gbadev : Message: accessing memory

gbadev

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Message #13598 of 15019 |

i've been looking at various gba.h files and have a question about setting up
memory locations. I've notived 3 main ways people are doing this....

#define OBJPaletteMem 0x5000200
#define OBJPaletteMem (u16*)0x5000200
u16* OBJPaletteMem = (u16*)0x5000200;

Can someone please explain which method is best? Am i right in assuming one
method is faster?

thanks

Wed Jan 1, 2003 9:52 pm

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Message #13598 of 15019 |

Expand Messages	Author	Sort by Date
i've been looking at various gba.h files and have a question about setting up memory locations. I've notived 3 main ways people are doing this.... #define...	PurpleDecay@...	Jan 1, 2003 10:15 pm
... up ... Using this method you have an integer which still needs to be casted to a pointer, so if you want to change color entry 0 to white, you'd do: ...	Jan-Lieuwe Koopmans jan-lieuwe@...	Jan 1, 2003 10:36 pm
#define OBJPaletteMem ((volatile u16 *)0x5000200) Is fastest and proper. If you don't declare it volatile, the compiler may optimize out references to the...	Mike Schwartz mykes@...	Jan 1, 2003 10:49 pm
... while that statement is true for some cisc-cpus, it doesnt apply to most (if not all) risc cpus.... ie, risc-cpus always do memory access indirect anyway ...	Groepaz groepaz2000	Jan 2, 2003 8:57 pm

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