diff options
| -rw-r--r-- | source/cpuaddr.h | 10 | ||||
| -rw-r--r-- | source/port.h | 5 |
2 files changed, 15 insertions, 0 deletions
diff --git a/source/cpuaddr.h b/source/cpuaddr.h index 34fb41b..91a0347 100644 --- a/source/cpuaddr.h +++ b/source/cpuaddr.h @@ -256,6 +256,11 @@ static void AbsoluteLong (AccessMode a, InternalOp op) long Addr; #ifdef FAST_LSB_WORD_ACCESS Addr = (*(uint32 *) CPU.PC) & 0xffffff; +#elif defined FAST_ALIGNED_LSB_WORD_ACCESS + if (((int) CPU.PC & 1) == 0) + Addr = (*(uint16 *) CPU.PC) + (*(CPU.PC + 2) << 16); + else + Addr = *CPU.PC + ((*(uint16 *) (CPU.PC + 1)) << 8); #else Addr = *CPU.PC + (*(CPU.PC + 1) << 8) + (*(CPU.PC + 2) << 16); #endif @@ -434,6 +439,11 @@ static void AbsoluteLongIndexedX (AccessMode a, InternalOp op) long Addr; #ifdef FAST_LSB_WORD_ACCESS Addr = (*(uint32 *) CPU.PC + ICPU.Registers.X.W) & 0xffffff; +#elif defined FAST_ALIGNED_LSB_WORD_ACCESS + if (((int) CPU.PC & 1) == 0) + Addr = ((*(uint16 *) CPU.PC) + (*(CPU.PC + 2) << 16) + ICPU.Registers.X.W) & 0xFFFFFF; + else + Addr = (*CPU.PC + ((*(uint16 *) (CPU.PC + 1)) << 8) + ICPU.Registers.X.W) & 0xFFFFFF; #else Addr = (*CPU.PC + (*(CPU.PC + 1) << 8) + (*(CPU.PC + 2) << 16) + ICPU.Registers.X.W) & 0xffffff; #endif diff --git a/source/port.h b/source/port.h index 5b94d06..1e34410 100644 --- a/source/port.h +++ b/source/port.h @@ -274,6 +274,11 @@ EXTERN_C void MixSound(void); defined(__WIN32__) || defined(__alpha__) #define LSB_FIRST #define FAST_LSB_WORD_ACCESS +#elif defined(__MIPSEL__) +#define LSB_FIRST +// On little-endian MIPS, a 16-bit word can be read directly from an address +// only if it's aligned. +#define FAST_ALIGNED_LSB_WORD_ACCESS #else //#define MSB_FIRST #define LSB_FIRST |