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Add saturating addition with a SIMD encoding

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This includes the new instructions `sadd_sat` and `uadd_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-addition).
This commit is contained in:
Andrew Brown
2019-09-18 15:56:15 -07:00
parent 630cb3ee62
commit 21144068d4
5 changed files with 98 additions and 4 deletions
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12
cranelift/wasm/src/code_translator.rs
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@@ -1000,6 +1000,14 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
let (a, b) = state.pop2();
state.push1(builder.ins().iadd(a, b))
}
Operator::I8x16AddSaturateS | Operator::I16x8AddSaturateS => {
let (a, b) = state.pop2();
state.push1(builder.ins().sadd_sat(a, b))
}
Operator::I8x16AddSaturateU | Operator::I16x8AddSaturateU => {
let (a, b) = state.pop2();
state.push1(builder.ins().uadd_sat(a, b))
}
Operator::I8x16Sub | Operator::I16x8Sub | Operator::I32x4Sub | Operator::I64x2Sub => {
let (a, b) = state.pop2();
state.push1(builder.ins().isub(a, b))
@@ -1064,8 +1072,6 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
| Operator::I8x16Shl
| Operator::I8x16ShrS
| Operator::I8x16ShrU
| Operator::I8x16AddSaturateS
| Operator::I8x16AddSaturateU
| Operator::I8x16SubSaturateS
| Operator::I8x16SubSaturateU
| Operator::I8x16Mul
@@ -1074,8 +1080,6 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
| Operator::I16x8Shl
| Operator::I16x8ShrS
| Operator::I16x8ShrU
| Operator::I16x8AddSaturateS
| Operator::I16x8AddSaturateU
| Operator::I16x8SubSaturateS
| Operator::I16x8SubSaturateU
| Operator::I32x4AnyTrue