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z180: Fix cycle timings for branches not taken (one operand byte is always read)

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This commit is contained in:
AJR 2023-05-20 19:14:35 -04:00
parent b2acd13154
commit 2f11144d40
1 changed files with 7 additions and 4 deletions
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11
src/devices/cpu/z180/z180ops.h
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@ -184,7 +184,8 @@ uint32_t z180_device::ARG16()
} \ } \
else \ else \
{ \ { \
_PC += 2; \ (void)ARG(); \
_PC++; \
} }
/*************************************************************** /***************************************************************
@ -200,13 +201,14 @@ uint32_t z180_device::ARG16()
* JR_COND * JR_COND
***************************************************************/ ***************************************************************/
#define JR_COND(cond,opcode) \ #define JR_COND(cond,opcode) \
{ \
int8_t arg = (int8_t)ARG(); /* ARG() also increments _PC */ \
if( cond ) \ if( cond ) \
{ \ { \
int8_t arg = (int8_t)ARG(); /* ARG() also increments _PC */ \
_PC += arg; /* so don't do _PC += ARG() */ \ _PC += arg; /* so don't do _PC += ARG() */ \
CC(ex,opcode); \ CC(ex,opcode); \
} \ } \
else _PC++; }
/*************************************************************** /***************************************************************
* CALL * CALL
***************************************************************/ ***************************************************************/
@ -228,7 +230,8 @@ uint32_t z180_device::ARG16()
} \ } \
else \ else \
{ \ { \
_PC+=2; \ (void)ARG(); \
_PC++; \
} }
/*************************************************************** /***************************************************************