[libspirv] Convert __assert_fail.ll and image_helpers.ll to CL files by wenju-he · Pull Request #21547 · intel/llvm

wenju-he · 2026-03-18T00:21:20Z

LLVM IR (.ll) files doesn't work with cmake add_library change in libclc.

image_helpers.cl PTX output verified against reference PTX generated from image_helpers.ll.
Bindless image tests passed (no regressions) on NV 2060.

LLVM IR (.ll) files doesn't work with cmake add_library change in libclc. __assert_fail.cl: - Implemented __strlen_assert helper using pointer arithmetic - Built error message string using OCKL fprintf functions - Retrieved work-item IDs using __oclc_get_* builtins - Used __builtin_trap() to halt execution after assertion image_helpers.cl: - Converted ~105 image_helpers functions from LLVM intrinsics to inline PTX asm - Inline assembly + union-based type conversion gets fully optimized - Compiler eliminates conversion entirely (identical memory layout) - Direct register-to-register operation, no function calls - Eliminates ~105 function call sites and associated memory operations - PTX output verified against reference PTX generated from image_helpers.ll Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Maetveis

LGTM to me in general, with some questions.
I'm trusting you verified that the implementations still work, I didn't go over the inline PTX line-by-line to check it against the llvm intrinsic calls.

libclc/libspirv/lib/ptx-nvidiacl/images/image_helpers.cl

libclc/libspirv/lib/amdgcn-amdhsa/assert/__assert_fail.cl

libclc/libspirv/lib/ptx-nvidiacl/images/image_helpers.cl

Maetveis · 2026-03-18T08:00:18Z

__assert_fail.cl:

Implemented __strlen_assert helper using pointer arithmetic

Built error message string using OCKL fprintf functions

Retrieved work-item IDs using __oclc_get_* builtins

Used __builtin_trap() to halt execution after assertion

@wenju-he is the PR description AI generated? Have you double-checked it is accurate? The last two bullets are not true AFAICT.

libclc/libspirv/lib/amdgcn-amdhsa/assert/__assert_fail.cl

wenju-he · 2026-03-18T08:33:02Z

__assert_fail.cl:

Implemented __strlen_assert helper using pointer arithmetic

Built error message string using OCKL fprintf functions

Retrieved work-item IDs using __oclc_get_* builtins

Used __builtin_trap() to halt execution after assertion

@wenju-he is the PR description AI generated? Have you double-checked it is accurate? The last two bullets are not true AFAICT.

yes, it is AI generated.

wenju-he · 2026-03-18T08:36:59Z

I'm trusting you verified that the implementations still work

Only verified on CUDA bindless image. We don't have AMDGPU to verify with.

libclc/libspirv/lib/amdgcn-amdhsa/assert/__assert_fail.cl

Maetveis · 2026-03-18T09:36:24Z

I'm trusting you verified that the implementations still work

Only verified on CUDA bindless image. We don't have AMDGPU to verify with.

Okay, I went ahead and reviewed the AMDGPU change against the llvm-ir file. I have some comments and suggestions, see them above.

Maetveis · 2026-03-18T09:37:13Z

__assert_fail.cl:

Implemented __strlen_assert helper using pointer arithmetic

Built error message string using OCKL fprintf functions

Retrieved work-item IDs using __oclc_get_* builtins

Used __builtin_trap() to halt execution after assertion

@wenju-he is the PR description AI generated? Have you double-checked it is accurate? The last two bullets are not true AFAICT.

yes, it is AI generated.

Could you please update it to be accurately reflect the changes done after applying suggestions?

libclc/libspirv/lib/amdgcn-amdhsa/assert/__assert_fail.cl

Co-authored-by: Mészáros Gergely <maetveis@gmail.com> Co-authored-by: Wenju He <wenju.he@intel.com>

wenju-he · 2026-03-18T09:55:41Z

__assert_fail.cl:

Implemented __strlen_assert helper using pointer arithmetic

Built error message string using OCKL fprintf functions

Retrieved work-item IDs using __oclc_get_* builtins

Used __builtin_trap() to halt execution after assertion

@wenju-he is the PR description AI generated? Have you double-checked it is accurate? The last two bullets are not true AFAICT.

yes, it is AI generated.

Could you please update it to be accurately reflect the changes done after applying suggestions?

Done

Maetveis · 2026-03-18T09:59:34Z

Could you please update it to be accurately reflect the changes done after applying suggestions?
Done

I would remove these too as some of them are inacurrate and the others not relevant IMO.

Inline assembly + union-based type conversion gets fully optimized

Compiler eliminates conversion entirely (identical memory layout)

Direct register-to-register operation, no function calls

Eliminates ~105 function call sites and associated memory operations

libclc/libspirv/lib/ptx-nvidiacl/images/image_helpers.cl

libclc/libspirv/lib/amdgcn-amdhsa/assert/__assert_fail.cl

Maetveis

LGTM.

Co-authored-by: Mészáros Gergely <maetveis@gmail.com>

libclc/libspirv/lib/amdgcn-amdhsa/assert/__assert_fail.cl

Co-authored-by: Wenju He <wenju.he@intel.com>

wenju-he · 2026-03-18T10:32:05Z

I would remove these too as some of them are inacurrate and the others not relevant IMO.

Inline assembly + union-based type conversion gets fully optimized

Compiler eliminates conversion entirely (identical memory layout)

Direct register-to-register operation, no function calls

Eliminates ~105 function call sites and associated memory operations

done, removed.

…l_id.h And remove extra declaration from __assert_fail.cl.

Maetveis · 2026-03-18T10:53:37Z

@wenju-he I've pushed a commit to fix needing to declare __spirv_BuiltInGlobalInvocationId in __assert_fail.cl. I thought it will be quicker and easier than giving you a patch. That was the last thing I had in here, the rest looks all good.
Thank you for the work, and for sticking through the review, I realize it took a few iterations :).

wenju-he · 2026-03-18T10:58:17Z

@wenju-he I've pushed a commit to fix needing to declare __spirv_BuiltInGlobalInvocationId in __assert_fail.cl. I thought it will be quicker and easier than giving you a patch. That was the last thing I had in here, the rest looks all good. Thank you for the work, and for sticking through the review, I realize it took a few iterations :).

thanks you for the detailed review

wenju-he · 2026-03-19T00:55:46Z

@intel/llvm-gatekeepers please merge, thanks. GEN12 fail is unrelated because this PR only affect AMDGPU and CUDA.

wenju-he requested review from a team and Maetveis as code owners March 18, 2026 00:21

wenju-he requested a review from kekaczma March 18, 2026 00:21

Maetveis approved these changes Mar 18, 2026

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wenju-he commented Mar 18, 2026

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wenju-he and others added 2 commits March 18, 2026 17:42

Apply suggestions from code review

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Co-authored-by: Mészáros Gergely <maetveis@gmail.com> Co-authored-by: Wenju He <wenju.he@intel.com>

__builtin_bit_cast, clang-format

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Use vector types directly in image_helpers.cl

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Update libclc/libspirv/lib/amdgcn-amdhsa/assert/__assert_fail.cl

eab352e

Co-authored-by: Mészáros Gergely <maetveis@gmail.com>

wenju-he commented Mar 18, 2026

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Apply suggestions from code review

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Co-authored-by: Wenju He <wenju.he@intel.com>

[libclc] Fix __spirv_BuiltInGlobalInvocationId decl name in get_globa…

e4a122c

…l_id.h And remove extra declaration from __assert_fail.cl.

Fix tex.2d.v4j32.s32 output type: s32 -> u32

d5fce10

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