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Add Select opcode.

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This commit is contained in:
losfair
2019-02-28 23:12:42 +08:00
parent ec9a8f0ebd
commit b7ca5e46ed
1 changed files with 50 additions and 0 deletions
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50
lib/dynasm-backend/src/codegen_x64.rs
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@ -1635,6 +1635,56 @@ impl FunctionCodeGenerator for X64FunctionCode {
was_unreachable,
)?;
}
Operator::Select => {
Self::emit_pop_into_ax(assembler, &mut self.value_stack)?;
let v_b = self.value_stack.pop()?;
let v_a = self.value_stack.pop()?;
if v_b.ty != v_a.ty {
return Err(CodegenError {
message: "select: type mismatch",
});
}
dynasm!(
assembler
; cmp eax, 0
);
match v_b.location {
ValueLocation::Stack => {
dynasm!(
assembler
; cmove rax, [rsp]
; add rsp, 8
);
}
ValueLocation::Register(x) => {
let reg = Register::from_scratch_reg(x);
dynasm!(
assembler
; cmove rax, Rq(reg as u8)
);
}
}
match v_a.location {
ValueLocation::Stack => {
dynasm!(
assembler
; cmovne rax, [rsp]
; add rsp, 8
);
}
ValueLocation::Register(x) => {
let reg = Register::from_scratch_reg(x);
dynasm!(
assembler
; cmovne rax, Rq(reg as u8)
);
}
}
Self::emit_push_from_ax(assembler, &mut self.value_stack, v_a.ty)?;
}
Operator::Br { relative_depth } => {
Self::emit_jmp(
assembler,