[GSan][FPSan] Fix sanitizer correctness and performance#10561
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Rebase draft PR #10561 onto the updated stack.
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PR description written by Codex Load shared MMA operands directly into their result layouts and reuse existing scale shadows, avoiding redundant layout conversions and scale snapshots, and also load accumulator directly into its MMA layout. ## Stack Merge bottom-up: - [x] #10472 - [x] #10473 - [ ] #10527 (this PR) - [ ] #10532 - [ ] #10533 - [ ] #10542 - [ ] #10548 - [ ] #10561 - [ ] #10559
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PR description written by Codex Optimize i8 decomposition by reordering the dots and eagerly combining into the accumulator-on-the-fly to minimize register pressure, and include a basic subtiling heuristic determined experimentally ## Stack Merge bottom-up: - [x] #10472 - [x] #10473 - [x] #10527 - [x] #10532 - [ ] #10533 (this PR) - [ ] #10542 - [ ] #10548 - [ ] #10561 - [ ] #10559
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PR description written by Codex Fix FPSAN TMEM emulation for initialized scratch synchronization, predicated stores, reduction loads, and scale-copy reinterpret views. ## Stack Merge bottom-up: - [x] #10472 - [x] #10473 - [x] #10527 - [x] #10532 - [x] #10533 - [ ] #10542 (this PR) - [ ] #10548 - [ ] #10561 - [ ] #10559
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PR description written by Codex Remove redundant payload sign clears before masked multiplies so NVPTX cannot fold them to `abs.f32`, which quiets signaling NaNs. Add a reduced one-warp regression that fails bitwise on PR #10542’s base and passes with the fix. ## Stack Merge bottom-up: - [x] #10472 - [x] #10473 - [x] #10527 - [x] #10532 - [x] #10533 - [x] #10542 - [ ] #10548 (this PR) - [ ] #10561 - [ ] #10559
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PR description written by Codex
Stacked on #10548. Adds GSan correctness fixes and FPSan Blackwell support, including optimized f32 and f64 exp2 instrumentation.
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