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Add more detail in INC/X/Y testing

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This commit is contained in:
Peter Evans 2018-04-30 22:15:38 -05:00
parent 1ac19aaaae
commit de34d7d0f9
1 changed files with 76 additions and 16 deletions
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92
tests/mos6502/arith.c
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@ -227,35 +227,95 @@ Test(mos6502_arith, dey)
cr_assert_eq(cpu->P & MOS_ZERO, MOS_ZERO); cr_assert_eq(cpu->P & MOS_ZERO, MOS_ZERO);
} }
/*
* The INC instruction works similarly to DEC; the same status flags are
* updated. But, of course, we increment rather than decrement.
*/
Test(mos6502_arith, inc) Test(mos6502_arith, inc)
{ {
cpu->eff_addr = 123; vm_8bit main = 123,
mos6502_handle_inc(cpu, 55); ntest = 0x7F,
cr_assert_eq(mos6502_get(cpu, 123), 56); ztest = 0xFF;
cpu->A = 8; vm_16bit addr = 0x123;
cpu->eff_addr = 0;
cpu->A = main;
cpu->addr_mode = ACC; cpu->addr_mode = ACC;
mos6502_handle_inc(cpu, 0); mos6502_handle_inc(cpu, main);
cr_assert_eq(cpu->A, 9); cr_assert_eq(cpu->A, main + 1);
cpu->A = 0xff; cpu->eff_addr = addr;
mos6502_handle_inc(cpu, 0); cpu->addr_mode = ABS;
cr_assert_eq(cpu->A, 0); mos6502_handle_inc(cpu, main);
cr_assert_eq(mos6502_get(cpu, addr), main + 1);
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
mos6502_handle_inc(cpu, ntest);
// Cast ntest - 1 so that the result we compare is 8-bit negative
// and not 32-bit negative
cr_assert_eq(mos6502_get(cpu, addr), (vm_8bit)(ntest + 1));
cr_assert_eq(cpu->P & MOS_NEGATIVE, MOS_NEGATIVE);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
mos6502_handle_inc(cpu, ztest);
cr_assert_eq(mos6502_get(cpu, addr), (vm_8bit)(ztest + 1));
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
cr_assert_eq(cpu->P & MOS_ZERO, MOS_ZERO);
} }
Test(mos6502_arith, inx) Test(mos6502_arith, inx)
{ {
cpu->X = 5; vm_8bit main = 123,
mos6502_handle_inx(cpu, 0); ntest = 0x7F,
cr_assert_eq(cpu->X, 6); ztest = 0xFF;
vm_16bit addr = 0x123;
cpu->addr_mode = ACC;
mos6502_handle_inx(cpu, main);
cr_assert_eq(cpu->X, main + 1);
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
mos6502_handle_inx(cpu, ntest);
// Cast ntest - 1 so that the result we compare is 8-bit negative
// and not 32-bit negative
cr_assert_eq(cpu->X, (vm_8bit)(ntest + 1));
cr_assert_eq(cpu->P & MOS_NEGATIVE, MOS_NEGATIVE);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
mos6502_handle_inx(cpu, ztest);
cr_assert_eq(cpu->X, (vm_8bit)(ztest + 1));
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
cr_assert_eq(cpu->P & MOS_ZERO, MOS_ZERO);
} }
Test(mos6502_arith, iny) Test(mos6502_arith, iny)
{ {
cpu->Y = 5; vm_8bit main = 123,
mos6502_handle_iny(cpu, 0); ntest = 0x7F,
cr_assert_eq(cpu->Y, 6); ztest = 0xFF;
vm_16bit addr = 0x123;
cpu->addr_mode = ACC;
mos6502_handle_iny(cpu, main);
cr_assert_eq(cpu->Y, main + 1);
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
mos6502_handle_iny(cpu, ntest);
// Cast ntest - 1 so that the result we compare is 8-bit negative
// and not 32-bit negative
cr_assert_eq(cpu->Y, (vm_8bit)(ntest + 1));
cr_assert_eq(cpu->P & MOS_NEGATIVE, MOS_NEGATIVE);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
mos6502_handle_iny(cpu, ztest);
cr_assert_eq(cpu->Y, (vm_8bit)(ztest + 1));
cr_assert_eq(cpu->P & MOS_NEGATIVE, 0);
cr_assert_eq(cpu->P & MOS_ZERO, MOS_ZERO);
} }
Test(mos6502_arith, sbc) Test(mos6502_arith, sbc)