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132 lines
3.4 KiB
ArmAsm
132 lines
3.4 KiB
ArmAsm
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/* Optimized memcmp implementation for PowerPC476.
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Copyright (C) 2010 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA
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02110-1301 USA. */
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#include <sysdep.h>
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#include <bp-sym.h>
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#include <bp-asm.h>
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/* memcmp
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r3:source1 address, return equality
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r4:source2 address
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r5:byte count
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Check 2 words from src1 and src2. If unequal jump to end and
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return src1 > src2 or src1 < src2.
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If count = zero check bytes before zero counter and then jump to end and
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return src1 > src2, src1 < src2 or src1 = src2.
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If src1 = src2 and no null, repeat. */
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EALIGN (BP_SYM (memcmp), 5, 0)
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srwi. r6,r5,5
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beq L(preword2_count_loop)
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mtctr r6
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clrlwi r5,r5,27
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L(word8_compare_loop):
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lwz r10,0(r3)
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lwz r6,4(r3)
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lwz r8,0(r4)
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lwz r9,4(r4)
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cmplw cr5,r8,r10
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cmplw cr1,r9,r6
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bne cr5,L(st2)
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bne cr1,L(st1)
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lwz r10,8(r3)
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lwz r6,12(r3)
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lwz r8,8(r4)
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lwz r9,12(r4)
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cmplw cr5,r8,r10
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cmplw cr1,r9,r6
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bne cr5,L(st2)
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bne cr1,L(st1)
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lwz r10,16(r3)
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lwz r6,20(r3)
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lwz r8,16(r4)
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lwz r9,20(r4)
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cmplw cr5,r8,r10
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cmplw cr1,r9,r6
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bne cr5,L(st2)
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bne cr1,L(st1)
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lwz r10,24(r3)
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lwz r6,28(r3)
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addi r3,r3,0x20
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lwz r8,24(r4)
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lwz r9,28(r4)
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addi r4,r4,0x20
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cmplw cr5,r8,r10
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cmplw cr1,r9,r6
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bne cr5,L(st2)
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bne cr1,L(st1)
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bdnz L(word8_compare_loop)
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L(preword2_count_loop):
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srwi. r6,r5,3
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beq L(prebyte_count_loop)
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mtctr r6
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clrlwi r5,r5,29
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L(word2_count_loop):
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lwz r10,0(r3)
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lwz r6,4(r3)
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addi r3,r3,0x08
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lwz r8,0(r4)
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lwz r9,4(r4)
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addi r4,r4,0x08
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cmplw cr5,r8,r10
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cmplw cr1,r9,r6
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bne cr5,L(st2)
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bne cr1,L(st1)
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bdnz L(word2_count_loop)
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L(prebyte_count_loop):
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addi r5,r5,1
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mtctr r5
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bdz L(end_memcmp)
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L(byte_count_loop):
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lbz r6,0(r3)
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addi r3,r3,0x01
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lbz r8,0(r4)
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addi r4,r4,0x01
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cmplw cr5,r8,r6
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bne cr5,L(st2)
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bdnz L(byte_count_loop)
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L(end_memcmp):
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addi r3,r0,0
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blr
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L(l_r):
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addi r3,r0,1
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blr
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L(st1):
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blt cr1,L(l_r)
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addi r3,r0,-1
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blr
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L(st2):
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blt cr5,L(l_r)
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addi r3,r0,-1
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blr
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END (BP_SYM (memcmp))
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libc_hidden_builtin_def (memcmp)
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weak_alias (memcmp,bcmp)
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