/********************************************************************
* *
* 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 http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: dsp_mmx.c 14579 2008-03-12 06:42:40Z xiphmont $
********************************************************************/
#include <stddef.h>
#include "x86enc.h"
#include "sse2trans.h"
#if defined(OC_X86_ASM)
/*Load a 4x8 array of pixels values from %[src] and %[ref] and compute their
16-bit differences.
On output, these are stored in _m0, xmm1, xmm2, and xmm3.
xmm4 and xmm5 are clobbered.*/
#define OC_LOAD_SUB_4x8(_m0) \
"#OC_LOAD_SUB_4x8\n\t" \
/*Load the first three rows.*/ \
"movq (%[src]),"_m0"\n\t" \
"movq (%[ref]),%%xmm4\n\t" \
"movq (%[src],%[ystride]),%%xmm1\n\t" \
"movq (%[ref],%[ystride]),%%xmm3\n\t" \
"movq (%[src],%[ystride],2),%%xmm2\n\t" \
"movq (%[ref],%[ystride],2),%%xmm5\n\t" \
/*Unpack and subtract.*/ \
"punpcklbw %%xmm4,"_m0"\n\t" \
"punpcklbw %%xmm4,%%xmm4\n\t" \
"punpcklbw %%xmm3,%%xmm1\n\t" \
"punpcklbw %%xmm3,%%xmm3\n\t" \
"psubw %%xmm4,"_m0"\n\t" \
"psubw %%xmm3,%%xmm1\n\t" \
/*Load the last row.*/ \
"movq (%[src],%[ystride3]),%%xmm3\n\t" \
"movq (%[ref],%[ystride3]),%%xmm4\n\t" \
/*Unpack, subtract, and advance the pointers.*/ \
"punpcklbw %%xmm5,%%xmm2\n\t" \
"punpcklbw %%xmm5,%%xmm5\n\t" \
"lea (%[src],%[ystride],4),%[src]\n\t" \
"psubw %%xmm5,%%xmm2\n\t" \
"punpcklbw %%xmm4,%%xmm3\n\t" \
"punpcklbw %%xmm4,%%xmm4\n\t" \
"lea (%[ref],%[ystride],4),%[ref]\n\t" \
"psubw %%xmm4,%%xmm3\n\t" \
/*Square and accumulate four rows of differences in _m0, xmm1, xmm2, and xmm3.
On output, xmm0 contains the sum of two of the rows, and the other two are
added to xmm7.*/
#define OC_SSD_4x8(_m0) \
"pmaddwd "_m0","_m0"\n\t" \
"pmaddwd %%xmm1,%%xmm1\n\t" \
"pmaddwd %%xmm2,%%xmm2\n\t" \
"pmaddwd %%xmm3,%%xmm3\n\t" \
"paddd %%xmm1,"_m0"\n\t" \
"paddd %%xmm3,%%xmm2\n\t" \
"paddd %%xmm2,%%xmm7\n\t" \
unsigned oc_enc_frag_ssd_sse2(const unsigned char *_src,
const unsigned char *_ref,int _ystride){
unsigned ret;
__asm__ __volatile__(
OC_LOAD_SUB_4x8("%%xmm7")
OC_SSD_4x8("%%xmm7")
OC_LOAD_SUB_4x8("%%xmm0")
OC_SSD_4x8("%%xmm0")
"paddd %%xmm0,%%xmm7\n\t"
"movdqa %%xmm7,%%xmm6\n\t"
"punpckhqdq %%xmm7,%%xmm7\n\t"
"paddd %%xmm6,%%xmm7\n\t"
"pshufd $1,%%xmm7,%%xmm6\n\t"
"paddd %%xmm6,%%xmm7\n\t"
"movd %%xmm7,%[ret]\n\t"
:[ret]"=a"(ret)
:[src]"r"(_src),[ref]"r"(_ref),[ystride]"r"((ptrdiff_t)_ystride),
[ystride3]"r"((ptrdiff_t)_ystride*3)
);
return ret;
}
static const unsigned char __attribute__((aligned(16))) OC_MASK_CONSTS[8]={
0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80
};
/*Load a 2x8 array of pixels values from %[src] and %[ref] and compute their
horizontal sums as well as their 16-bit differences subject to a mask.
%%xmm5 must contain OC_MASK_CONSTS[0...7] and %%xmm6 must contain 0.*/
#define OC_LOAD_SUB_MASK_2x8 \
"#OC_LOAD_SUB_MASK_2x8\n\t" \
/*Start the loads and expand the next 8 bits of the mask.*/ \
"shl $8,%[m]\n\t" \
"movq (%[src]),%%xmm0\n\t" \
"mov %h[m],%b[m]\n\t" \
"movq (%[ref]),%%xmm2\n\t" \
"movd %[m],%%xmm4\n\t" \
"shr $8,%[m]\n\t" \
"pshuflw $0x00,%%xmm4,%%xmm4\n\t" \
"mov %h[m],%b[m]\n\t" \
"pand %%xmm6,%%xmm4\n\t" \
"pcmpeqb %%xmm6,%%xmm4\n\t" \
/*Perform the masking.*/ \
"pand %%xmm4,%%xmm0\n\t" \
"pand %%xmm4,%%xmm2\n\t" \
/*Finish the loads while unpacking the first set of rows, and expand the next
8 bits of the mask.*/ \
"movd %[m],%%xmm4\n\t" \
"movq (%[src],%[ystride]),%%xmm1\n\t" \
"pshuflw $0x00,%%xmm4,%%xmm4\n\t" \
"movq (%[ref],%[ystride]),%%xmm3\n\t" \
"pand %%xmm6,%%xmm4\n\t" \
"punpcklbw %%xmm2,%%xmm0\n\t" \
"pcmpeqb %%xmm6,%%xmm4\n\t" \
"punpcklbw %%xmm2,%%xmm2\n\t" \
/*Mask and unpack the second set of rows.*/ \
"pand %%xmm4,%%xmm1\n\t" \
"pand %%xmm4,%%xmm3\n\t" \
"punpcklbw %%xmm3,%%xmm1\n\t" \
"punpcklbw %%xmm3,%%xmm3\n\t" \
"psubw %%xmm2,%%xmm0\n\t" \
"psubw %%xmm3,%%xmm1\n\t" \
unsigned oc_enc_frag_border_ssd_sse2(const unsigned char *_src,
const unsigned char *_ref,int _ystride,ogg_int64_t _mask){
ptrdiff_t ystride;
unsigned ret;
int i;
ystride=_ystride;
__asm__ __volatile__(
"pxor %%xmm7,%%xmm7\n\t"
"movq %[c],%%xmm6\n\t"
:
:[c]"m"(OC_CONST_ARRAY_OPERAND(unsigned char,OC_MASK_CONSTS,8))
);
for(i=0;i<4;i++){
unsigned m;
m=_mask&0xFFFF;
_mask>>=16;
if(m){
__asm__ __volatile__(
OC_LOAD_SUB_MASK_2x8
"pmaddwd %%xmm0,%%xmm0\n\t"
"pmaddwd %%xmm1,%%xmm1\n\t"
"paddd %%xmm0,%%xmm7\n\t"
"paddd %%xmm1,%%xmm7\n\t"
:[src]"+r"(_src),[ref]"+r"(_ref),[ystride]"+r"(ystride),[m]"+Q"(m)
);
}
_src+=2*ystride;
_ref+=2*ystride;
}
__asm__ __volatile__(
"movdqa %%xmm7,%%xmm6\n\t"
"punpckhqdq %%xmm7,%%xmm7\n\t"
"paddd %%xmm6,%%xmm7\n\t"
"pshufd $1,%%xmm7,%%xmm6\n\t"
"paddd %%xmm6,%%xmm7\n\t"
"movd %%xmm7,%[ret]\n\t"
:[ret]"=a"(ret)
);
return ret;
}
/*Load an 8x8 array of pixel values from %[src] and %[ref] and compute their
16-bit difference in %%xmm0...%%xmm7.*/
#define OC_LOAD_SUB_8x8 \
"#OC_LOAD_SUB_8x8\n\t" \
"movq (%[src]),%%xmm0\n\t" \
"movq (%[ref]),%%xmm4\n\t" \
"movq (%[src],%[src_ystride]),%%xmm1\n\t" \
"lea (%[src],%[src_ystride],2),%[src]\n\t" \
"movq (%[ref],%[ref_ystride]),%%xmm5\n\t" \
"lea (%[ref],%[ref_ystride],2),%[ref]\n\t" \
"movq (%[src]),%%xmm2\n\t" \
"movq (%[ref]),%%xmm7\n\t" \
"movq (%[src],%[src_ystride]),%%xmm3\n\t" \
"movq (%[ref],%[ref_ystride]),%%xmm6\n\t" \
"punpcklbw %%xmm4,%%xmm0\n\t" \
"lea (%[src],%[src_ystride],2),%[src]\n\t" \
"punpcklbw %%xmm4,%%xmm4\n\t" \
"lea (%[ref],%[ref_ystride],2),%[ref]\n\t" \
"psubw %%xmm4,%%xmm0\n\t" \
"movq (%[src]),%%xmm4\n\t" \
"movdqa %%xmm0,"OC_MEM_OFFS(0x00,buf)"\n\t" \
"movq (%[ref]),%%xmm0\n\t" \
"punpcklbw %%xmm5,%%xmm1\n\t" \
"punpcklbw %%xmm5,%%xmm5\n\t" \
"psubw %%xmm5,%%xmm1\n\t" \
"movq (%[src],%[src_ystride]),%%xmm5\n\t" \
"punpcklbw %%xmm7,%%xmm2\n\t" \
"punpcklbw %%xmm7,%%xmm7\n\t" \
"psubw %%xmm7,%%xmm2\n\t" \
"movq (%[ref],%[ref_ystride]),%%xmm7\n\t" \
"punpcklbw %%xmm6,%%xmm3\n\t" \
"lea (%[src],%[src_ystride],2),%[src]\n\t" \
"punpcklbw %%xmm6,%%xmm6\n\t" \
"psubw %%xmm6,%%xmm3\n\t" \
"movq (%[src]),%%xmm6\n\t" \
"punpcklbw %%xmm0,%%xmm4\n\t" \
"lea (%[ref],%[ref_ystride],2),%[ref]\n\t" \
"punpcklbw %%xmm0,%%xmm0\n\t" \
"lea (%[src],%[src_ystride],2),%[src]\n\t" \
"psubw %%xmm0,%%xmm4\n\t" \
"movq (%[ref]),%%xmm0\n\t" \
"punpcklbw %%xmm7,%%xmm5\n\t" \
"neg %[src_ystride]\n\t" \
"punpcklbw %%xmm7,%%xmm7\n\t" \
"psubw %%xmm7,%%xmm5\n\t" \
"movq (%[src],%[src_ystride]),%%xmm7\n\t" \
"punpcklbw %%xmm0,%%xmm6\n\t" \
"lea (%[ref],%[ref_ystride],2),%[ref]\n\t" \
"punpcklbw %%xmm0,%%xmm0\n\t" \
"neg %[ref_ystride]\n\t" \
"psubw %%xmm0,%%xmm6\n\t" \
"movq (%[ref],%[ref_ystride]),%%xmm0\n\t" \
"punpcklbw %%xmm0,%%xmm7\n\t" \
"punpcklbw %%xmm0,%%xmm0\n\t" \
"psubw %%xmm0,%%xmm7\n\t" \
"movdqa "OC_MEM_OFFS(0x00,buf)",%%xmm0\n\t" \
/*Load an 8x8 array of pixel values from %[src] into %%xmm0...%%xmm7.*/
#define OC_LOAD_8x8 \
"#OC_LOAD_8x8\n\t" \
"movq (%[src]),%%xmm0\n\t" \
"movq (%[src],%[ystride]),%%xmm1\n\t" \
"movq (%[src],%[ystride],2),%%xmm2\n\t" \
"pxor %%xmm7,%%xmm7\n\t" \
"movq (%[src],%[ystride3]),%%xmm3\n\t" \
"punpcklbw %%xmm7,%%xmm0\n\t" \
"movq (%[src4]),%%xmm4\n\t" \
"punpcklbw %%xmm7,%%xmm1\n\t" \
"movq (%[src4],%[ystride]),%%xmm5\n\t" \
"punpcklbw %%xmm7,%%xmm2\n\t" \
"movq (%[src4],%[ystride],2),%%xmm6\n\t" \
"punpcklbw %%xmm7,%%xmm3\n\t" \
"movq (%[src4],%[ystride3]),%%xmm7\n\t" \
"punpcklbw %%xmm4,%%xmm4\n\t" \
"punpcklbw %%xmm5,%%xmm5\n\t" \
"psrlw $8,%%xmm4\n\t" \
"psrlw $8,%%xmm5\n\t" \
"punpcklbw %%xmm6,%%xmm6\n\t" \
"punpcklbw %%xmm7,%%xmm7\n\t" \
"psrlw $8,%%xmm6\n\t" \
"psrlw $8,%%xmm7\n\t" \
/*Performs the first two stages of an 8-point 1-D Hadamard transform in place.
Outputs 1, 3, 4, and 5 from the second stage are negated (which allows us to
perform this stage in place with no temporary registers).*/
#define OC_HADAMARD_AB_8x8 \
"#OC_HADAMARD_AB_8x8\n\t" \
/*Stage A:*/ \
"paddw %%xmm5,%%xmm1\n\t" \
"paddw %%xmm6,%%xmm2\n\t" \
"paddw %%xmm5,%%xmm5\n\t" \
"paddw %%xmm6,%%xmm6\n\t" \
"psubw %%xmm1,%%xmm5\n\t" \
"psubw %%xmm2,%%xmm6\n\t" \
"paddw %%xmm7,%%xmm3\n\t" \
"paddw %%xmm4,%%xmm0\n\t" \
"paddw %%xmm7,%%xmm7\n\t" \
"paddw %%xmm4,%%xmm4\n\t" \
"psubw %%xmm3,%%xmm7\n\t" \
"psubw %%xmm0,%%xmm4\n\t" \
/*Stage B:*/ \
"paddw %%xmm2,%%xmm0\n\t" \
"paddw %%xmm3,%%xmm1\n\t" \
"paddw %%xmm6,%%xmm4\n\t" \
"paddw %%xmm7,%%xmm5\n\t" \
"paddw %%xmm2,%%xmm2\n\t" \
"paddw %%xmm3,%%xmm3\n\t" \
"paddw %%xmm6,%%xmm6\n\t" \
"paddw %%xmm7,%%xmm7\n\t" \
"psubw %%xmm0,%%xmm2\n\t" \
"psubw %%xmm1,%%xmm3\n\t" \
"psubw %%xmm4,%%xmm6\n\t" \
"psubw %%xmm5,%%xmm7\n\t" \
/*Performs the last stage of an 8-point 1-D Hadamard transform in place.
Outputs 1, 3, 5, and 7 are negated (which allows us to perform this stage in
place with no temporary registers).*/
#define OC_HADAMARD_C_8x8 \
"#OC_HADAMARD_C_8x8\n\t" \
/*Stage C:*/ \
"paddw %%xmm1,%%xmm0\n\t" \
"paddw %%xmm3,%%xmm2\n\t" \
"paddw %%xmm5,%%xmm4\n\t" \
"paddw %%xmm7,%%xmm6\n\t" \
"paddw %%xmm1,%%xmm1\n\t" \
"paddw %%xmm3,%%xmm3\n\t" \
"paddw %%xmm5,%%xmm5\n\t" \
"paddw %%xmm7,%%xmm7\n\t" \
"psubw %%xmm0,%%xmm1\n\t" \
"psubw %%xmm2,%%xmm3\n\t" \
"psubw %%xmm4,%%xmm5\n\t" \
"psubw %%xmm6,%%xmm7\n\t" \
/*Performs an 8-point 1-D Hadamard transform in place.
Outputs 1, 2, 4, and 7 are negated (which allows us to perform the transform
in place with no temporary registers).*/
#define OC_HADAMARD_8x8 \
OC_HADAMARD_AB_8x8 \
OC_HADAMARD_C_8x8 \
/*Performs the first part of the final stage of the Hadamard transform and
summing of absolute values.
At the end of this part, %%xmm1 will contain the DC coefficient of the
transform.*/
#define OC_HADAMARD_C_ABS_ACCUM_A_8x8 \
/*We use the fact that \
(abs(a+b)+abs(a-b))/2=max(abs(a),abs(b)) \
to merge the final butterfly with the abs and the first stage of \
accumulation. \
Thus we can avoid using pabsw, which is not available until SSSE3. \
Emulating pabsw takes 3 instructions, so the straightforward SSE2 \
implementation would be (3+3)*8+7=55 instructions (+4 for spilling \
registers). \
Even with pabsw, it would be (3+1)*8+7=39 instructions (with no spills). \
This implementation is only 26 (+4 for spilling registers).*/ \
"#OC_HADAMARD_C_ABS_ACCUM_A_8x8\n\t" \
"movdqa %%xmm7,"OC_MEM_OFFS(0x10,buf)"\n\t" \
"movdqa %%xmm6,"OC_MEM_OFFS(0x00,buf)"\n\t" \
/*xmm7={0x7FFF}x4 \
xmm4=max(abs(xmm4),abs(xmm5))-0x7FFF*/ \
"pcmpeqb %%xmm7,%%xmm7\n\t" \
"movdqa %%xmm4,%%xmm6\n\t" \
"psrlw $1,%%xmm7\n\t" \
"paddw %%xmm5,%%xmm6\n\t" \
"pmaxsw %%xmm5,%%xmm4\n\t" \
"paddsw %%xmm7,%%xmm6\n\t" \
"psubw %%xmm6,%%xmm4\n\t" \
/*xmm2=max(abs(xmm2),abs(xmm3))-0x7FFF \
xmm0=max(abs(xmm0),abs(xmm1))-0x7FFF*/ \
"movdqa %%xmm2,%%xmm6\n\t" \
"movdqa %%xmm0,%%xmm5\n\t" \
"pmaxsw %%xmm3,%%xmm2\n\t" \
"pmaxsw %%xmm1,%%xmm0\n\t" \
"paddw %%xmm3,%%xmm6\n\t" \
"movdqa "OC_MEM_OFFS(0x10,buf)",%%xmm3\n\t" \
"paddw %%xmm5,%%xmm1\n\t" \
"movdqa "OC_MEM_OFFS(0x00,buf)",%%xmm5\n\t" \
/*Performs the second part of the final stage of the Hadamard transform and
summing of absolute values.*/
#define OC_HADAMARD_C_ABS_ACCUM_B_8x8 \
"#OC_HADAMARD_C_ABS_ACCUM_B_8x8\n\t" \
"paddsw %%xmm7,%%xmm6\n\t" \
"paddsw %%xmm7,%%xmm1\n\t" \
"psubw %%xmm6,%%xmm2\n\t" \
"psubw %%xmm1,%%xmm0\n\t" \
/*xmm7={1}x4 (needed for the horizontal add that follows) \
xmm0+=xmm2+xmm4+max(abs(xmm3),abs(xmm5))-0x7FFF*/ \
"movdqa %%xmm3,%%xmm6\n\t" \
"pmaxsw %%xmm5,%%xmm3\n\t" \
"paddw %%xmm2,%%xmm0\n\t" \
"paddw %%xmm5,%%xmm6\n\t" \
"paddw %%xmm4,%%xmm0\n\t" \
"paddsw %%xmm7,%%xmm6\n\t" \
"paddw %%xmm3,%%xmm0\n\t" \
"psrlw $14,%%xmm7\n\t" \
"psubw %%xmm6,%%xmm0\n\t" \
/*Performs the last stage of an 8-point 1-D Hadamard transform, takes the
absolute value of each component, and accumulates everything into xmm0.*/
#define OC_HADAMARD_C_ABS_ACCUM_8x8 \
OC_HADAMARD_C_ABS_ACCUM_A_8x8 \
OC_HADAMARD_C_ABS_ACCUM_B_8x8 \
/*Performs an 8-point 1-D Hadamard transform, takes the absolute value of each
component, and accumulates everything into xmm0.
Note that xmm0 will have an extra 4 added to each column, and that after
removing this value, the remainder will be half the conventional value.*/
#define OC_HADAMARD_ABS_ACCUM_8x8 \
OC_HADAMARD_AB_8x8 \
OC_HADAMARD_C_ABS_ACCUM_8x8
static unsigned oc_int_frag_satd_sse2(int *_dc,
const unsigned char *_src,int _src_ystride,
const unsigned char *_ref,int _ref_ystride){
OC_ALIGN16(ogg_int16_t buf[16]);
unsigned ret;
unsigned ret2;
int dc;
__asm__ __volatile__(
OC_LOAD_SUB_8x8
OC_HADAMARD_8x8
OC_TRANSPOSE_8x8
/*We split out the stages here so we can save the DC coefficient in the
middle.*/
OC_HADAMARD_AB_8x8
OC_HADAMARD_C_ABS_ACCUM_A_8x8
"movd %%xmm1,%[dc]\n\t"
OC_HADAMARD_C_ABS_ACCUM_B_8x8
/*Up to this point, everything fit in 16 bits (8 input + 1 for the
difference + 2*3 for the two 8-point 1-D Hadamards - 1 for the abs - 1
for the factor of two we dropped + 3 for the vertical accumulation).
Now we finally have to promote things to dwords.
We break this part out of OC_HADAMARD_ABS_ACCUM_8x8 to hide the long
latency of pmaddwd by starting to compute abs(dc) here.*/
"pmaddwd %%xmm7,%%xmm0\n\t"
"movsx %w[dc],%[dc]\n\t"
"cdq\n\t"
"movdqa %%xmm0,%%xmm1\n\t"
"punpckhqdq %%xmm0,%%xmm0\n\t"
"paddd %%xmm1,%%xmm0\n\t"
"pshuflw $0xE,%%xmm0,%%xmm1\n\t"
"paddd %%xmm1,%%xmm0\n\t"
"movd %%xmm0,%[ret]\n\t"
/*The sums produced by OC_HADAMARD_ABS_ACCUM_8x8 each have an extra 4
added to them, a factor of two removed, and the DC value included;
correct the final sum here.*/
"lea -64(%[ret2],%[ret],2),%[ret]\n\t"
"xor %[dc],%[ret2]\n\t"
"sub %[ret2],%[ret]\n\t"
/*Although it looks like we're using 7 registers here, gcc can alias %[ret]
and %[dc] with some of the inputs, since for once we don't write to
them until after we're done using everything but %[buf].*/
/*Note that _src_ystride and _ref_ystride must be given non-overlapping
constraints, otherewise if gcc can prove they're equal it will allocate
them to the same register (which is bad); _src and _ref face a similar
problem.
All four are destructively modified, but if we list them as output
constraints, gcc can't alias them with other outputs.*/
:[ret]"=r"(ret),[ret2]"=d"(ret2),[dc]"=a"(dc),
[buf]"=m"(OC_ARRAY_OPERAND(ogg_int16_t,buf,16))
:[src]"S"(_src),[src_ystride]"c"((ptrdiff_t)_src_ystride),
[ref]"a"(_ref),[ref_ystride]"d"((ptrdiff_t)_ref_ystride)
/*We have to use neg, so we actually clobber the condition codes for once
(not to mention sub, and add).*/
:"cc"
);
*_dc=dc;
return ret;
}
unsigned oc_enc_frag_satd_sse2(int *_dc,const unsigned char *_src,
const unsigned char *_ref,int _ystride){
return oc_int_frag_satd_sse2(_dc,_src,_ystride,_ref,_ystride);
}
unsigned oc_enc_frag_satd2_sse2(int *_dc,const unsigned char *_src,
const unsigned char *_ref1,const unsigned char *_ref2,int _ystride){
OC_ALIGN8(unsigned char ref[64]);
oc_int_frag_copy2_mmxext(ref,8,_ref1,_ref2,_ystride);
return oc_int_frag_satd_sse2(_dc,_src,_ystride,ref,8);
}
unsigned oc_enc_frag_intra_satd_sse2(int *_dc,
const unsigned char *_src,int _ystride){
OC_ALIGN16(ogg_int16_t buf[16]);
unsigned ret;
int dc;
__asm__ __volatile__(
OC_LOAD_8x8
OC_HADAMARD_8x8
OC_TRANSPOSE_8x8
/*We split out the stages here so we can save the DC coefficient in the
middle.*/
OC_HADAMARD_AB_8x8
OC_HADAMARD_C_ABS_ACCUM_A_8x8
"movd %%xmm1,%[dc]\n\t"
OC_HADAMARD_C_ABS_ACCUM_B_8x8
/*Up to this point, everything fit in 16 bits (8 input + 1 for the
difference + 2*3 for the two 8-point 1-D Hadamards - 1 for the abs - 1
for the factor of two we dropped + 3 for the vertical accumulation).
Now we finally have to promote things to dwords.*/
"pmaddwd %%xmm7,%%xmm0\n\t"
/*We assume that the DC coefficient is always positive (which is true,
because the input to the INTRA transform was not a difference).*/
"movzx %w[dc],%[dc]\n\t"
"movdqa %%xmm0,%%xmm1\n\t"
"punpckhqdq %%xmm0,%%xmm0\n\t"
"paddd %%xmm1,%%xmm0\n\t"
"pshuflw $0xE,%%xmm0,%%xmm1\n\t"
"paddd %%xmm1,%%xmm0\n\t"
"movd %%xmm0,%[ret]\n\t"
"lea -64(%[ret],%[ret]),%[ret]\n\t"
"sub %[dc],%[ret]\n\t"
/*Although it looks like we're using 7 registers here, gcc can alias %[ret]
and %[dc] with some of the inputs, since for once we don't write to
them until after we're done using everything but %[buf].*/
:[ret]"=a"(ret),[dc]"=r"(dc),
[buf]"=m"(OC_ARRAY_OPERAND(ogg_int16_t,buf,16))
:[src]"r"(_src),[src4]"r"(_src+4*_ystride),
[ystride]"r"((ptrdiff_t)_ystride),[ystride3]"r"((ptrdiff_t)3*_ystride)
/*We have to use sub, so we actually clobber the condition codes for once.*/
:"cc"
);
*_dc=dc;
return ret;
}
#endif
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