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[Core/MD] optimized SRAM word accesses on big-endian platform

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This commit is contained in:
ekeeke 2019-11-28 00:22:13 +01:00
parent 0628db556f
commit e329aa1cc7
2 changed files with 4 additions and 7 deletions
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9
core/cart_hw/sram.c
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@ -2,7 +2,7 @@
* Genesis Plus * Genesis Plus
* Backup RAM support * Backup RAM support
* *
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX) * Copyright (C) 2007-2019 Eke-Eke (Genesis Plus GX)
* *
* Redistribution and use of this code or any derivative works are permitted * Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: * provided that the following conditions are met:
@ -214,8 +214,7 @@ unsigned int sram_read_byte(unsigned int address)
unsigned int sram_read_word(unsigned int address) unsigned int sram_read_word(unsigned int address)
{ {
address &= 0xfffe; return READ_WORD(sram.sram, address & 0xfffe);
return (sram.sram[address + 1] | (sram.sram[address] << 8));
} }
void sram_write_byte(unsigned int address, unsigned int data) void sram_write_byte(unsigned int address, unsigned int data)
@ -225,7 +224,5 @@ void sram_write_byte(unsigned int address, unsigned int data)
void sram_write_word(unsigned int address, unsigned int data) void sram_write_word(unsigned int address, unsigned int data)
{ {
address &= 0xfffe; WRITE_WORD(sram.sram, address & 0xfffe, data);
sram.sram[address] = data >> 8;
sram.sram[address + 1] = data & 0xff;
} }

2
core/cart_hw/sram.h
View File

@ -2,7 +2,7 @@
* Genesis Plus * Genesis Plus
* Backup RAM support * Backup RAM support
* *
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX) * Copyright (C) 2007-2019 Eke-Eke (Genesis Plus GX)
* *
* Redistribution and use of this code or any derivative works are permitted * Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: * provided that the following conditions are met: