From 9f8fbc4e8770f081c4c45a84d8d7a93dcafba117 Mon Sep 17 00:00:00 2001 From: Ricardo Maurizio Paul Date: Sat, 21 May 2022 23:12:33 +0200 Subject: [PATCH] fix inc_lr and dec_lr overflow --- Core/sm83_cpu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Core/sm83_cpu.c b/Core/sm83_cpu.c index c35e539c5..013d24e51 100644 --- a/Core/sm83_cpu.c +++ b/Core/sm83_cpu.c @@ -595,7 +595,7 @@ static void inc_lr(GB_gameboy_t *gb, uint8_t opcode) uint8_t value; register_id = (opcode >> 4) + 1; - value = (gb->registers[register_id] & 0xFF) + 1; + value = (gb->registers[register_id] + 1) & 0xFF; gb->registers[register_id] = (gb->registers[register_id] & 0xFF00) | value; gb->af &= ~(GB_SUBTRACT_FLAG | GB_ZERO_FLAG | GB_HALF_CARRY_FLAG); @@ -614,7 +614,7 @@ static void dec_lr(GB_gameboy_t *gb, uint8_t opcode) uint8_t value; register_id = (opcode >> 4) + 1; - value = (gb->registers[register_id] & 0xFF) - 1; + value = (gb->registers[register_id] - 1) & 0xFF; gb->registers[register_id] = (gb->registers[register_id] & 0xFF00) | value; gb->af &= ~(GB_ZERO_FLAG | GB_HALF_CARRY_FLAG);