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Implement WideningPairwiseDotProductS for interpreter

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Implemented `WideningPairwiseDotProductS` to perform sign-extending
length-doubling multiplication on corresponding elements from two
`i16x8` SIMD vectors, performing a pairwise add on the results (thus
returning `i32x4`).

Copyright (c) 2021, Arm Limited
This commit is contained in:
dheaton-arm
2021-09-06 15:03:32 +01:00
parent 164835ecf5
commit 3b9bfc8187
2 changed files with 29 additions and 1 deletions
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16
cranelift/interpreter/src/step.rs
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@@ -845,7 +845,21 @@ where
Opcode::AtomicLoad => unimplemented!("AtomicLoad"),
Opcode::AtomicStore => unimplemented!("AtomicStore"),
Opcode::Fence => unimplemented!("Fence"),
Opcode::WideningPairwiseDotProductS => unimplemented!("WideningPairwiseDotProductS"),
Opcode::WideningPairwiseDotProductS => {
let ctrl_ty = types::I16X8;
let new_type = ctrl_ty.merge_lanes().unwrap();
let arg0 = extractlanes(&arg(0)?, ctrl_ty.lane_type())?;
let arg1 = extractlanes(&arg(1)?, ctrl_ty.lane_type())?;
let mut new_vec = SimdVec::new();
for (x, y) in arg0.chunks(2).into_iter().zip(arg1.chunks(2).into_iter()) {
let mut z = 0i128;
for (lhs, rhs) in x.into_iter().zip(y.into_iter()) {
z += lhs.clone().into_int()? * rhs.clone().into_int()?;
}
new_vec.push(Value::int(z, new_type.lane_type())?);
}
assign(vectorizelanes(&new_vec, new_type)?)
}
Opcode::SqmulRoundSat => unimplemented!("SqmulRoundSat"),
Opcode::IaddPairwise => assign(binary_pairwise(arg(0)?, arg(1)?, ctrl_ty, Value::add)?),