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[/] [c0or1k/] [trunk/] [src/] [arch/] [arm/] [memset.S.ARM] - Diff between revs 2 and 6
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Rev 6 |
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?rev2line? |
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/*
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* Copyright 2010 (C) B Labs.
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* Author: Prem Mallappa
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* Description: Optimized memset for ARM
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*/
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#include INC_ARCH(asm.h)
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/*
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void *
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memset(void *dst, int c, int len)
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*/
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BEGIN_PROC(_memset)
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stmfd sp!, {r4 - r11, lr}
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and r1, r1, #255 /* c &= 0xff */
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orr r1, r1, lsl #8 /* c |= c<<8 */
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orr r1, r1, lsl #16 /* c |= c<<16 */
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mov r4, r1
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cmp r2, #8
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blt 4f
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movge r5, r4
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cmpge r2, #16
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blt 8f
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movge r6, r4
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movge r7, r4
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cmpge r2, #32
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blt 16f
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movge r8, r4
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movge r9, r4
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movge r10, r4
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movge r11, r4
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32:
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cmp r2, #32
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blt 16f
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stmia r0!, {r4 - r11}
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sub r2, r2, #32
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b 32b
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16:
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cmp r2, #16
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blt 8f
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stmia r0!, {r4 - r7}
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sub r2, r2, #16
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b 16b
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8:
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cmp r2, #8
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blt 4f
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stmia r0!, {r4, r5}
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sub r2, r2, #8
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b 8b
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4:
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cmp r2, #4
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blt end
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stmia r0!, {r4}
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sub r2, r2, #4
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b 4b
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end:
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teq r2, #0
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strneb r4, [r0, #0]
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subne r2, r2, #1
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addne r0, r0, #1
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bne end
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ldmfd sp!, {r4 - r11, pc}
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END_PROC(_memset)
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