dnutiu/chip8-rust
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fix shift

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This commit is contained in:
Denis-Cosmin NUTIU 2024-12-07 22:13:58 +02:00
parent e948d3b5fb
commit 9dd876b622
1 changed files with 2 additions and 4 deletions
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6
src/emulator.rs
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@ -286,14 +286,12 @@ where
} }
ProcessorInstruction::ShiftLeft(vx, vy) => { ProcessorInstruction::ShiftLeft(vx, vy) => {
trace!("ShiftLeft VX={vx:04x} VY={vy:04x}"); trace!("ShiftLeft VX={vx:04x} VY={vy:04x}");
// Original chip8 behavior self.registers[0xF] = (self.registers[vx as usize] >> 7) & 1;
self.registers[0xF] = (self.registers[vx as usize] & 0x10) >> 4;
self.registers[vx as usize] <<= 1; self.registers[vx as usize] <<= 1;
} }
ProcessorInstruction::ShiftRight(vx, vy) => { ProcessorInstruction::ShiftRight(vx, vy) => {
trace!("ShiftRight VX={vx:04x} VY={vy:04x}"); trace!("ShiftRight VX={vx:04x} VY={vy:04x}");
// Original chip8 behavior self.registers[0xF] = self.registers[vx as usize] & 0x1;
self.registers[0xF] = self.registers[vx as usize] & 0x01;
self.registers[vx as usize] >>= 1; self.registers[vx as usize] >>= 1;
} }
ProcessorInstruction::JumpWithOffset(address) => { ProcessorInstruction::JumpWithOffset(address) => {