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machinst x64: implement float min/max with the right semantics;

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This commit is contained in:
Benjamin Bouvier
2020-07-21 14:27:44 +02:00
parent e43310a088
commit 03b9e1e86a
4 changed files with 168 additions and 0 deletions
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15
cranelift/codegen/src/isa/x64/lower.rs
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@@ -924,6 +924,21 @@ fn lower_insn_to_regs<C: LowerCtx<I = Inst>>(
ctx.emit(Inst::xmm_rm_r(sse_op, RegMem::reg(rhs), dst));
}
Opcode::Fmin | Opcode::Fmax => {
let lhs = input_to_reg(ctx, inputs[0]);
let rhs = input_to_reg(ctx, inputs[1]);
let dst = output_to_reg(ctx, outputs[0]);
let is_min = op == Opcode::Fmin;
let output_ty = ty.unwrap();
ctx.emit(Inst::gen_move(dst, rhs, output_ty));
let op_size = match output_ty {
F32 => OperandSize::Size32,
F64 => OperandSize::Size64,
_ => panic!("unexpected type {:?} for fmin/fmax", output_ty),
};
ctx.emit(Inst::xmm_min_max_seq(op_size, is_min, lhs, dst));
}
Opcode::Sqrt => {
let src = input_to_reg_mem(ctx, inputs[0]);
let dst = output_to_reg(ctx, outputs[0]);