, such as a university or company. By submitting this pull request, the copyright holder is agreeing to the license the submitted work under the following licenses:
  - Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
  - Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

• the basic tests are passing

  • unit tests pass (to run, use: ./runTests.py test/unit)
  • header checks pass, (make test-headers)
  • dependencies checks pass, (make test-math-dependencies)
  • docs build, (make doxygen)
  • code passes the built in C++ standards checks (make cpplint)

• the code is written in idiomatic C++ and changes are documented in the doxygen

• the new changes are tested

[stan-buildbot]

---

Name	Old Result	New Result	Ratio	Performance change( 1 - new / old )
gp_regr/gp_regr.stan	0.09	0.09	1.01	0.88% faster
gp_regr/gen_gp_data.stan	0.02	0.02	1.0	0.37% faster
arK/arK.stan	1.78	1.82	0.97	-2.61% slower
eight_schools/eight_schools.stan	0.05	0.05	1.02	1.7% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan	8.65	8.51	1.02	1.71% faster
pkpd/one_comp_mm_elim_abs.stan	19.28	18.94	1.02	1.79% faster
pkpd/sim_one_comp_mm_elim_abs.stan	0.24	0.24	1.01	0.7% faster
sir/sir.stan	68.65	67.86	1.01	1.14% faster
gp_pois_regr/gp_pois_regr.stan	2.77	2.8	0.99	-1.05% slower
low_dim_gauss_mix/low_dim_gauss_mix.stan	2.66	2.61	1.02	2.06% faster
irt_2pl/irt_2pl.stan	4.02	3.97	1.01	1.13% faster
arma/arma.stan	0.28	0.28	1.0	-0.38% slower
garch/garch.stan	0.41	0.41	0.98	-1.59% slower
low_dim_corr_gauss/low_dim_corr_gauss.stan	0.01	0.01	0.95	-4.94% slower
performance.compilation	233.85	232.46	1.01	0.6% faster
Mean result: 1.001341982235908

---

Jenkins Console Log
Blue Ocean
Commit hash: e0a54f2c08661b080c37acc67934833d4d8465c6

---

Machine information

No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal

CPU:
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 46 bits physical, 48 bits virtual
CPU(s): 80
On-line CPU(s) list: 0-79
Thread(s) per core: 2
Core(s) per socket: 20
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Gold 6148 CPU @ 2.40GHz
Stepping: 4
CPU MHz: 3366.290
CPU max MHz: 3700.0000
CPU min MHz: 1000.0000
BogoMIPS: 4800.00
Virtualization: VT-x
L1d cache: 1.3 MiB
L1i cache: 1.3 MiB
L2 cache: 40 MiB
L3 cache: 55 MiB
NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78
NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79
Vulnerability Gather data sampling: Mitigation; Microcode
Vulnerability Itlb multihit: KVM: Mitigation: VMX disabled
Vulnerability L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
Vulnerability Mds: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Meltdown: Mitigation; PTI
Vulnerability Mmio stale data: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed: Mitigation; IBRS
Vulnerability Spec rstack overflow: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2: Mitigation; IBRS; IBPB conditional; STIBP conditional; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Vmscape: Mitigation; IBPB before exit to userspace
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single pti intel_ppin ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req pku ospke md_clear flush_l1d arch_capabilities

G++:
g++ (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Clang:
clang version 10.0.0-4ubuntu1
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

[drezap]

And then can you please share the prompt you used? I want to see. Best, Andre Zapico linkedin.com/in/andre-zapico gitub.com/drezap ME Information and Communication Engineering University of Electronic Science and Technology of China Consultant, Owner likely llc likelyllc.com Stan Developer mc-stan.org BS Mathematical Sciences: Probabilistic Methods BS Statistics University of Michigan, Ann Arbor 2017

…

On Thu, Mar 19, 2026 at 11:13 PM Stan buildbot ***@***.***> wrote: *stan-buildbot* left a comment (stan-dev/math#3298) <#3298 (comment)> ------------------------------ Name Old Result New Result Ratio Performance change( 1 - new / old ) gp_regr/gp_regr.stan 0.09 0.09 1.01 0.88% faster gp_regr/gen_gp_data.stan 0.02 0.02 1.0 0.37% faster arK/arK.stan 1.78 1.82 0.97 -2.61% slower eight_schools/eight_schools.stan 0.05 0.05 1.02 1.7% faster low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan 8.65 8.51 1.02 1.71% faster pkpd/one_comp_mm_elim_abs.stan 19.28 18.94 1.02 1.79% faster pkpd/sim_one_comp_mm_elim_abs.stan 0.24 0.24 1.01 0.7% faster sir/sir.stan 68.65 67.86 1.01 1.14% faster gp_pois_regr/gp_pois_regr.stan 2.77 2.8 0.99 -1.05% slower low_dim_gauss_mix/low_dim_gauss_mix.stan 2.66 2.61 1.02 2.06% faster irt_2pl/irt_2pl.stan 4.02 3.97 1.01 1.13% faster arma/arma.stan 0.28 0.28 1.0 -0.38% slower garch/garch.stan 0.41 0.41 0.98 -1.59% slower low_dim_corr_gauss/low_dim_corr_gauss.stan 0.01 0.01 0.95 -4.94% slower performance.compilation 233.85 232.46 1.01 0.6% faster Mean result: 1.001341982235908 ------------------------------ Jenkins Console Log <https://jenkins.flatironinstitute.org/job/Stan/job/Math/view/change-requests/job/PR-3298/3/consoleFull> Blue Ocean <https://jenkins.flatironinstitute.org/blue/organizations/jenkins/Stan%2FMath/detail/PR-3298/3/pipeline> Commit hash: e0a54f2c08661b080c37acc67934833d4d8465c6 ------------------------------ Machine information No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal CPU: Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian Address sizes: 46 bits physical, 48 bits virtual CPU(s): 80 On-line CPU(s) list: 0-79 Thread(s) per core: 2 Core(s) per socket: 20 Socket(s): 2 NUMA node(s): 2 Vendor ID: GenuineIntel CPU family: 6 Model: 85 Model name: Intel(R) Xeon(R) Gold 6148 CPU @ 2.40GHz Stepping: 4 CPU MHz: 3366.290 CPU max MHz: 3700.0000 CPU min MHz: 1000.0000 BogoMIPS: 4800.00 Virtualization: VT-x L1d cache: 1.3 MiB L1i cache: 1.3 MiB L2 cache: 40 MiB L3 cache: 55 MiB NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78 NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79 Vulnerability Gather data sampling: Mitigation; Microcode Vulnerability Itlb multihit: KVM: Mitigation: VMX disabled Vulnerability L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable Vulnerability Mds: Mitigation; Clear CPU buffers; SMT vulnerable Vulnerability Meltdown: Mitigation; PTI Vulnerability Mmio stale data: Mitigation; Clear CPU buffers; SMT vulnerable Vulnerability Reg file data sampling: Not affected Vulnerability Retbleed: Mitigation; IBRS Vulnerability Spec rstack overflow: Not affected Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization Vulnerability Spectre v2: Mitigation; IBRS; IBPB conditional; STIBP conditional; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected Vulnerability Srbds: Not affected Vulnerability Tsx async abort: Mitigation; Clear CPU buffers; SMT vulnerable Vulnerability Vmscape: Mitigation; IBPB before exit to userspace Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single pti intel_ppin ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req pku ospke md_clear flush_l1d arch_capabilities G++: g++ (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0 Copyright (C) 2019 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Clang: clang version 10.0.0-4ubuntu1 Target: x86_64-pc-linux-gnu Thread model: posix InstalledDir: /usr/bin — Reply to this email directly, view it on GitHub <#3298?email_source=notifications&email_token=ACY543AKIDD6ET4IPJRGEHD4RSZOXA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIMBZGUYTKMRXG4Y2M4TFMFZW63VKON2WE43DOJUWEZLEUVSXMZLOOSWGM33PORSXEX3DNRUWG2Y#issuecomment-4095152771>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACY543EH5GQN424D6G25VC34RSZOXAVCNFSM6AAAAACWYM7SH6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DAOJVGE2TENZXGE> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>