gistfile1.txt

assume DRAM is constant endian

u8[] DRAM = {1,2,3,4}
big endian
pix = *(int32_t *)(DRAM + addr);                      - pix = 1234
argb[1 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >> 24); - argb[1] = 1
argb[2 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >> 16); - argb[2] = 2
argb[3 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >>  8); - argb[3] = 3
argb[0 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >>  0); - argb[0] = 4, argb[]={4,1,2,3}
scanline[i] = *(int32_t *)(argb);                     - scanline = 4123

u8[] DRAM = {1,2,3,4}
little endian
pix = *(int32_t *)(DRAM + addr);                      - pix = 4321
argb[1 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >> 24); - argb[2] = 4
argb[2 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >> 16); - argb[1] = 3
argb[3 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >>  8); - argb[0] = 2
argb[0 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >>  0); - argb[3] = 1, argb[]={2,3,4,1}
scanline[i] = *(int32_t *)(argb);                     - scanline = 1432

not equal, assumption is false



assume DRAM is host endian

u8[] DRAM = {1,2,3,4}
big endian
pix = *(int32_t *)(DRAM + addr);                      - pix = 1234
argb[1 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >> 24); - argb[1] = 1
argb[2 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >> 16); - argb[2] = 2
argb[3 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >>  8); - argb[3] = 3
argb[0 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >>  0); - argb[0] = 4, argb[]={4,1,2,3}
scanline[i] = *(int32_t *)(argb);                     - scanline = 4123

u8[] DRAM = {4,3,2,1}
little endian
pix = *(int32_t *)(DRAM + addr);                      - pix = 1234
argb[1 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >> 24); - argb[2] = 1
argb[2 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >> 16); - argb[1] = 2
argb[3 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >>  8); - argb[0] = 3
argb[0 ^ BYTE_ADDR_XOR] = (unsigned char)(pix >>  0); - argb[3] = 4, argb[]={3,2,1,4}
scanline[i] = *(int32_t *)(argb);                     - scanline = 4123

equal, assumption is reasonable (and all other possible assumptions are false)



and scanline is a u32 array, so its endian isn't relevant