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Document using inline asm with SoA, structs with array members

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Lauri Kasanen 2019-05-14 18:15:27 +03:00 committed by Oliver Schmidt
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doc/cc65.sgml
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@ -1448,10 +1448,16 @@ Or, to access a struct member of a static variable:
unsigned char x; unsigned char x;
unsigned char y; unsigned char y;
unsigned char color; unsigned char color;
unsigned char aux[32];
} pixel_t; } pixel_t;
static pixel_t pixel; static pixel_t pixel;
__asm__ ("ldy #%b", offsetof(pixel_t, color)); __asm__ ("ldy #%b", offsetof(pixel_t, color));
__asm__ ("lda %v,y", pixel); __asm__ ("lda %v,y", pixel);
/* or to access an array member */
static unsigned char i;
__asm__ ("ldy %v", i);
__asm__ ("lda %v+%b,y", pixel, offsetof(pixel_t, aux));
</verb></tscreen> </verb></tscreen>
<p> <p>
The next example shows how to use global variables to exchange data between C The next example shows how to use global variables to exchange data between C