Use WASM f32x4 relaxed min/max for relaxed simd build#24324
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guschmue merged 1 commit intomicrosoft:mainfrom Apr 8, 2025
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Use WASM f32x4 relaxed min/max for relaxed simd build#24324guschmue merged 1 commit intomicrosoft:mainfrom
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@guschmue , Thank you for reviewing this change! This change requires a code review from microsoft/onnxruntime-mlas. @jywu-msft , Could you please help suggest a reviewer or assist in moving it forward? Thank you! |
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### Description Use wasm_f32x4_relaxed_max and wasm_f32x4_relaxed_min in WASM relaxed SIMD build. ### Motivation and Context This PR replaces wasm_f32x4_min/max with the relaxed SIMD counterparts wasm_f32x4_relaxed_min/max in WASM relaxed SIMD build. According to [relaxed SIMD proposal](https://github.com/WebAssembly/relaxed-simd/blob/main/proposals/relaxed-simd/Overview.md#relaxed-min-and-max), the wasm_f32x4_relaxed_min/max allow implementation-defined behavior on NaN propagation and -0.0 vs +0.0. This enables WASM runtimes to use minps/maxps on x64 platforms and improves the performance. e.g. for wasm_f32x4_max -> wasm_f32x4_relaxed_max wasm_f32x4_max: [implementation in V8](https://source.chromium.org/chromium/chromium/src/+/main:v8/src/codegen/shared-ia32-x64/macro-assembler-shared-ia32-x64.cc;l=231) wasm_f32x4_relaxed_max: maxps This change would affect kernel functions rely on MlasMaximumFloat32x4 and MlasMinimumFloat32x4, including various activations and reduced min/max kernels. In mlas micro bench "COMPUTESOFTMAXINPLACE...", this change provides a performance improvement of up to 60% on x64 devices.
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Description
Use wasm_f32x4_relaxed_max and wasm_f32x4_relaxed_min in WASM relaxed SIMD build.
Motivation and Context
This PR replaces wasm_f32x4_min/max with the relaxed SIMD counterparts wasm_f32x4_relaxed_min/max in WASM relaxed SIMD build.
According to relaxed SIMD proposal, the wasm_f32x4_relaxed_min/max allow implementation-defined behavior on NaN propagation and -0.0 vs +0.0. This enables WASM runtimes to use minps/maxps on x64 platforms and improves the performance.
e.g. for wasm_f32x4_max -> wasm_f32x4_relaxed_max
wasm_f32x4_max: implementation in V8
wasm_f32x4_relaxed_max: maxps
This change would affect kernel functions rely on MlasMaximumFloat32x4 and MlasMinimumFloat32x4, including various activations and reduced min/max kernels. In mlas micro bench "COMPUTESOFTMAXINPLACE...", this change provides a performance improvement of up to 60% on x64 devices.