diff options
Diffstat (limited to 'newlib/libc/machine/rx/strncmp.S')
| -rw-r--r-- | newlib/libc/machine/rx/strncmp.S | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/newlib/libc/machine/rx/strncmp.S b/newlib/libc/machine/rx/strncmp.S index 929e9cb0a..4be8076db 100644 --- a/newlib/libc/machine/rx/strncmp.S +++ b/newlib/libc/machine/rx/strncmp.S @@ -4,6 +4,32 @@ .global _strncmp .type _strncmp,@function _strncmp: + ;; R1: string1 + ;; R2: string2 + ;; R3: max number of bytes to compare +#ifdef __RX_DISALLOW_STRING_INSNS__ + cmp #0, r3 ; For a length of zero, return zero + beq 4f + +2: mov.b [r1+], r4 + mov.b [r2+], r5 + cmp #0, r4 + beq 3f + cmp #0, r5 + beq 3f + sub #1, r3 + 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 + +4: mov #0, r1 + rts +#else scmpu ; Perform the string comparison bnc 1f ; If Carry is not set skip over scne.L r1 ; Set result based on Z flag @@ -11,3 +37,5 @@ _strncmp: 1: ; mov #-1,r1 ; Carry not set, result should be negative rts ; +#endif + .size _strncmp, . - _strncmp |