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fixed a bug setting the carry flag in ASL

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This commit is contained in:
jborza 2019-05-07 14:09:38 +02:00
parent 4186df1468
commit dc88cf14e6
2 changed files with 35 additions and 1 deletions
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3
cpu.c
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@ -208,9 +208,10 @@ void CPY(State6502 * state, byte operand) {
cmp_internal(state, state->y, operand);
}
//Aritmetic Shift Left
byte asl(State6502 * state, byte operand) {
byte result = operand << 1;
state->flags.c = operand > 0x80;
state->flags.c = (operand & 0x80) == 0x80;
set_NZ_flags(state, result);
return result;
}

33
test6502.c
View File

@ -2391,6 +2391,37 @@ void test_RTI() {
test_cleanup(&state);
}
// ASL
void test_ASL_ACC(byte a, byte expected_a, byte expected_c) {
State6502 state = create_blank_state();
state.a = a;
//arrange
char program[] = { ASL_ACC };
memcpy(state.memory, program, sizeof(program));
//act
test_step(&state);
//assert
assertA(&state, expected_a);
assert_flag_c(&state, expected_c);
//cleanup
test_cleanup(&state);
}
void test_asl_multiple() {
test_ASL_ACC(/* A */ 0x0, /* Result*/ 0x0, /* C */ 0);
test_ASL_ACC(/* A */ 0x1, /* Result*/ 0x2, /* C */ 0);
test_ASL_ACC(/* A */ 0x1F, /* Result*/ 0x3E, /* C */ 0);
test_ASL_ACC(/* A */ 0x7F, /* Result*/ 0xFE, /* C */ 0);
test_ASL_ACC(/* A */ 0x80, /* Result*/ 0x0, /* C */ 1);
test_ASL_ACC(/* A */ 0x81, /* Result*/ 0x2, /* C */ 1);
test_ASL_ACC(/* A */ 0xFF, /* Result*/ 0xFE, /* C */ 1);
}
/////////////////////
typedef void fp();
@ -2419,6 +2450,7 @@ fp* tests_jsr_rts[] = { test_JSR, test_JSR_RTS, test_RTS };
fp* tests_brk[] = { test_BRK };
fp* tests_branch[] = { test_branching_multiple };
fp* tests_rti[] = { test_RTI };
fp* tests_asl[] = { test_asl_multiple };
#define RUN(suite) run_suite(suite, sizeof(suite)/sizeof(fp*))
@ -2431,6 +2463,7 @@ void run_suite(fp * *suite, int size) {
}
void run_tests() {
RUN(tests_asl);
RUN(tests_rti);
RUN(tests_branch);
RUN(tests_sbc);