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Deduplicate condition to bits conversion

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This commit is contained in:
jn 2023-02-02 02:06:22 +01:00
parent fc1008cc10
commit b2212bfa24
1 changed files with 15 additions and 33 deletions
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48
src/main.rs
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@ -1118,6 +1118,18 @@ fn instruction_to_byte(node: &AstNode) -> u8 {
} }
} }
fn condition_to_bits(condition: &Condition) -> u8 {
match condition {
Condition::Always => 0x00,
Condition::Zero => 0x10,
Condition::NotZero => 0x20,
Condition::Carry => 0x30,
Condition::NotCarry => 0x40,
Condition::GreaterThan => 0x50,
Condition::LessThanEqualTo => 0x60,
}
}
fn condition_source_destination_to_byte(node: &AstNode) -> u8 { fn condition_source_destination_to_byte(node: &AstNode) -> u8 {
let source: u8 = match node { let source: u8 = match node {
AstNode::OperationZero {..} => 0x00, AstNode::OperationZero {..} => 0x00,
@ -1156,39 +1168,9 @@ fn condition_source_destination_to_byte(node: &AstNode) -> u8 {
_ => panic!("Attempting to parse a non-instruction AST node as an instruction: {:#?}", node), _ => panic!("Attempting to parse a non-instruction AST node as an instruction: {:#?}", node),
}; };
let condition: u8 = match node { let condition: u8 = match node {
AstNode::OperationZero {condition, ..} => { AstNode::OperationZero {condition, ..} => condition_to_bits(condition),
match condition { AstNode::OperationOne {condition, ..} => condition_to_bits(condition),
Condition::Always => 0x00, AstNode::OperationTwo {condition, ..} => condition_to_bits(condition),
Condition::Zero => 0x10,
Condition::NotZero => 0x20,
Condition::Carry => 0x30,
Condition::NotCarry => 0x40,
Condition::GreaterThan => 0x50,
Condition::LessThanEqualTo => 0x60,
}
}
AstNode::OperationOne {condition, ..} => {
match condition {
Condition::Always => 0x00,
Condition::Zero => 0x10,
Condition::NotZero => 0x20,
Condition::Carry => 0x30,
Condition::NotCarry => 0x40,
Condition::GreaterThan => 0x50,
Condition::LessThanEqualTo => 0x60,
}
}
AstNode::OperationTwo {condition, ..} => {
match condition {
Condition::Always => 0x00,
Condition::Zero => 0x10,
Condition::NotZero => 0x20,
Condition::Carry => 0x30,
Condition::NotCarry => 0x40,
Condition::GreaterThan => 0x50,
Condition::LessThanEqualTo => 0x60,
}
}
_ => panic!("Attempting to parse a non-instruction AST node as an instruction: {:#?}", node), _ => panic!("Attempting to parse a non-instruction AST node as an instruction: {:#?}", node),
}; };
condition | source | destination condition | source | destination