CP: [SLP][TTI][AMDGPU] Add TTI hook preferSLPInstCountCheck for per-target opt-out#2677
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michaelselehov wants to merge 2 commits into
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CP: [SLP][TTI][AMDGPU] Add TTI hook preferSLPInstCountCheck for per-target opt-out#2677michaelselehov wants to merge 2 commits into
michaelselehov wants to merge 2 commits into
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Reviewers: Pull Request: llvm#199693
…t opt-out (llvm#199696) Add `preferSLPInstCountCheck()` to TTI so targets can opt out of the 2-element inst-count heuristic in `getTreeCost()`. Default returns `true` (existing behavior unchanged). `getTreeCost()` ANDs the existing `SLPInstCountCheck` flag with the hook result. `GCNTTIImpl` returns `false` for gfx940/gfx941/gfx942 and gfx950. Fixes llvm#199662.
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Preemptive cherry pick of PRs llvm#199696 and llvm#199693 from main.