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Improves consistency.

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This commit is contained in:
Thomas Harte 2021-01-21 18:58:22 -05:00
parent e5076b295b
commit 3c887aff95
1 changed files with 2 additions and 2 deletions
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4
Processors/65816/Implementation/65816Implementation.hpp
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@ -885,7 +885,7 @@ template <typename BusHandler, bool uses_ready_line> void Processor<BusHandler,
const uint16_t a = registers_.a.full & registers_.m_masks[1]; const uint16_t a = registers_.a.full & registers_.m_masks[1];
unsigned int result = 0; unsigned int result = 0;
unsigned int borrow = registers_.flags.carry ^ 1; unsigned int borrow = registers_.flags.carry ^ 1;
const uint16_t decimal_result = uint16_t(registers_.a.full - data_buffer_.value - borrow); const uint16_t decimal_result = uint16_t(a - data_buffer_.value - borrow);
#define nibble(mask, adjustment, carry) \ #define nibble(mask, adjustment, carry) \
result += (a & mask) - (data_buffer_.value & mask) - borrow; \ result += (a & mask) - (data_buffer_.value & mask) - borrow; \
@ -900,7 +900,7 @@ template <typename BusHandler, bool uses_ready_line> void Processor<BusHandler,
#undef nibble #undef nibble
registers_.flags.overflow = (( (decimal_result ^ registers_.a.full) & (~decimal_result ^ data_buffer_.value) ) >> (1 + registers_.m_shift))&0x40; registers_.flags.overflow = (( (decimal_result ^ a) & (~decimal_result ^ data_buffer_.value) ) >> (1 + registers_.m_shift))&0x40;
registers_.flags.set_nz(uint16_t(result), registers_.m_shift); registers_.flags.set_nz(uint16_t(result), registers_.m_shift);
registers_.flags.carry = ((borrow >> 16)&1)^1; registers_.flags.carry = ((borrow >> 16)&1)^1;
LDA(result); LDA(result);