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/*
Copyright (c) 2009 Nick Clifton <nickc@redhat.com>
*/
.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
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