xenia/fox32asm
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

fox32+fox32asm: Add proper support for greater than and less than

Browse Source 
This adds IFGT, IFGTEQ, IFLT, and IFLTEQ, which makes it easier to
check for these conditions.
This commit is contained in:
Ry 2022-03-12 12:15:27 -08:00
parent 492e8d51a1
commit 9fb445f688
2 changed files with 22 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/fox32.pest
View File

@ -55,10 +55,14 @@ size = @{
}
condition = @{
"ifz" |
"ifnz" |
"ifc" |
"ifnc"
"ifz" |
"ifnz" |
"ifc" |
"ifnc" |
"ifgteq" |
"ifgt" |
"iflteq" |
"iflt"
}
instruction = {

14
src/main.rs
View File

@ -205,6 +205,10 @@ enum Condition {
NotZero,
Carry,
NotCarry,
GreaterThan,
// GreaterThanEqualTo is equivalent to NotCarry
// LessThan is equivalent to Carry
LessThanEqualTo,
}
#[derive(PartialEq, Debug, Clone)]
@ -561,6 +565,10 @@ fn parse_condition(pair: &pest::iterators::Pair<Rule>) -> Condition {
"ifnz" => Condition::NotZero,
"ifc" => Condition::Carry,
"ifnc" => Condition::NotCarry,
"ifgt" => Condition::GreaterThan,
"ifgteq" => Condition::NotCarry,
"iflt" => Condition::Carry,
"iflteq" => Condition::LessThanEqualTo,
_ => panic!("Unsupported condition: {}", pair.as_str()),
}
}
@ -976,6 +984,8 @@ fn condition_source_destination_to_byte(node: &AstNode) -> u8 {
Condition::NotZero => 0x20,
Condition::Carry => 0x30,
Condition::NotCarry => 0x40,
Condition::GreaterThan => 0x50,
Condition::LessThanEqualTo => 0x60,
}
}
AstNode::OperationOne {condition, ..} => {
@ -985,6 +995,8 @@ fn condition_source_destination_to_byte(node: &AstNode) -> u8 {
Condition::NotZero => 0x20,
Condition::Carry => 0x30,
Condition::NotCarry => 0x40,
Condition::GreaterThan => 0x50,
Condition::LessThanEqualTo => 0x60,
}
}
AstNode::OperationTwo {condition, ..} => {
@ -994,6 +1006,8 @@ fn condition_source_destination_to_byte(node: &AstNode) -> u8 {
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),