135 lines
3.6 KiB
ArmAsm
135 lines
3.6 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/strncpy.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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/* If dst and src are 4 byte aligned, copy 8 bytes at a time.
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If the src is 4, but not 8 byte aligned, we first read 4 bytes to get
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it 8 byte aligned. Thus, we can do a little read-ahead, without
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dereferencing a cache line that we should not touch. */
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#if defined (__ARC601__) || !defined (__ARC_BARREL_SHIFTER__)
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#define BRand(a,b,l) and a,a,b ` brne_s a,0,l
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ENTRY (strncpy)
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cmp_s r2,8
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or r12,r0,r1
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bmsk.cc.f r12,r12,1
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brne.d r12,0,.Lbytewise
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mov_s r10,r0
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ld_s r3,[r1,0]
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mov r8,0x01010101
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add r6,r0,r2
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sub r6,r6,8
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bbit0.d r1,2,.Loop_start
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ror r11,r8
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sub r12,r3,r8
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bic_l r12,r12,r3
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BRand (r12,r11,.Lr3z)
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mov_s r4,r3
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ld.a r3,[r1,4]
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st.ab r4,[r10,4]
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.balign 4
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.Loop_start:
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brhs r10,r6,.Loop_end
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1:
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ld.a r4,[r1,4]
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sub r12,r3,r8
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bic_s r12,r12,r3
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BRand (r12,r11,.Lr3z2)
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st.ab r3,[r10,8]
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sub r12,r4,r8
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bic r12,r12,r4
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BRand (r12,r11,.Lr4z)
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ld.a r3,[r1,4]
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brlo.d r10,r6,1b
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st r4,[r10,-4]
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.Loop_end:
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add r6,r6,4
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brhs r10,r6,.Lastword
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sub r12,r3,r8
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bic_s r12,r12,r3
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BRand (r12,r11,.Lr3z)
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add_s r1,r1,4
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st.ab r3,[r10,4]
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.Lastword:
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sub_s r2,r2,1
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b.d .Lstart_charloop
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bmsk.f r2,r2,1
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.balign 4
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nop_s
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.Lr3z2: sub_s r1,r1,4
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.Lr4z:
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.Lr3z:
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.balign 4
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.Lr3z_loop:
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ldb.ab r3,[r1,1]
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brne.d r3,0,.Lr3z_loop
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stb.ab r3,[r10,1]
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.Lzero_rest:
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; __strncpy_bzero requires:
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; return value in r0
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; zeroing length in r2
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; zeroing start address in r3
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mov_s r3,r10
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add_s r2,r2,r0
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b.d __strncpy_bzero
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sub_s r2,r2,r3
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.balign 4
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.Lbytewise:
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sub.f r2,r2,1
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jcs [blink]
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.Lstart_charloop:
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mov_s r3,r10
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.Lcharloop:
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ldb.ab r12,[r1,1]
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beq.d .Last_byte
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sub.f r2,r2,1
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brne.d r12,0,.Lcharloop
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stb.ab r12,[r3,1]
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b.d __strncpy_bzero
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stb.ab r12,[r3,1]
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.Last_byte:
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j_s.d [blink]
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stb_s r12,[r3]
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ENDFUNC (strncpy)
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#endif /* __ARC601__ || !__ARC_BARREL_SHIFTER__ */
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#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */
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