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18 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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31 /* This implementation is optimized for performance. For code size a generic
32 implementation of this function from newlib/libc/string/memset.c will be
34 #if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) \
35 && !defined (__ARC_RF16__)
44 #define PREWRITE(A,B) prefetchw [(A),(B)]
46 #define PREWRITE(A,B) prealloc [(A),(B)]
50 prefetchw [r0] ; Prefetch the write location
54 mov r3, r0 ; don't clobber ret val
57 brls.d.nt r2, 8, .Lsmallchunk
62 lpnz @.Laligndestination
68 ; Destination is aligned
82 ; Convert len to Dwords, unfold x8
83 lsr.f lp_count, lp_count, 6
86 PREWRITE (r3, 64) ;Prefetch the next write location
116 lsr.f lp_count, r2, 5 ;Last remaining max 124 bytes
119 prefetchw [r3, 32] ;Prefetch the next write location
137 and.f lp_count, r2, 0x1F ;Last remaining 31 bytes
147 #endif /* __ARCHS__ */
149 #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */