Hello
I`m implementing the function Mixcolunms. I`m on the step of instructing the double word, they do it with shift bits.
I wonder if there is a better way. I cant not use pshufb. I can show what i have done.
Thanks an sorry for my expression.
Hi cpu2,
please show us your code and we'll see what can be done.
Gunther
this isn't exactly what you are looking for
but, it is pretty cool and might give you ideas to work with
Drizz "Stir Fry" bitswap
http://www.masmforum.com/board/index.php?topic=12722.msg98224#msg98224 (http://www.masmforum.com/board/index.php?topic=12722.msg98224#msg98224)
Okay, i will read the link.
This is the implementation.
bts0_: .quad 0x8080808080808080,0x8080808080808080 ; 0x600218
dlb0_: .quad 0x7f7f7f7f7f7f7f7f,0x7f7f7f7f7f7f7f7f ; 0x600228
xrb0_: .quad 0x1b1b1b1b1b1b1b1b,0x1b1b1b1b1b1b1b1b ; 0x600238
.section .text
.globl _start
_start:
//// intel_syntax
//// xmm0 = 2 x ; xmm1 = 1 x ; xmm2 = 3 x
movdqa xmm1, xmm0
movdqa xmm2, xmm1
pand xmm0, 0x600218
pcmpeqb xmm0, 0x600218
movdqa xmm3, xmm0
pand xmm1, xmm0
pandn xmm0, xmm2
pand xmm1, 0x600228
pslld xmm0, 1
pslld xmm1, 1
pxor xmm1, 0x600238
pand xmm1, xmm3
pxor xmm0, xmm1
pxor xmm2, xmm0
Only is the ordination an XOR. As seen?
Thanks.
Already solved the problem. I use the pslld/psrld and movdqa instructions, for the ordination.
If i want the result, say.
Regards.