[Perf]optimize the flash attention fp8 performance for gfx950 - #950
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xudoyuan
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Aug 3, 2026
Resolve flash_attn_utils.py conflict: keep main's #950 vectorized _score_pair_sum / _scale_sub_score_pair, expressed in this branch's DSL style (operators + fx.fma instead of fmath.fma / _fadd/_fsub/_fmul). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Motivation
optimize the flash attention fp8 performance for gfx950 to close the gap between aiter asm
Test Result
batch=4, H=32, D=128, FP8, MI355X