mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-11 19:49:32 +00:00
34 lines
673 B
ArmAsm
34 lines
673 B
ArmAsm
.file "strcmp.S"
|
|
|
|
.section .text
|
|
|
|
.global _strcmp
|
|
.type _strcmp,@function
|
|
_strcmp:
|
|
#ifdef __RX_DISALLOW_STRING_INSNS__
|
|
2: mov.b [r1+], r4
|
|
mov.b [r2+], r5
|
|
cmp #0, r4
|
|
beq 3f
|
|
cmp #0, r5
|
|
beq 3f
|
|
cmp r4, r5
|
|
beq 2b
|
|
|
|
3: and #0xff, r4 ; We need to perform an unsigned comparison of the bytes.
|
|
and #0xff, r5
|
|
sub r5, r4, r1
|
|
rts
|
|
#else
|
|
mov #-1, r3 ; Strictly speaking this is incorrect, but I doubt if anyone will ever know.
|
|
scmpu ; Perform the string comparison
|
|
bnc 1f ; If Carry is not set skip over
|
|
scne.L r1 ; Set result based on Z flag
|
|
rts ;
|
|
1: ;
|
|
mov #-1,r1 ; Carry not set, result should be negative
|
|
rts ;
|
|
#endif
|
|
.size _strcmp, . - _strcmp
|
|
|