30 lines
509 B
ArmAsm
30 lines
509 B
ArmAsm
#
|
|
.sect .text; .sect .rom; .sect .data; .sect .bss
|
|
|
|
/*
|
|
* Set xor..
|
|
* Stack: ( a b size -- a^b )
|
|
*/
|
|
|
|
.sect .text
|
|
.define .xor
|
|
.xor:
|
|
lw r4, 0(sp) ! r4 = size
|
|
addiu sp, sp, 4 ! sp points at b
|
|
addu r5, sp, r4 ! r5 points at a
|
|
srl r4, r4, 2 ! r4 = count of words
|
|
|
|
1:
|
|
lw at, 0(r5) ! load a
|
|
lw r6, 0(sp) ! load b
|
|
xor at, at, r6 ! combine
|
|
sw at, 0(r5) ! write back to a
|
|
addiu r5, r5, 4
|
|
addiu sp, sp, 4
|
|
addiu r4, r4, -1
|
|
bne r4, zero, 1b
|
|
nop
|
|
|
|
jr ra
|
|
nop
|
|
|