Fix GPU example, compiler matrix, and AMD flang in CLAUDE.md docs#1256
Fix GPU example, compiler matrix, and AMD flang in CLAUDE.md docs#1256sbryngelson merged 1 commit intomasterfrom
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- Replace misleading GPU_PARALLEL+GPU_LOOP example with real GPU_PARALLEL_LOOP pattern (750+ uses in codebase); add warning that GPU_LOOP emits empty directives on Cray/AMD compilers - Mark Intel ifx and GNU gfortran as Experimental for --gpu mp (CMake has code paths but not CI-tested or fully supported) - Clarify AMD flang as additionally supported but not CI-gated, consistently across CLAUDE.md, common-pitfalls.md, gpu-and-mpi.md - Clarify GPU_PARALLEL is for scalar reductions, not spatial loops Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThis PR updates documentation across three files to reflect changes in compiler support and GPU macro usage patterns. Updates include establishing a CI-gated compiler list (gfortran, nvfortran, Cray ftn, Intel ifx), adding AMD flang GPU support notes, and clarifying GPU_PARALLEL_LOOP macro guidance with deprecation of older block patterns. Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Possibly related PRs
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In @.claude/rules/gpu-and-mpi.md:
- Around line 78-79: The sentence "AMD flang is additionally supported for GPU
builds" is imprecise; update the prose in `.claude/rules/gpu-and-mpi.md` to
explicitly limit AMD flang support to OpenMP target/offload GPU builds (i.e.,
`--gpu mp` / OpenMP target offload), matching the table and the sibling docs
(`common-pitfalls.md`, `CLAUDE.md`); replace the broad phrase with wording such
as "AMD flang is supported only for OpenMP target (--gpu mp) GPU/offload builds"
so the text and table are consistent.
| CI-gated compilers (must always pass): gfortran, nvfortran, Cray ftn, Intel ifx. | ||
| AMD flang is additionally supported for GPU builds but not in the CI matrix. |
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Minor imprecision in AMD flang scope description.
Line 79 says AMD flang is additionally supported for GPU builds, but AMD flang is No for --gpu acc (see the table immediately below). The sibling files are more precise: common-pitfalls.md says `--gpu mp` builds and CLAUDE.md says OpenMP target offload GPU builds. A reader skimming the prose without the table could infer broader GPU coverage than is actually supported.
✏️ Suggested wording fix
-AMD flang is additionally supported for GPU builds but not in the CI matrix.
+AMD flang is additionally supported for OpenMP target offload (`--gpu mp`) builds but not in the CI matrix.📝 Committable suggestion
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Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| CI-gated compilers (must always pass): gfortran, nvfortran, Cray ftn, Intel ifx. | |
| AMD flang is additionally supported for GPU builds but not in the CI matrix. | |
| CI-gated compilers (must always pass): gfortran, nvfortran, Cray ftn, Intel ifx. | |
| AMD flang is additionally supported for OpenMP target offload (`--gpu mp`) builds but not in the CI matrix. |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In @.claude/rules/gpu-and-mpi.md around lines 78 - 79, The sentence "AMD flang
is additionally supported for GPU builds" is imprecise; update the prose in
`.claude/rules/gpu-and-mpi.md` to explicitly limit AMD flang support to OpenMP
target/offload GPU builds (i.e., `--gpu mp` / OpenMP target offload), matching
the table and the sibling docs (`common-pitfalls.md`, `CLAUDE.md`); replace the
broad phrase with wording such as "AMD flang is supported only for OpenMP target
(--gpu mp) GPU/offload builds" so the text and table are consistent.
There was a problem hiding this comment.
Pull request overview
This PR corrects inaccuracies in the CLAUDE.md documentation and related rule files regarding GPU programming patterns, compiler support, and AMD flang's role in the project. The changes ensure documentation accurately reflects the codebase's actual implementation patterns and CI requirements.
Changes:
- Replaced a non-existent GPU macro pattern with the actual
GPU_PARALLEL_LOOPpattern used 750+ times in the codebase - Updated compiler-backend matrix to mark Intel ifx and GNU gfortran as "Experimental" for GPU builds instead of "No"
- Clarified AMD flang as additionally supported for GPU builds but not CI-gated, resolving inconsistency across all three documentation files
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| CLAUDE.md | Added AMD flang clarification and updated compiler portability statement |
| .claude/rules/gpu-and-mpi.md | Replaced GPU example with real pattern, updated compiler matrix, and added AMD flang context |
| .claude/rules/common-pitfalls.md | Clarified CI-gated compilers and AMD flang support |
Claude Code Review
3 files changed:
Summary of changes
FindingsIssue 1 — AMD flang IS CI-gated (documentation contradicts the actual CI configuration)Files: CLAUDE.md (line 7), .claude/rules/common-pitfalls.md (line 40), .claude/rules/gpu-and-mpi.md (line 79) All three modified files now state that AMD flang is "additionally supported for GPU builds but not in the CI matrix." This is factually incorrect. .github/workflows/test.yml includes two frontier_amd matrix entries in the self job (lines 194-200): - runner: 'frontier'
cluster: 'frontier_amd'
cluster_name: 'Oak Ridge | Frontier (AMD)'
device: 'gpu'
interface: 'omp'
- runner: 'frontier'
cluster: 'frontier_amd'
cluster_name: 'Oak Ridge | Frontier (AMD)'
device: 'cpu'
interface: 'none'The self job has continue-on-error: false (line 156), so AMD flang failures on Frontier do block PRs — same as the other four CI-gated compilers. AMD flang should be listed alongside gfortran, nvfortran, Cray ftn, and Intel ifx as a CI-gated compiler in all three files. Issue 2 — Intel ifx "CI-gated" vs "Experimental (SPIR64)" creates a misleading contradictionFile: .claude/rules/gpu-and-mpi.md The new preamble states: "CI-gated compilers (must always pass): gfortran, nvfortran, Cray ftn, Intel ifx." The matrix table then marks Intel ifx + --gpu mp as "Experimental (SPIR64)". However, the CI workflow has no Intel GPU runner and never invokes --gpu mp for ifx — Intel ifx is only tested in CPU-only mode. A developer reading "CI-gated (must always pass)" could reasonably conclude that Intel ifx GPU builds are also gated, which is incorrect. The preamble or table should clarify that "CI-gated" for Intel ifx means CPU-only builds only. Improvement opportunities
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User description
Summary
Follow-up to #1255. Fixes accuracy issues found during review of the CLAUDE.md and
.claude/rules/documentation:GPU_PARALLEL+GPU_LOOPblock macro example showed a pattern not used anywhere in the codebase (0 occurrences). Replaced with the realGPU_PARALLEL_LOOP/END_GPU_PARALLEL_LOOPpattern (750+ occurrences across 33 files). Added warning thatGPU_LOOPemits empty directives on Cray and AMD compilers, causing silent serial execution.--gpu mp(CMake has code paths but they're not CI-tested). Previously marked as "No" despite CMake support.Test plan
🤖 Generated with Claude Code
CodeAnt-AI Description
Fix GPU example and clarify compiler/GPU support across docs
What Changed
Impact
✅ Clearer GPU loop guidance✅ Fewer silent serial executions on Cray/AMD✅ Clearer compiler support and CI expectations💡 Usage Guide
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