/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: mmxstate.c 17247 2010-05-28 05:35:32Z tterribe $
********************************************************************/
#include "x86enc.h"
#if defined(OC_X86_ASM)
/*The default enquant table is not quite suitable for SIMD purposes.
First, the m and l parameters need to be separated so that an entire row full
of m's or l's can be loaded at a time.
Second, x86 SIMD has no element-wise arithmetic right-shift, so we have to
emulate one with a multiply.
Therefore we translate the shift count into a scale factor.*/
void oc_enc_enquant_table_init_x86(void *_enquant,
const ogg_uint16_t _dequant[64]){
ogg_int16_t *m;
ogg_int16_t *l;
int zzi;
m=(ogg_int16_t *)_enquant;
l=m+64;
for(zzi=0;zzi<64;zzi++){
oc_iquant q;
oc_iquant_init(&q,_dequant[zzi]);
m[zzi]=q.m;
/*q.l must be at least 2 for this to work; fortunately, once all the scale
factors are baked in, the minimum quantizer is much larger than that.*/
l[zzi]=1<<16-q.l;
}
}
void oc_enc_enquant_table_fixup_x86(void *_enquant[3][3][2],int _nqis){
int pli;
int qii;
int qti;
for(pli=0;pli<3;pli++)for(qii=1;qii<_nqis;qii++)for(qti=0;qti<2;qti++){
((ogg_int16_t *)_enquant[pli][qii][qti])[0]=
((ogg_int16_t *)_enquant[pli][0][qti])[0];
((ogg_int16_t *)_enquant[pli][qii][qti])[64]=
((ogg_int16_t *)_enquant[pli][0][qti])[64];
}
}
int oc_enc_quantize_sse2(ogg_int16_t _qdct[64],const ogg_int16_t _dct[64],
const ogg_uint16_t _dequant[64],const void *_enquant){
ptrdiff_t r;
__asm__ __volatile__(
"xor %[r],%[r]\n\t"
/*Loop through two rows at a time.*/
".p2align 4\n\t"
"0:\n\t"
/*Load the first two rows of the data and the quant matrices.*/
"movdqa 0x00(%[dct],%[r]),%%xmm0\n\t"
"movdqa 0x10(%[dct],%[r]),%%xmm1\n\t"
"movdqa 0x00(%[dq],%[r]),%%xmm2\n\t"
"movdqa 0x10(%[dq],%[r]),%%xmm3\n\t"
"movdqa 0x00(%[q],%[r]),%%xmm4\n\t"
"movdqa 0x10(%[q],%[r]),%%xmm5\n\t"
/*Double the input and propagate its sign to the rounding factor.
Using SSSE3's psignw would help here, but we need the mask later anyway.*/
"movdqa %%xmm0,%%xmm6\n\t"
"psraw $15,%%xmm0\n\t"
"movdqa %%xmm1,%%xmm7\n\t"
"paddw %%xmm6,%%xmm6\n\t"
"psraw $15,%%xmm1\n\t"
"paddw %%xmm7,%%xmm7\n\t"
"paddw %%xmm0,%%xmm2\n\t"
"paddw %%xmm1,%%xmm3\n\t"
"pxor %%xmm0,%%xmm2\n\t"
"pxor %%xmm1,%%xmm3\n\t"
/*Add the rounding factor and perform the first multiply.*/
"paddw %%xmm2,%%xmm6\n\t"
"paddw %%xmm3,%%xmm7\n\t"
"pmulhw %%xmm6,%%xmm4\n\t"
"pmulhw %%xmm7,%%xmm5\n\t"
"movdqa 0x80(%[q],%[r]),%%xmm2\n\t"
"movdqa 0x90(%[q],%[r]),%%xmm3\n\t"
"paddw %%xmm4,%%xmm6\n\t"
"paddw %%xmm5,%%xmm7\n\t"
/*Emulate an element-wise right-shift via a second multiply.*/
"pmulhw %%xmm2,%%xmm6\n\t"
"pmulhw %%xmm3,%%xmm7\n\t"
"add $32,%[r]\n\t"
"cmp $96,%[r]\n\t"
/*Correct for the sign.*/
"psubw %%xmm0,%%xmm6\n\t"
"psubw %%xmm1,%%xmm7\n\t"
/*Save the result.*/
"movdqa %%xmm6,-0x20(%[qdct],%[r])\n\t"
"movdqa %%xmm7,-0x10(%[qdct],%[r])\n\t"
"jle 0b\n\t"
/*Now find the location of the last non-zero value.*/
"movdqa 0x50(%[qdct]),%%xmm5\n\t"
"movdqa 0x40(%[qdct]),%%xmm4\n\t"
"packsswb %%xmm7,%%xmm6\n\t"
"packsswb %%xmm5,%%xmm4\n\t"
"pxor %%xmm0,%%xmm0\n\t"
"mov $-1,%k[dq]\n\t"
"pcmpeqb %%xmm0,%%xmm6\n\t"
"pcmpeqb %%xmm0,%%xmm4\n\t"
"pmovmskb %%xmm6,%k[q]\n\t"
"pmovmskb %%xmm4,%k[r]\n\t"
"shl $16,%k[q]\n\t"
"or %k[r],%k[q]\n\t"
"mov $32,%[r]\n\t"
/*We have to use xor here instead of not in order to set the flags.*/
"xor %k[dq],%k[q]\n\t"
"jnz 1f\n\t"
"movdqa 0x30(%[qdct]),%%xmm7\n\t"
"movdqa 0x20(%[qdct]),%%xmm6\n\t"
"movdqa 0x10(%[qdct]),%%xmm5\n\t"
"movdqa 0x00(%[qdct]),%%xmm4\n\t"
"packsswb %%xmm7,%%xmm6\n\t"
"packsswb %%xmm5,%%xmm4\n\t"
"pcmpeqb %%xmm0,%%xmm6\n\t"
"pcmpeqb %%xmm0,%%xmm4\n\t"
"pmovmskb %%xmm6,%k[q]\n\t"
"pmovmskb %%xmm4,%k[r]\n\t"
"shl $16,%k[q]\n\t"
"or %k[r],%k[q]\n\t"
"xor %[r],%[r]\n\t"
"not %k[q]\n\t"
"or $1,%k[q]\n\t"
"1:\n\t"
"bsr %k[q],%k[q]\n\t"
"add %k[q],%k[r]\n\t"
:[r]"=&a"(r),[q]"+r"(_enquant),[dq]"+r"(_dequant)
:[dct]"r"(_dct),[qdct]"r"(_qdct)
:"cc","memory"
);
return (int)r;
}
#endif
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