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+/* Copyright (C) 2004 Jean-Marc Valin */
+/**
+ @file ltp_arm4.h
+ @brief Long-Term Prediction functions (ARM4 version)
+*/
+/*
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ - Neither the name of the Xiph.org Foundation nor the names of its
+ contributors may be used to endorse or promote products derived from
+ this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
+ CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#define OVERRIDE_INNER_PROD
+spx_word32_t inner_prod(const spx_word16_t *x, const spx_word16_t *y, int len)
+{
+ spx_word32_t sum1=0,sum2=0;
+ spx_word16_t *deadx, *deady;
+ int deadlen, dead1, dead2, dead3, dead4, dead5, dead6;
+ __asm__ __volatile__ (
+ "\tldrsh %5, [%0], #2 \n"
+ "\tldrsh %6, [%1], #2 \n"
+ ".inner_prod_loop%=:\n"
+ "\tsub %7, %7, %7\n"
+ "\tsub %10, %10, %10\n"
+
+ "\tldrsh %8, [%0], #2 \n"
+ "\tldrsh %9, [%1], #2 \n"
+ "\tmla %7, %5, %6, %7\n"
+ "\tldrsh %5, [%0], #2 \n"
+ "\tldrsh %6, [%1], #2 \n"
+ "\tmla %10, %8, %9, %10\n"
+ "\tldrsh %8, [%0], #2 \n"
+ "\tldrsh %9, [%1], #2 \n"
+ "\tmla %7, %5, %6, %7\n"
+ "\tldrsh %5, [%0], #2 \n"
+ "\tldrsh %6, [%1], #2 \n"
+ "\tmla %10, %8, %9, %10\n"
+
+ "\tldrsh %8, [%0], #2 \n"
+ "\tldrsh %9, [%1], #2 \n"
+ "\tmla %7, %5, %6, %7\n"
+ "\tldrsh %5, [%0], #2 \n"
+ "\tldrsh %6, [%1], #2 \n"
+ "\tmla %10, %8, %9, %10\n"
+ "\tldrsh %8, [%0], #2 \n"
+ "\tldrsh %9, [%1], #2 \n"
+ "\tmla %7, %5, %6, %7\n"
+ "\tldrsh %5, [%0], #2 \n"
+ "\tldrsh %6, [%1], #2 \n"
+ "\tmla %10, %8, %9, %10\n"
+
+ "\tsubs %4, %4, #1\n"
+ "\tadd %2, %2, %7, asr #5\n"
+ "\tadd %3, %3, %10, asr #5\n"
+ "\tbne .inner_prod_loop%=\n"
+ : "=r" (deadx), "=r" (deady), "+r" (sum1), "+r" (sum2),
+ "=r" (deadlen), "=r" (dead1), "=r" (dead2), "=r" (dead3),
+ "=r" (dead4), "=r" (dead5), "=r" (dead6)
+ : "0" (x), "1" (y), "4" (len>>3)
+ : "cc"
+ );
+ return (sum1+sum2)>>1;
+}
+
+#define OVERRIDE_PITCH_XCORR
+void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *corr, int len, int nb_pitch, char *stack)
+{
+ int i,j;
+ for (i=0;i<nb_pitch;i+=4)
+ {
+ /* Compute correlation*/
+ //corr[nb_pitch-1-i]=inner_prod(x, _y+i, len);
+ spx_word32_t sum1=0;
+ spx_word32_t sum2=0;
+ spx_word32_t sum3=0;
+ spx_word32_t sum4=0;
+ const spx_word16_t *y = _y+i;
+ const spx_word16_t *x = _x;
+ spx_word32_t y0, y1, y2, y3;
+ y0=*y++;
+ y1=*y++;
+ y2=*y++;
+ y3=*y++;
+ for (j=0;j<len;j+=4)
+ {
+ spx_word32_t part1, part2, part3, part4, x0;
+ spx_word32_t dead1;
+ __asm__ __volatile__ (
+#ifdef SHORTCUTS
+ "\tldrsh %10, [%8], #4 \n"
+ "\tmul %4, %10, %0 \n"
+ "\tldrsh %15, [%8], #4 \n"
+ "\tmul %5, %10, %1 \n"
+ "\tldrsh %0, [%9], #2 \n"
+ "\tmul %6, %10, %2 \n"
+ "\tldrsh %1, [%9], #2 \n"
+ "\tmul %7, %10, %3 \n"
+
+
+ "\tmla %4, %15, %2, %4 \n"
+ "\tldrsh %2, [%9], #2 \n"
+ "\tmla %5, %15, %3, %5 \n"
+ "\tldrsh %3, [%9], #2 \n"
+ "\tmla %6, %15, %0, %6 \n"
+ "\tmla %7, %15, %1, %7 \n"
+
+#else
+ "\tldrsh %10, [%8], #2 \n"
+ "\tmul %4, %10, %0 \n"
+ "\tmul %5, %10, %1 \n"
+ "\tmul %6, %10, %2 \n"
+ "\tmul %7, %10, %3 \n"
+
+ "\tldrsh %10, [%8], #2 \n"
+ "\tldrsh %0, [%9], #2 \n"
+ "\tmla %4, %10, %1, %4 \n"
+ "\tmla %5, %10, %2, %5 \n"
+ "\tmla %6, %10, %3, %6 \n"
+ "\tmla %7, %10, %0, %7 \n"
+
+ "\tldrsh %10, [%8], #2 \n"
+ "\tldrsh %1, [%9], #2 \n"
+ "\tmla %4, %10, %2, %4 \n"
+ "\tmla %5, %10, %3, %5 \n"
+ "\tmla %6, %10, %0, %6 \n"
+ "\tmla %7, %10, %1, %7 \n"
+
+ "\tldrsh %10, [%8], #2 \n"
+ "\tldrsh %2, [%9], #2 \n"
+ "\tmla %4, %10, %3, %4 \n"
+ "\tmla %5, %10, %0, %5 \n"
+ "\tmla %6, %10, %1, %6 \n"
+ "\tmla %7, %10, %2, %7 \n"
+
+ "\tldrsh %3, [%9], #2 \n"
+#endif
+
+ "\tldr %10, %11 \n"
+ "\tldr %15, %12 \n"
+ "\tadd %4, %10, %4, asr #6 \n"
+ "\tstr %4, %11 \n"
+ "\tldr %10, %13 \n"
+ "\tadd %5, %15, %5, asr #6 \n"
+ "\tstr %5, %12 \n"
+ "\tldr %15, %14 \n"
+ "\tadd %6, %10, %6, asr #6 \n"
+ "\tadd %7, %15, %7, asr #6 \n"
+ "\tstr %6, %13 \n"
+ "\tstr %7, %14 \n"
+
+ : "+r" (y0), "+r" (y1), "+r" (y2), "+r" (y3),
+ "=r" (part1), "=r" (part2), "=r" (part3), "=r" (part4),
+ "+r" (x), "+r" (y), "=r" (x0), "+m" (sum1),
+ "+m" (sum2), "+m" (sum3), "+m" (sum4), "=r" (dead1)
+ :
+ : "cc", "memory"
+ );
+ }
+ corr[nb_pitch-1-i]=sum1;
+ corr[nb_pitch-2-i]=sum2;
+ corr[nb_pitch-3-i]=sum3;
+ corr[nb_pitch-4-i]=sum4;
+ }
+
+}
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