--- /dev/null
+/*****************************************************************************
+ * memcpy.c : AltiVec memcpy module
+ *****************************************************************************
+ * Copyright (C) 2001 the VideoLAN team
+ * $Id$
+ *
+ * Author: Christophe Massiot <massiot@via.ecp.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifndef __BUILD_ALTIVEC_ASM__
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_cpu.h>
+
+#ifdef HAVE_ALTIVEC_H
+# include <altivec.h>
+#endif
+
+/*****************************************************************************
+ * Local prototypes.
+ *****************************************************************************/
+static void * fast_memcpy ( void * to, const void * from, size_t len );
+
+/*****************************************************************************
+ * Module initializer.
+ *****************************************************************************/
+static int Activate ( vlc_object_t *p_this )
+{
+ VLC_UNUSED(p_this);
+ vlc_fastmem_register( fast_memcpy, NULL );
+ return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * Module descriptor.
+ *****************************************************************************/
+vlc_module_begin ()
+ set_description( N_("AltiVec memcpy") )
+ set_category( CAT_ADVANCED )
+ set_subcategory( SUBCAT_ADVANCED_MISC )
+ set_capability( "memcpy", 100 )
+ set_callbacks( Activate, NULL )
+ add_shortcut( "altivec" )
+vlc_module_end ()
+
+#else
+typedef unsigned long size_t;
+#endif /* __BUILD_ALTIVEC_ASM__ */
+
+#if defined(CAN_COMPILE_C_ALTIVEC) || defined( __BUILD_ALTIVEC_ASM__ )
+
+#define vector_s16_t vector signed short
+#define vector_u16_t vector unsigned short
+#define vector_s8_t vector signed char
+#define vector_u8_t vector unsigned char
+#define vector_s32_t vector signed int
+#define vector_u32_t vector unsigned int
+#define MMREG_SIZE 16
+
+#define SMALL_MEMCPY(to, from, len) \
+{ \
+ unsigned char * end = to + len; \
+ while( to < end ) \
+ { \
+ *to++ = *from++; \
+ } \
+}
+
+static void * fast_memcpy( void * _to, const void * _from, size_t len )
+{
+ void * retval = _to;
+ unsigned char * to = (unsigned char *)_to;
+ unsigned char * from = (unsigned char *)_from;
+
+ if( len > 16 )
+ {
+ /* Align destination to MMREG_SIZE -boundary */
+ register unsigned long int delta;
+
+ delta = ((unsigned long)to)&(MMREG_SIZE-1);
+ if( delta )
+ {
+ delta = MMREG_SIZE - delta;
+ len -= delta;
+ SMALL_MEMCPY(to, from, delta);
+ }
+
+ if( len & ~(MMREG_SIZE-1) )
+ {
+ vector_u8_t perm, ref0, ref1, tmp;
+
+ perm = vec_lvsl( 0, from );
+ ref0 = vec_ld( 0, from );
+ ref1 = vec_ld( 15, from );
+ from += 16;
+ len -= 16;
+ tmp = vec_perm( ref0, ref1, perm );
+ while( len & ~(MMREG_SIZE-1) )
+ {
+ ref0 = vec_ld( 0, from );
+ ref1 = vec_ld( 15, from );
+ from += 16;
+ len -= 16;
+ vec_st( tmp, 0, to );
+ tmp = vec_perm( ref0, ref1, perm );
+ to += 16;
+ }
+ vec_st( tmp, 0, to );
+ to += 16;
+ }
+ }
+
+ if( len )
+ {
+ SMALL_MEMCPY( to, from, len );
+ }
+
+ return retval;
+}
+
+#endif
+
+#if !defined(CAN_COMPILE_C_ALTIVEC) && !defined(__BUILD_ALTIVEC_ASM__)
+
+/*
+ * The asm code is generated with:
+ *
+ * gcc-2.95 -fvec -D__BUILD_ALTIVEC_ASM__ -O9 -fomit-frame-pointer -mregnames -S * memcpyaltivec.c
+ *
+ * sed 's/.L/._L/g' memcpyaltivec.s |
+ * awk '{args=""; len=split ($2, arg, ",");
+ * for (i=1; i<=len; i++) { a=arg[i]; if (i<len) a=a",";
+ * args = args sprintf ("%-6s", a) }
+ * printf ("\t\"\t%-16s%-24s\\n\"\n", $1, args) }' |
+ * unexpand -a
+ */
+
+static void * fast_memcpy( void * _to, const void * _from, size_t len )
+{
+ asm (" \n"
+ " cmplwi %cr0, %r5, 16 \n"
+ " mr %r9, %r3 \n"
+ " bc 4, 1, ._L3 \n"
+ " andi. %r0, %r3, 15 \n"
+ " bc 12, 2, ._L4 \n"
+ " subfic %r0, %r0, 16 \n"
+ " add %r11, %r3, %r0 \n"
+ " cmplw %cr0, %r3, %r11 \n"
+ " subf %r5, %r0, %r5 \n"
+ " bc 4, 0, ._L4 \n"
+ " ._L7: \n"
+ " lbz %r0, 0(%r4) \n"
+ " stb %r0, 0(%r9) \n"
+ " addi %r9, %r9, 1 \n"
+ " cmplw %cr0, %r9, %r11 \n"
+ " addi %r4, %r4, 1 \n"
+ " bc 12, 0, ._L7 \n"
+ " ._L4: \n"
+ " rlwinm. %r0, %r5, 0, 0, 27 \n"
+ " bc 12, 2, ._L3 \n"
+ " addi %r5, %r5, -16 \n"
+ " li %r11, 15 \n"
+ " lvsl %v12, 0, %r4 \n"
+ " lvx %v1, 0, %r4 \n"
+ " lvx %v0, %r11, %r4 \n"
+ " rlwinm. %r0, %r5, 0, 0, 27 \n"
+ " vperm %v13, %v1, %v0, %v12 \n"
+ " addi %r4, %r4, 16 \n"
+ " bc 12, 2, ._L11 \n"
+ " ._L12: \n"
+ " addi %r5, %r5, -16 \n"
+ " li %r11, 15 \n"
+ " lvx %v1, 0, %r4 \n"
+ " lvx %v0, %r11, %r4 \n"
+ " rlwinm. %r0, %r5, 0, 0, 27 \n"
+ " stvx %v13, 0, %r9 \n"
+ " vperm %v13, %v1, %v0, %v12 \n"
+ " addi %r4, %r4, 16 \n"
+ " addi %r9, %r9, 16 \n"
+ " bc 4, 2, ._L12 \n"
+ " ._L11: \n"
+ " stvx %v13, 0, %r9 \n"
+ " addi %r9, %r9, 16 \n"
+ " ._L3: \n"
+ " cmpwi %cr0, %r5, 0 \n"
+ " bclr 12, 2 \n"
+ " add %r5, %r9, %r5 \n"
+ " cmplw %cr0, %r9, %r5 \n"
+ " bclr 4, 0 \n"
+ " ._L17: \n"
+ " lbz %r0, 0(%r4) \n"
+ " stb %r0, 0(%r9) \n"
+ " addi %r9, %r9, 1 \n"
+ " cmplw %cr0, %r9, %r5 \n"
+ " addi %r4, %r4, 1 \n"
+ " bc 12, 0, ._L17 \n"
+ );
+}
+
+#endif
projects / vlc / blobdiff