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Eliminate 16-bit arithmetic from SBX.

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Thomas Harte
2025-10-23 19:32:50 -04:00
parent cf93c39881
commit cfef2b4e19
1 changed files with 2 additions and 3 deletions
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Processors/6502Mk2/Perform.hpp
+2 -3
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@@ -152,10 +152,9 @@ void arr(RegistersT &registers, const uint8_t operand) {
template <typename RegistersT>
void sbx(RegistersT &registers, const uint8_t operand) {
registers.x &= registers.a;
const uint16_t difference = registers.x - operand;
registers.x = uint8_t(difference);
registers.flags.carry = operand <= registers.x;
registers.x -= operand;
registers.flags.set_nz(registers.x);
registers.flags.carry = ((difference >> 8)&1)^1;
}
template <typename RegistersT>