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vangel76andClaude Opus 5.5
f3df8f34d2
Without simd128, vello_cpu's SIMD layer (fearless_simd) runs its scalar fallback on wasm32. `.cargo/config.toml` now sets `-C target-feature=+simd128` for wasm32-unknown-unknown, which trunk (packaging/web/package.sh) and `cargo xtask wasm` both pick up. A full-frame canvas render of the issue's test drawing in headless Chrome 156 drops from 7.8 to 3.2 ms at 1400 x 900 and from 8.2 to 3.2 ms at 1920 x 1080 (median of 7 and 6 alternating runs on a loaded machine). The canvas pixels are identical. The web build now needs Chrome/Edge 91+, Firefox 89+ or Safari 16.4+; older browsers can no longer load it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
10 lines
425 B
TOML
10 lines
425 B
TOML
[alias]
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xtask = "run --package xtask --"
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# WebAssembly SIMD for the web build: without it vello_cpu's SIMD layer (fearless_simd) runs its
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# scalar fallback on wasm32 and the canvas renders about 2.4x slower (#2786). The web build then
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# needs Chrome/Edge 91+, Firefox 89+ or Safari 16.4+. A RUSTFLAGS environment variable replaces
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# these flags.
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[target.wasm32-unknown-unknown]
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rustflags = ["-C", "target-feature=+simd128"]
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