Renamed COND to PSR

1 files changed, 6 insertions, 5 deletions

diff --git a/lc3.c b/lc3.c
index 759361a..49cbd5d 100644
--- a/lc3.c
+++ b/lc3.c
@@ -24,7 +24,7 @@ enum Register
 	REGISTER_R6,
 	REGISTER_R7,
 	REGISTER_PC,
-	REGISTER_COND,
+	REGISTER_PSR,
 	REGISTER_COUNT,
 };
 
@@ -167,17 +167,18 @@ void write_memory(const uint16_t address, const uint16_t value)
 
 void update_cond(const uint16_t reg)
 {
+	registers[REGISTER_PSR] &= 0xfff8;
 	if (registers[reg] == 0)
 	{
-		registers[REGISTER_COND] = FLAG_ZRO;
+		registers[REGISTER_PSR] |= FLAG_ZRO;
 	}
 	else if (registers[reg] >> 15)
 	{
-		registers[REGISTER_COND] = FLAG_NEG;
+		registers[REGISTER_PSR] |= FLAG_NEG;
 	}
 	else
 	{
-		registers[REGISTER_COND] = FLAG_POS;
+		registers[REGISTER_PSR] |= FLAG_POS;
 	}
 }
 
@@ -241,7 +242,7 @@ void step(const uint16_t instruction)
 		{
 			const uint16_t offset = sign_extend(instruction & 0x1ff, 9);
 			const uint16_t flag = (instruction >> 9) & 0x07;
-			if (flag & registers[REGISTER_COND])
+			if (flag & registers[REGISTER_PSR])
 			{
 				registers[REGISTER_PC] += offset;
 			}