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Update tests for CMP/CPX/CPY.

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This commit is contained in:
Peter Evans 2018-04-30 21:23:34 -05:00
parent 8ff2323c40
commit ad4014ced4
1 changed files with 58 additions and 22 deletions
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80
tests/mos6502/arith.c
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@ -46,47 +46,83 @@ Test(mos6502_arith, adc_dec)
cr_assert_eq(cpu->A, 0x29);
}
/*
* In CMP, the following occurs:
*
* Z = 1 if A = DATA (which is to say: Z = 1 if A - DATA = 0)
* N = 1 if DATA BIT 7 is high
* C = 1 if A >= DATA
*
* Only status flags are changed by the operation of CMP.
*
* We need to test four permutations:
* - A > DATA
* - A = DATA
* - A < DATA
*/
Test(mos6502_arith, cmp)
{
cpu->A = 5;
mos6502_handle_cmp(cpu, 3);
cpu->A = 123;
mos6502_handle_cmp(cpu, cpu->A - 1);
cr_assert_eq(cpu->P & MOS_CARRY, MOS_CARRY);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
cpu->A = 3;
mos6502_handle_cmp(cpu, 4);
cr_assert_eq(cpu->P & MOS_CARRY, 0);
cr_assert_eq(cpu->P & MOS_NEGATIVE, MOS_NEGATIVE);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
cpu->A = 192;
mos6502_handle_cmp(cpu, 3);
mos6502_handle_cmp(cpu, cpu->A);
cr_assert_eq(cpu->P & MOS_CARRY, MOS_CARRY);
cr_assert_eq(cpu->P & MOS_NEGATIVE, MOS_NEGATIVE);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
cpu->A = 111;
mos6502_handle_cmp(cpu, 111);
cr_assert_eq(cpu->P & MOS_ZERO, MOS_ZERO);
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
mos6502_handle_cmp(cpu, cpu->A + 1);
cr_assert_eq(cpu->P & MOS_CARRY, 0);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
cr_assert_eq(cpu->P & MOS_NEGATIVE, MOS_NEGATIVE);
}
/*
* As in the CMP test, we check the same qualities: X > DATA, X = DATA,
* X < DATA.
*/
Test(mos6502_arith, cpx)
{
cpu->X = 5;
mos6502_handle_cpx(cpu, 3);
cpu->X = 123;
mos6502_handle_cpx(cpu, cpu->X - 1);
cr_assert_eq(cpu->P & MOS_CARRY, MOS_CARRY);
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
mos6502_handle_cpx(cpu, cpu->X);
cr_assert_eq(cpu->P & MOS_CARRY, MOS_CARRY);
cr_assert_eq(cpu->P & MOS_ZERO, MOS_ZERO);
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
mos6502_handle_cpx(cpu, cpu->X + 1);
cr_assert_eq(cpu->P & MOS_CARRY, 0);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
cr_assert_eq(cpu->P & MOS_NEGATIVE, MOS_NEGATIVE);
}
/*
* And, finally, we check similarly as to the CPX test, except with Y
* instead of X.
*/
Test(mos6502_arith, cpy)
{
cpu->Y = 5;
mos6502_handle_cpy(cpu, 3);
cpu->Y = 123;
mos6502_handle_cpy(cpu, cpu->Y - 1);
cr_assert_eq(cpu->P & MOS_CARRY, MOS_CARRY);
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
mos6502_handle_cpy(cpu, cpu->Y);
cr_assert_eq(cpu->P & MOS_CARRY, MOS_CARRY);
cr_assert_eq(cpu->P & MOS_ZERO, MOS_ZERO);
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
mos6502_handle_cpy(cpu, cpu->Y + 1);
cr_assert_eq(cpu->P & MOS_CARRY, 0);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
cr_assert_eq(cpu->P & MOS_NEGATIVE, MOS_NEGATIVE);
}
Test(mos6502_arith, dec)