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🐛 bug: fix loader bug

main
_ 2023-09-26 23:19:12 -05:00
parent 2f676adc19
commit 062c6e6a2d
1 changed files with 6 additions and 2 deletions
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8
src/loader.rs
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@ -43,13 +43,17 @@ pub (crate) fn compile_bytecode (source: Vec <u8>) -> Vec <u8> {
output.stdout.as_slice ().to_vec ()
}
fn i_sb (buf: [u8; 4]) -> Option <i8> {
let b = buf [2];
i8::try_from (i32::try_from (b).ok ()? - 127).ok ()
}
pub fn parse_inst (buf: [u8; 4]) -> Option <Inst>
{
let opcode = buf [0] & 0x7f;
let a = (buf [0] >> 7) | ((buf [1] & 0x7f) << 1);
let b = buf [2];
let sb = i8::try_from (b).ok ()? - 127;
let ax = a as u32 + ((b as u32) << 8);
let c = buf [3];
let bx =
@ -84,7 +88,7 @@ pub fn parse_inst (buf: [u8; 4]) -> Option <Inst>
0x30 => Inst::MmBinK (a, b, c, k),
0x33 => Inst::Not (a, b),
0x3c => Inst::EqK (a, b, k),
0x3d => Inst::EqI (a, sb, k),
0x3d => Inst::EqI (a, i_sb (buf)?, k),
0x38 => Inst::Jmp (s_j),
0x42 => Inst::Test (a, k),
0x44 => Inst::Call (a, b, c),