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Merge pull request #2569 from sidneycadot/fix-cpu-register-types

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sim65: tighten 6502 register types
This commit is contained in:
Sidney Cadot
2024-12-22 18:00:16 +01:00
committed by GitHub
parent 3c5d5aac63 8cb941985d
commit 075514c60c
2 changed files with 10 additions and 14 deletions
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10
src/sim65/6502.c
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@@ -664,15 +664,12 @@ static unsigned HaveIRQRequest;
/* ADC, binary mode (6502 and 65C02) */
/* TODO: once the Regs fields are properly sized, get rid of the
* "& 0xff" in the Regs.AC asignment.
*/
#define ADC_BINARY_MODE(v) \
do { \
const uint8_t op = v; \
const uint8_t OldAC = Regs.AC; \
bool carry = GET_CF(); \
Regs.AC = (OldAC + op + carry) & 0xff; \
Regs.AC = (OldAC + op + carry); \
const bool NV = Regs.AC >= 0x80; \
carry = OldAC + op + carry >= 0x100; \
SET_SF(NV); \
@@ -1033,15 +1030,12 @@ static unsigned HaveIRQRequest;
TEST_ZF (Val)
/* SBC, binary mode (6502 and 65C02) */
/* TODO: once the Regs fields are properly sized, get rid of the
* "& 0xff" in the Regs.AC asignment.
*/
#define SBC_BINARY_MODE(v) \
do { \
const uint8_t op = v; \
const uint8_t OldAC = Regs.AC; \
const bool borrow = !GET_CF(); \
Regs.AC = (OldAC - op - borrow) & 0xff; \
Regs.AC = (OldAC - op - borrow); \
const bool NV = Regs.AC >= 0x80; \
SET_SF(NV); \
SET_OF(((OldAC >= 0x80) ^ NV) & ((op < 0x80) ^ NV)); \