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ltp_sse.h

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00001 /* Copyright (C) 2002 Jean-Marc Valin 
00002    File: ltp.c
00003    Lont-Term Prediction functions
00004 
00005    Redistribution and use in source and binary forms, with or without
00006    modification, are permitted provided that the following conditions
00007    are met:
00008    
00009    - Redistributions of source code must retain the above copyright
00010    notice, this list of conditions and the following disclaimer.
00011    
00012    - Redistributions in binary form must reproduce the above copyright
00013    notice, this list of conditions and the following disclaimer in the
00014    documentation and/or other materials provided with the distribution.
00015    
00016    - Neither the name of the Xiph.org Foundation nor the names of its
00017    contributors may be used to endorse or promote products derived from
00018    this software without specific prior written permission.
00019    
00020    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00021    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00022    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
00023    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
00024    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00025    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00026    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00027    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00028    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00029    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00030    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00031 */
00032 
00033 
00034 static float inner_prod(float *a, float *b, int len)
00035 {
00036   float sum;
00037   __asm__ __volatile__ (
00038   "\tpush %%eax\n"
00039   "\tpush %%edi\n"
00040   "\tpush %%ecx\n"
00041   "\txorps %%xmm3, %%xmm3\n"
00042   "\txorps %%xmm4, %%xmm4\n"
00043 
00044   "\tsub $20, %%ecx\n"
00045 
00046 ".mul20_loop%=:\n"
00047 
00048   "\tmovups (%%eax), %%xmm0\n"
00049   "\tmovups (%%edi), %%xmm1\n"
00050   "\tmulps %%xmm0, %%xmm1\n"
00051 
00052   "\tmovups 16(%%eax), %%xmm5\n"
00053   "\tmovups 16(%%edi), %%xmm6\n"
00054   "\tmulps %%xmm5, %%xmm6\n"
00055   "\taddps %%xmm1, %%xmm3\n"
00056 
00057   "\tmovups 32(%%eax), %%xmm0\n"
00058   "\tmovups 32(%%edi), %%xmm1\n"
00059   "\tmulps %%xmm0, %%xmm1\n"
00060   "\taddps %%xmm6, %%xmm4\n"
00061 
00062   "\tmovups 48(%%eax), %%xmm5\n"
00063   "\tmovups 48(%%edi), %%xmm6\n"
00064   "\tmulps %%xmm5, %%xmm6\n"
00065   "\taddps %%xmm1, %%xmm3\n"
00066 
00067   "\tmovups 64(%%eax), %%xmm0\n"
00068   "\tmovups 64(%%edi), %%xmm1\n"
00069   "\tmulps %%xmm0, %%xmm1\n"
00070   "\taddps %%xmm6, %%xmm4\n"
00071   "\taddps %%xmm1, %%xmm3\n"
00072 
00073 
00074   "\tadd $80, %%eax\n"
00075   "\tadd $80, %%edi\n"
00076 
00077   "\tsub $20,  %%ecx\n"
00078 
00079   "\tjae .mul20_loop%=\n"
00080 
00081   "\taddps %%xmm4, %%xmm3\n"
00082 
00083   "\tmovhlps %%xmm3, %%xmm4\n"
00084   "\taddps %%xmm4, %%xmm3\n"
00085   "\tmovaps %%xmm3, %%xmm4\n"
00086   "\tshufps $0x55, %%xmm4, %%xmm4\n"
00087   "\taddss %%xmm4, %%xmm3\n"
00088   "\tmovss %%xmm3, (%%edx)\n"
00089   
00090   "\tpop %%ecx\n"
00091   "\tpop %%edi\n"
00092   "\tpop %%eax\n"
00093   : : "a" (a), "D" (b), "c" (len), "d" (&sum) : "memory");
00094   return sum;
00095 }

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