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cranelift: remove unreachable scalar lowerings of saturating arithmetic

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Since `uadd_sat`, `sadd_sat`, `usub_sat`, and `ssub_sat` are now only
available to vector types, this removes the lowering code for the
scalar versions of these instructions in the arm32 and aarch64 backends.
This commit is contained in:
Andrew Brown
2021-05-13 15:58:27 -07:00
parent 1fe7676831
commit 84b6f05971
2 changed files with 18 additions and 63 deletions
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4
cranelift/codegen/src/isa/arm32/lower_inst.rs
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@@ -85,14 +85,12 @@ pub(crate) fn lower_insn_to_regs<C: LowerCtx<I = Inst>>(
shift: None,
});
}
Opcode::SaddSat | Opcode::SsubSat | Opcode::Imul | Opcode::Udiv | Opcode::Sdiv => {
Opcode::Imul | Opcode::Udiv | Opcode::Sdiv => {
let rd = output_to_reg(ctx, outputs[0]);
let rn = input_to_reg(ctx, inputs[0], NarrowValueMode::None);
let rm = input_to_reg(ctx, inputs[1], NarrowValueMode::None);
let alu_op = match op {
Opcode::SaddSat => ALUOp::Qadd,
Opcode::SsubSat => ALUOp::Qsub,
Opcode::Imul => ALUOp::Mul,
Opcode::Udiv => ALUOp::Udiv,
Opcode::Sdiv => ALUOp::Sdiv,