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Add saturating subtraction with a SIMD encoding

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This includes the new instructions `ssub_sat` and `usub_sat` and only encodes the i8x16 and i16x8 types; these are what is needed for implementing the SIMD spec (see https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md#saturating-integer-subtraction).
This commit is contained in:
Andrew Brown
2019-09-18 16:28:13 -07:00
parent 21144068d4
commit 90c49a2f7c
5 changed files with 102 additions and 4 deletions
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12
cranelift/wasm/src/code_translator.rs
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@@ -1012,6 +1012,14 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
let (a, b) = state.pop2();
state.push1(builder.ins().isub(a, b))
}
Operator::I8x16SubSaturateS | Operator::I16x8SubSaturateS => {
let (a, b) = state.pop2();
state.push1(builder.ins().ssub_sat(a, b))
}
Operator::I8x16SubSaturateU | Operator::I16x8SubSaturateU => {
let (a, b) = state.pop2();
state.push1(builder.ins().usub_sat(a, b))
}
Operator::I8x16Neg | Operator::I16x8Neg | Operator::I32x4Neg | Operator::I64x2Neg => {
let a = state.pop1();
state.push1(builder.ins().ineg(a))
@@ -1072,16 +1080,12 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
| Operator::I8x16Shl
| Operator::I8x16ShrS
| Operator::I8x16ShrU
| Operator::I8x16SubSaturateS
| Operator::I8x16SubSaturateU
| Operator::I8x16Mul
| Operator::I16x8AnyTrue
| Operator::I16x8AllTrue
| Operator::I16x8Shl
| Operator::I16x8ShrS
| Operator::I16x8ShrU
| Operator::I16x8SubSaturateS
| Operator::I16x8SubSaturateU
| Operator::I32x4AnyTrue
| Operator::I32x4AllTrue
| Operator::I32x4Shl