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#include "PR/asm.h"
#include "PR/regdef.h"
.text
LEAF(bcmp)
xor v0, a0, a1
blt a2, 0x10, bytecmp
and v0, v0, 3
negu t8, a0
bnez v0, unaligncmp
and t8, t8, 3
subu a2, a2, t8
beqz t8, wordcmp
move v0, v1
lwl v0, (a0)
lwl v1, (a1)
addu a0, a0, t8
addu a1, a1, t8
bne v0, v1, cmpne
wordcmp:
and a3, a2, ~3
subu a2, a2, a3
beqz a3, bytecmp
addu a3, a3, a0
1:
lw v0, (a0)
lw v1, (a1)
addu a0, a0, 4
addu a1, a1, 4
bne v0, v1, cmpne
bne a0, a3, 1b
b bytecmp
unaligncmp:
negu a3, a1
and a3, a3, 3
subu a2, a2, a3
beqz a3, partaligncmp
addu a3, a3, a0
1:
lbu v0, (a0)
lbu v1, (a1)
addu a0, a0, 1
addu a1, a1, 1
bne v0, v1, cmpne
bne a0, a3, 1b
partaligncmp:
and a3, a2, ~3
subu a2, a2, a3
beqz a3, bytecmp
addu a3, a3, a0
1:
lwl v0, (a0)
lwr v0, 3(a0)
lw v1, (a1)
addu a0, a0, 4
addu a1, a1, 4
bne v0, v1, cmpne
bne a0, a3, 1b
bytecmp:
addu a3, a2, a0
blez a2, cmpdone
1:
lbu v0, (a0)
lbu v1, (a1)
addu a0, a0, 1
addu a1, a1, 1
bne v0, v1, cmpne
bne a0, a3, 1b
cmpdone:
move v0, zero
jr ra
cmpne:
li v0, 1
jr ra
END(bcmp)
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