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110 lines
2.9 KiB
ArmAsm
110 lines
2.9 KiB
ArmAsm
/*
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Copyright (c) 2015, Synopsys, Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1) Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2) Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3) Neither the name of the Synopsys, Inc., nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* This implementation is optimized for performance. For code size a generic
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implementation of this function from newlib/libc/string/strcmp.c will be
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used. */
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#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED)
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#include "asm.h"
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#ifdef __ARCHS__
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ENTRY (strcmp)
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or r2, r0, r1
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bmsk_s r2, r2, 1
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brne r2, 0, @.Lcharloop
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; s1 and s2 are word aligned
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ld.ab r2, [r0, 4]
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mov_s r12, 0x01010101
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ror r11, r12
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.align 4
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.LwordLoop:
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ld.ab r3, [r1, 4]
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; Detect NULL char in str1
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sub r4, r2, r12
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ld.ab r5, [r0, 4]
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bic r4, r4, r2
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and r4, r4, r11
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brne.d.nt r4, 0, .LfoundNULL
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; Check if the read locations are the same
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cmp r2, r3
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beq.d .LwordLoop
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mov.eq r2, r5
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; A match is found, spot it out
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#ifdef __LITTLE_ENDIAN__
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swape r3, r3
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mov_s r0, 1
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swape r2, r2
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#else
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mov_s r0, 1
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#endif
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cmp_s r2, r3
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j_s.d [blink]
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bset.lo r0, r0, 31
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.align 4
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.LfoundNULL:
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#ifdef __BIG_ENDIAN__
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swape r4, r4
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swape r2, r2
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swape r3, r3
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#endif
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; Find null byte
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ffs r0, r4
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bmsk r2, r2, r0
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bmsk r3, r3, r0
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swape r2, r2
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swape r3, r3
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; make the return value
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sub.f r0, r2, r3
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mov.hi r0, 1
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j_s.d [blink]
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bset.lo r0, r0, 31
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.align 4
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.Lcharloop:
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ldb.ab r2, [r0, 1]
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ldb.ab r3, [r1, 1]
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nop
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breq r2, 0, .Lcmpend
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breq r2, r3, .Lcharloop
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.align 4
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.Lcmpend:
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j_s.d [blink]
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sub r0, r2, r3
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ENDFUNC (strcmp)
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#endif /* __ARCHS__ */
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#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */
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