48 lines
676 B
ArmAsm
48 lines
676 B
ArmAsm
/*
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* Copyright 2005-2009 Analog Devices Inc.
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*
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* Licensed under the Clear BSD license or the GPL-2 (or later)
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*/
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#include <linux/linkage.h>
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/* void *memchr(const void *s, int c, size_t n);
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* R0 = address (s)
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* R1 = sought byte (c)
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* R2 = count (n)
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*
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* Returns pointer to located character.
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*/
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.text
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.align 2
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ENTRY(_memchr)
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P0 = R0; /* P0 = address */
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P2 = R2; /* P2 = count */
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R1 = R1.B(Z);
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CC = R2 == 0;
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IF CC JUMP .Lfailed;
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.Lbytes:
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LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2;
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.Lbyte_loop_s:
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R3 = B[P0++](Z);
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CC = R3 == R1;
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IF CC JUMP .Lfound;
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.Lbyte_loop_e:
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NOP;
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.Lfailed:
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R0=0;
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RTS;
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.Lfound:
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R0 = P0;
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R0 += -1;
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RTS;
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ENDPROC(_memchr)
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