dc8692ba94
See USE_SOFTWARE_CACHE in Bullet\src\BulletMultiThreaded\SpuNarrowPhaseCollisionTask\SpuGatheringCollisionTask.cpp It improves the Bullet midphase collision detection (triangle/vertex fetch) The license is CommonPublicLicense-1.0, see included license docs.
69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/* @(#)85 1.4 src/lib/c/memset.h, sw.lib, sdk_pub 10/13/05 10:17:09 */
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/* -------------------------------------------------------------- */
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/* (C) Copyright 2001,2005, */
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/* International Business Machines Corporation, */
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/* Sony Computer Entertainment Incorporated, */
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/* Toshiba Corporation. */
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/* */
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/* All Rights Reserved. */
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/* -------------------------------------------------------------- */
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/* PROLOG END TAG zYx */
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#include <spu_intrinsics.h>
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#include <stddef.h>
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/* Fills the first n bytes of the memory area pointed to by s
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* with the constant byte c. Returns a pointer to the memory area s.
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*/
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static __inline void * _memset(void *s, int c, size_t n)
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{
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int skip, cnt, i;
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vec_uchar16 *vs;
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vec_uchar16 vc, mask;
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vs = (vec_uchar16 *)(s);
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vc = spu_splats((unsigned char)c);
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cnt = (int)(n);
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/* Handle any leading partial quadwords as well a
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* very short settings (ie, such that the n characters
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* all reside in a single quadword.
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*/
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skip = (int)(s) & 15;
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if (skip) {
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mask = spu_rlmaskqwbyte((vec_uchar16)(-1), 0-skip);
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cnt -= 16 - skip;
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if (cnt < 0) {
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mask = spu_and(mask, spu_slqwbyte((vec_uchar16)(-1), (unsigned int)(-cnt)));
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}
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*vs = spu_sel(*vs, vc, mask);
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vs++;
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}
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/* Handle 8 quadwords at a time
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*/
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for (i=127; i<cnt; cnt-=8*16) {
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vs[0] = vc;
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vs[1] = vc;
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vs[2] = vc;
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vs[3] = vc;
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vs[4] = vc;
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vs[5] = vc;
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vs[6] = vc;
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vs[7] = vc;
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vs += 8;
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}
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/* Finish all remaining complete quadwords
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*/
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for (i=15; i<cnt; cnt-=16) *vs++ = vc;
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/* Handle any trailing partial quadwords
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*/
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if (cnt > 0) {
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mask = spu_slqwbyte((vec_uchar16)(-1), (unsigned int)(16-cnt));
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*vs = spu_sel(*vs, vc, mask);
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}
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return (s);
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}
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