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Update the SIMD proposal after the May 2017 community group meeting #22
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added 6 commits
June 6, 2017 10:50
The WebAssembly community group was not able to reach a consensus on whether boolean vector types should be included or not. In order to move forward with prototyping of the proposal, remove the boolean vector types along with supporting instructions. Change comparison instructions to return a v128 mask vector and replace the select instructions with a single v128.bitselect instruction. These semantics are simply to implement on all current instruction set architectures.
Remove all other swizzle and shuffle instructions since they can be implemented in terms of the general v8x16.shuffle. We can add more compact encodings of popular shuffles later if needed.
The CG consensus is to omit the following i64x2 operations: i64x2.mul, equalities, inequalities. Other i64x2 operations remain since they were supported by CG consensus.
The CG consensus was to replace the trapping conversion instructions with saturating semantics.
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This takes the number of instructions down to 140.