Implement Wasm SIMD absolute value instructions for x86#1941
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I'm not really familiar enough with the meta crate to be comfortable being the one to rubber stamp this. Maybe @bnjbvr (when he is feeling better) or @sunfishcode would be better picks? |
This is necessary for implementing SIMD [abs](https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md#lane-wise-integer-absolute-value).
This only covers the types necessary for implementing the Wasm SIMD spec--`i8x16`, `i16x8`, `i32x4`.
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This adds single-instruction encodings (PABSB, PABSW, PABSD) for the Wasm SIMD absolute value instructions.