NetBSD/sys/lib/libkern/arch/sh5/strcasecmp.S

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/* $NetBSD: strcasecmp.S,v 1.1 2002/10/17 11:53:33 scw Exp $ */
/*
* Copyright 2002 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Steve C. Woodford for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/asm.h>
/*
* int strcasecmp(const char *s1, const char *s2)
*
* Note:
* We assume that this routine is mostly called for short strings, and that
* the overhead of aligning s1/s2 to permit long or quad comparisons is
* just Not Worth The Effort.
*/
ENTRY(strcasecmp)
#ifndef _LP64
add.l r2, r63, r4
add.l r3, r63, r3
#else
add r2, r63, r4
#endif
pta/l 1f, tr1
pta/l 2f, tr2
pta/l 3f, tr3
ptabs/u r18, tr0
movi 0, r5
movi 'a', r6
movi 'z', r7
movi 'A', r8
movi 'Z', r9
1: ldx.ub r4, r5, r0 /* r0 = *s1 */
ldx.ub r3, r5, r1 /* r1 = *s2 */
beq/u r0, r63, tr3 /* If *s1 == '\0', return result */
addi r5, 1, r5 /* s1++, s2++ */
beq/l r0, r1, tr1 /* Loop if the two characters match */
/*
* if (r0 >= 'A' && r0 <= 'Z' && r1 >= 'a' && r1 <= 'z')
* r0 = tolower(r0);
*/
cmpgtu r8, r0, r19 /* r19 == 1 IFF r0 < 'A', else 0 */
cmpgtu r0, r9, r20 /* r20 == 1 IFF r0 > 'Z', else 0 */
cmpgtu r6, r1, r21 /* r21 == 1 IFF r1 < 'a', else 0 */
cmpgtu r1, r7, r22 /* r22 == 1 IFF r1 > 'z', else 0 */
or r19, r20, r19 /* r19 == 0 if 'A' <= r0 <= 'Z' */
or r21, r22, r21 /* r21 == 0 if 'a' <= r1 <= 'z' */
or r19, r21, r19 /* Combine results */
addi r0, 'a' - 'A', r20
cmveq r19, r20, r0 /* r0 = tolower(r0) */
beq/u r19, r63, tr2
/*
* else if (r0 >= 'a' && r0 <= 'a' && r1 >= 'A' && r1 <= 'Z')
* r1 = tolower(r1);
*/
cmpgtu r6, r0, r19 /* r19 == 1 IFF r0 < 'a', else 0 */
cmpgtu r0, r7, r20 /* r20 == 1 IFF r0 > 'z', else 0 */
cmpgtu r8, r1, r21 /* r21 == 1 IFF r1 < 'A', else 0 */
cmpgtu r1, r9, r22 /* r22 == 1 IFF r1 > 'Z', else 0 */
or r19, r20, r19 /* r19 == 0 if 'a' <= r0 <= 'a' */
or r21, r22, r21 /* r21 == 0 if 'A' <= r1 <= 'Z' */
or r19, r21, r19 /* Combine results */
addi r1, 'a' - 'A', r20
cmveq r19, r20, r1 /* r1 = tolower(r1) */
2: beq/l r0, r1, tr1 /* Back for more if they match */
3: sub r0, r1, r2 /* r2 = r0 - r1 */
blink tr0, r63 /* Else, return result to caller */