Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
rockbox/apps/codecs/lib/fft-ffmpeg_arm.h

456 lines
18 KiB
C
Raw Blame History

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2010 Dave Hooper
*
* ARM optimisations for ffmpeg's fft (used in fft-ffmpeg.c)
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifdef CPU_ARM
/* Start off with optimised variants of the butterflies that work
nicely on arm */
/* 1. where y and a share the same variable/register */
#define BF_OPT(x,y,a,b) {\
y = a + b;\
x = y - (b<<1);\
}
/* 2. where y and b share the same variable/register */
#define BF_OPT2(x,y,a,b) {\
x = a - b;\
y = x + (b<<1);\
}
/* 3. where y and b share the same variable/register (but y=(-b)) */
#define BF_OPT2_REV(x,y,a,b) {\
x = a + b;\
y = x - (b<<1);\
}
/* standard BUTTERFLIES package. Note, we actually manually inline this
in all the TRANSFORM macros below anyway */
#define FFT_FFMPEG_INCL_OPTIMISED_BUTTERFLIES
#define BUTTERFLIES(a0,a1,a2,a3) {\
{\
BF_OPT(t1, t5, t5, t1);\
BF_OPT(t6, t2, t2, t6);\
BF_OPT(a2.re, a0.re, a0.re, t5);\
BF_OPT(a2.im, a0.im, a0.im, t2);\
BF_OPT(a3.re, a1.re, a1.re, t6);\
BF_OPT(a3.im, a1.im, a1.im, t1);\
}\
}
#define FFT_FFMPEG_INCL_OPTIMISED_TRANSFORM
static inline FFTComplex* TRANSFORM( FFTComplex* z, int n, FFTSample wre, FFTSample wim )
{
register FFTSample t1,t2 asm("r5"),t5 asm("r6"),t6 asm("r7"),r_re asm("r8"),r_im asm("r9");
z += n*2; /* z[o2] */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
XPROD31_R(r_re, r_im, wre, wim, t1,t2);
z += n; /* z[o3] */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
XNPROD31_R(r_re, r_im, wre, wim, t5,t6);
BF_OPT(t1, t5, t5, t1);
BF_OPT(t6, t2, t2, t6);
{
register FFTSample rt0temp asm("r4");
/*{*/
/* BF_OPT(t1, t5, t5, t1);*/
/* BF_OPT(t6, t2, t2, t6);*/
/* BF_OPT(a2.re, a0.re, a0.re, t5);*/
/* BF_OPT(a2.im, a0.im, a0.im, t2);*/
/* BF_OPT(a3.re, a1.re, a1.re, t6);*/
/* BF_OPT(a3.im, a1.im, a1.im, t1);*/
/*}*/
z -= n*3;
/* r_re = my_z[0]; r_im = my_z[1]; */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
BF_OPT(rt0temp, r_re, r_re, t5);
BF_OPT(t2, r_im, r_im, t2);
/* my_z[0] = r_re; my_z[1] = r_im; */
asm volatile( "stmia %[my_z], {%[r_re],%[r_im]}\n\t"::[my_z] "r" (z), [r_re] "r" (r_re), [r_im] "r" (r_im):"memory" );
z += n;
/* r_re = my_z[0]; r_im = my_z[1]; */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
BF_OPT(t5, r_re, r_re, t6);
BF_OPT(t6, r_im, r_im, t1);
/* my_z[0] = r_re; my_z[1] = r_im; */
asm volatile( "stmia %[my_z], {%[r_re],%[r_im]}\n\t"::[my_z] "r" (z), [r_re] "r" (r_re), [r_im] "r" (r_im):"memory");
z += n;
/* my_z[0] = rt0temp; my_z[1] = t2; */
asm volatile( "stmia %[my_z], {%[rt0temp],%[t2]}\n\t"::[my_z] "r" (z), [rt0temp] "r" (rt0temp), [t2] "r" (t2):"memory");
}
z += n;
/* my_z[0] = t5; my_z[1] = t6; */
asm volatile( "stmia %[my_z]!, {%[t5],%[t6]}\n\t":[my_z] "+r" (z) : [t5] "r" (t5), [t6] "r" (t6):"memory");
z -= n*3;
return(z);
}
static inline FFTComplex* TRANSFORM_W01( FFTComplex* z, int n, const FFTSample* w )
{
register FFTSample t1,t2 asm("r5"),t5 asm("r6"),t6 asm("r7"),r_re asm("r8"),r_im asm("r9");
/* load wre,wim into t5,t6 */
asm volatile( "ldmia %[w], {%[wre], %[wim]}\n\t":[wre] "=r" (t5), [wim] "=r" (t6):[w] "r" (w));
z += n*2; /* z[o2] -- 2n * 2 since complex numbers */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
XPROD31_R(r_re, r_im, t5 /*wre*/, t6 /*wim*/, t1,t2);
z += n; /* z[o3] */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
XNPROD31_R(r_re, r_im, t5 /*wre*/, t6 /*wim*/, t5,t6);
BF_OPT(t1, t5, t5, t1);
BF_OPT(t6, t2, t2, t6);
{
register FFTSample rt0temp asm("r4");
/*{*/
/* BF_OPT(t1, t5, t5, t1);*/
/* BF_OPT(t6, t2, t2, t6);*/
/* BF_OPT(a2.re, a0.re, a0.re, t5);*/
/* BF_OPT(a2.im, a0.im, a0.im, t2);*/
/* BF_OPT(a3.re, a1.re, a1.re, t6);*/
/* BF_OPT(a3.im, a1.im, a1.im, t1);*/
/*}*/
z -= n*3;
/* r_re = my_z[0]; r_im = my_z[1]; */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
BF_OPT(rt0temp, r_re, r_re, t5);
BF_OPT(t2, r_im, r_im, t2);
/* my_z[0] = r_re; my_z[1] = r_im; */
asm volatile( "stmia %[my_z], {%[r_re],%[r_im]}\n\t"::[my_z] "r" (z), [r_re] "r" (r_re), [r_im] "r" (r_im):"memory");
z += n;
/* r_re = my_z[0]; r_im = my_z[1]; */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
BF_OPT(t5, r_re, r_re, t6);
BF_OPT(t6, r_im, r_im, t1);
/* my_z[0] = r_re; my_z[1] = r_im; */
asm volatile( "stmia %[my_z], {%[r_re],%[r_im]}\n\t"::[my_z] "r" (z), [r_re] "r" (r_re), [r_im] "r" (r_im):"memory");
z += n;
/* my_z[0] = rt0temp; my_z[1] = t2; */
asm volatile( "stmia %[my_z], {%[rt0temp],%[t2]}\n\t"::[my_z] "r" (z), [rt0temp] "r" (rt0temp), [t2] "r" (t2):"memory");
}
z += n;
/* my_z[0] = t5; my_z[1] = t6; */
asm volatile( "stmia %[my_z]!, {%[t5],%[t6]}\n\t":[my_z] "+r" (z) : [t5] "r" (t5), [t6] "r" (t6):"memory");
z -= n*3;
return(z);
}
static inline FFTComplex* TRANSFORM_W10( FFTComplex* z, int n, const FFTSample* w )
{
register FFTSample t1,t2 asm("r5"),t5 asm("r6"),t6 asm("r7"),r_re asm("r8"),r_im asm("r9");
/* load wim,wre into t5,t6 */
asm volatile( "ldmia %[w], {%[wim], %[wre]}\n\t":[wim] "=r" (t5), [wre] "=r" (t6):[w] "r" (w));
z += n*2; /* z[o2] -- 2n * 2 since complex numbers */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
XPROD31_R(r_re, r_im, t6 /*wim*/, t5 /*wre*/, t1,t2);
z += n; /* z[o3] */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
XNPROD31_R(r_re, r_im, t6 /*wim*/, t5 /*wre*/, t5,t6);
BF_OPT(t1, t5, t5, t1);
BF_OPT(t6, t2, t2, t6);
{
register FFTSample rt0temp asm("r4");
/*{*/
/* BF_OPT(t1, t5, t5, t1);*/
/* BF_OPT(t6, t2, t2, t6);*/
/* BF_OPT(a2.re, a0.re, a0.re, t5);*/
/* BF_OPT(a2.im, a0.im, a0.im, t2);*/
/* BF_OPT(a3.re, a1.re, a1.re, t6);*/
/* BF_OPT(a3.im, a1.im, a1.im, t1);*/
/*}*/
z -= n*3;
/* r_re = my_z[0]; r_im = my_z[1]; */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
BF_OPT(rt0temp, r_re, r_re, t5);
BF_OPT(t2, r_im, r_im, t2);
/* my_z[0] = r_re; my_z[1] = r_im; */
asm volatile( "stmia %[my_z], {%[r_re],%[r_im]}\n\t"::[my_z] "r" (z), [r_re] "r" (r_re), [r_im] "r" (r_im):"memory");
z += n;
/* r_re = my_z[0]; r_im = my_z[1]; */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
BF_OPT(t5, r_re, r_re, t6);
BF_OPT(t6, r_im, r_im, t1);
/* my_z[0] = r_re; my_z[1] = r_im; */
asm volatile( "stmia %[my_z], {%[r_re],%[r_im]}\n\t"::[my_z] "r" (z), [r_re] "r" (r_re), [r_im] "r" (r_im):"memory");
z += n;
/* my_z[0] = rt0temp; my_z[1] = t2; */
asm volatile( "stmia %[my_z], {%[rt0temp],%[t2]}\n\t"::[my_z] "r" (z), [rt0temp] "r" (rt0temp), [t2] "r" (t2):"memory");
}
z += n;
/* my_z[0] = t5; my_z[1] = t6; */
asm volatile( "stmia %[my_z]!, {%[t5],%[t6]}\n\t":[my_z] "+r" (z) : [t5] "r" (t5), [t6] "r" (t6):"memory");
z -= n*3;
return(z);
}
static inline FFTComplex* TRANSFORM_EQUAL( FFTComplex* z, int n )
{
register FFTSample t1,t2 asm("r5"),t5 asm("r6"),t6 asm("r7"),r_re asm("r8"),r_im asm("r9");
z += n*2; /* z[o2] -- 2n * 2 since complex numbers */
asm volatile( "ldmia %[my_z], {%[t5],%[t6]}\n\t":[t5] "=r" (t5), [t6] "=r" (t6):[my_z] "r" (z));
z += n; /* z[o3] */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
/**/
/*t2 = MULT32(cPI2_8, t5);*/
/*t1 = MULT31(cPI2_8, t6);*/
/*t6 = MULT31(cPI2_8, r_re);*/
/*t5 = MULT32(cPI2_8, r_im);*/
/*t1 = ( t1 + (t2<<1) );*/
/*t2 = ( t1 - (t2<<2) );*/
/*t6 = ( t6 + (t5<<1) );*/
/*t5 = ( t6 - (t5<<2) );*/
/**/
t2 = MULT31(cPI2_8, t5);
t6 = MULT31(cPI2_8, t6);
r_re = MULT31(cPI2_8, r_re);
t5 = MULT31(cPI2_8, r_im);
t1 = ( t6 + t2 );
t2 = ( t6 - t2 );
t6 = ( r_re + t5 );
t5 = ( r_re - t5 );
BF_OPT(t1, t5, t5, t1);
BF_OPT(t6, t2, t2, t6);
{
register FFTSample rt0temp asm("r4");
/*{*/
/* BF_OPT(t1, t5, t5, t1);*/
/* BF_OPT(t6, t2, t2, t6);*/
/* BF_OPT(a2.re, a0.re, a0.re, t5);*/
/* BF_OPT(a2.im, a0.im, a0.im, t2);*/
/* BF_OPT(a3.re, a1.re, a1.re, t6);*/
/* BF_OPT(a3.im, a1.im, a1.im, t1);*/
/*}*/
z -= n*3;
/* r_re = my_z[0]; r_im = my_z[1]; */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
BF_OPT(rt0temp, r_re, r_re, t5);
BF_OPT(t2, r_im, r_im, t2);
/* my_z[0] = r_re; my_z[1] = r_im; */
asm volatile( "stmia %[my_z], {%[r_re],%[r_im]}\n\t"::[my_z] "r" (z), [r_re] "r" (r_re), [r_im] "r" (r_im):"memory");
z += n;
/* r_re = my_z[0]; r_im = my_z[1]; */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
BF_OPT(t5, r_re, r_re, t6);
BF_OPT(t6, r_im, r_im, t1);
/* my_z[0] = r_re; my_z[1] = r_im; */
asm volatile( "stmia %[my_z], {%[r_re],%[r_im]}\n\t"::[my_z] "r" (z), [r_re] "r" (r_re), [r_im] "r" (r_im):"memory");
z += n;
/* my_z[0] = rt0temp; my_z[1] = t2; */
asm volatile( "stmia %[my_z], {%[rt0temp],%[t2]}\n\t"::[my_z] "r" (z), [rt0temp] "r" (rt0temp), [t2] "r" (t2):"memory");
}
z += n;
/* my_z[0] = t5; my_z[1] = t6; */
asm volatile( "stmia %[my_z]!, {%[t5],%[t6]}\n\t":[my_z] "+r" (z) : [t5] "r" (t5), [t6] "r" (t6):"memory");
z -= n*3;
return(z);
}
static inline FFTComplex* TRANSFORM_ZERO( FFTComplex* z, int n )
{
register FFTSample t1,t2 asm("r5"),t5 asm("r6"),t6 asm("r7"), r_re asm("r8"), r_im asm("r9");
z += n*2; /* z[o2] -- 2n * 2 since complex numbers */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
z += n; /* z[o3] */
asm volatile( "ldmia %[my_z], {%[t5],%[t6]}\n\t":[t5] "=r" (t5), [t6] "=r" (t6):[my_z] "r" (z));
BF_OPT(t1, t5, t5, r_re);
BF_OPT(t6, t2, r_im, t6);
{
register FFTSample rt0temp asm("r4");
/*{*/
/* BF_OPT(t1, t5, t5, t1);*/
/* BF_OPT(t6, t2, t2, t6);*/
/* BF_OPT(a2.re, a0.re, a0.re, t5);*/
/* BF_OPT(a2.im, a0.im, a0.im, t2);*/
/* BF_OPT(a3.re, a1.re, a1.re, t6);*/
/* BF_OPT(a3.im, a1.im, a1.im, t1);*/
/*}*/
z -= n*3;
/* r_re = my_z[0]; r_im = my_z[1]; */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
BF_OPT(rt0temp, r_re, r_re, t5);
BF_OPT(t2, r_im, r_im, t2);
/* my_z[0] = r_re; my_z[1] = r_im; */
asm volatile( "stmia %[my_z], {%[r_re],%[r_im]}\n\t"::[my_z] "r" (z), [r_re] "r" (r_re), [r_im] "r" (r_im):"memory");
z += n;
/* r_re = my_z[0]; r_im = my_z[1]; */
asm volatile( "ldmia %[my_z], {%[r_re],%[r_im]}\n\t":[r_re] "=r" (r_re), [r_im] "=r" (r_im):[my_z] "r" (z));
BF_OPT(t5, r_re, r_re, t6);
BF_OPT(t6, r_im, r_im, t1);
/* my_z[0] = r_re; my_z[1] = r_im; */
asm volatile( "stmia %[my_z], {%[r_re],%[r_im]}\n\t"::[my_z] "r" (z), [r_re] "r" (r_re), [r_im] "r" (r_im):"memory");
z += n;
/* my_z[0] = rt0temp; my_z[1] = t2; */
asm volatile( "stmia %[my_z], {%[rt0temp],%[t2]}\n\t"::[my_z] "r" (z), [rt0temp] "r" (rt0temp), [t2] "r" (t2):"memory");
}
z += n;
/* my_z[0] = t5; my_z[1] = t6; */
asm volatile( "stmia %[my_z]!, {%[t5],%[t6]}\n\t":[my_z] "+r" (z) : [t5] "r" (t5), [t6] "r" (t6):"memory");
z -= n*3;
return(z);
}
#define FFT_FFMPEG_INCL_OPTIMISED_FFT4
static inline FFTComplex* fft4(FFTComplex * z)
{
FFTSample temp;
/* input[0..7] -> output[0..7] */
/* load r1=z[0],r2=z[1],...,r8=z[7] */
asm volatile(
"ldmia %[z], {r1-r8}\n\t"
"add r1,r1,r3\n\t" /* r1 :=t1 */
"sub r3,r1,r3, lsl #1\n\t" /* r3 :=t3 */
"sub r7,r7,r5\n\t" /* r10:=t8 */
"add r5,r7,r5, lsl #1\n\t" /* r5 :=t6 */
"add r1,r1,r5\n\t" /* r1 = o[0] */
"sub r5,r1,r5, lsl #1\n\t" /* r5 = o[4] */
"add r2,r2,r4\n\t" /* r2 :=t2 */
"sub r4,r2,r4, lsl #1\n\t" /* r9 :=t4 */
"add %[temp],r6,r8\n\t" /* r10:=t5 */
"sub r6,r6,r8\n\t" /* r6 :=t7 */
"sub r8,r4,r7\n\t" /* r8 = o[7]*/
"add r4,r4,r7\n\t" /* r4 = o[3]*/
"sub r7,r3,r6\n\t" /* r7 = o[6]*/
"add r3,r3,r6\n\t" /* r3 = o[2]*/
"sub r6,r2,%[temp]\n\t" /* r6 = o[5]*/
"add r2,r2,%[temp]\n\t" /* r2 = o[1]*/
"stmia %[z]!, {r1-r8}\n\t"
: /* outputs */ [z] "+r" (z), [temp] "=r" (temp)
: /* inputs */
: /* clobbers */
"r1","r2","r3","r4","r5","r6","r7","r8","memory"
);
return z;
}
#define FFT_FFMPEG_INCL_OPTIMISED_FFT8
/* The chunk of asm below is equivalent to the following:
// first load in z[4].re thru z[7].im into local registers
// ...
BF_OPT2_REV(z[4].re, z[5].re, z[4].re, z[5].re); // x=a+b; y=x-(b<<1)
BF_OPT2_REV(z[4].im, z[5].im, z[4].im, z[5].im);
BF_REV (temp, z[7].re, z[6].re, z[7].re); // x=a+b; y=a-b;
BF_REV (z[6].re, z[7].im, z[6].im, z[7].im);
// save z[7].re and z[7].im as those are complete now
// z[5].re and z[5].im are also complete now but save these later on
BF(z[6].im, z[4].re, temp, z[4].re); // x=a-b; y=a+b
BF_OPT(z[6].re, z[4].im, z[4].im, z[6].re); // y=a+b; x=y-(b<<1)
// now load z[2].re and z[2].im
// ...
BF_OPT(z[6].re, z[2].re, z[2].re, z[6].re); // y=a+b; x=y-(b<<1)
BF_OPT(z[6].im, z[2].im, z[2].im, z[6].im); // y=a+b; x=y-(b<<1)
// Now save z[6].re and z[6].im, along with z[5].re and z[5].im
// for efficiency. Also save z[2].re and z[2].im.
// Now load z[0].re and z[0].im
// ...
BF_OPT(z[4].re, z[0].re, z[0].re, z[4].re); // y=a+b; x=y-(b<<1)
BF_OPT(z[4].im, z[0].im, z[0].im, z[4].im); // y=a+b; x=y-(b<<1)
// Finally save out z[4].re, z[4].im, z[0].re and z[0].im
// ...
*/
static inline void fft8(FFTComplex * z)
{
FFTComplex* m4 = fft4(z);
{
/* note that we increment z_ptr on the final stmia, which
leaves z_ptr pointing to z[1].re ready for the Transform step */
register FFTSample temp;
asm volatile(
/* read in z[4].re thru z[7].im */
"ldmia %[z4_ptr]!, {r1-r8}\n\t"
/* (now points one word past &z[7].im) */
"add r1,r1,r3\n\t"
"sub r3,r1,r3,lsl #1\n\t"
"add r2,r2,r4\n\t"
"sub r4,r2,r4,lsl #1\n\t"
"add %[temp],r5,r7\n\t"
"sub r7,r5,r7\n\t"
"add r5,r6,r8\n\t"
"sub r8,r6,r8\n\t"
"stmdb %[z4_ptr]!, {r7,r8}\n\t" /* write z[7].re,z[7].im straight away */
/* Note, registers r7 & r8 now free */
"sub r6,%[temp],r1\n\t"
"add r1,%[temp],r1\n\t"
"add r2,r2,r5\n\t"
"sub r5,r2,r5,lsl #1\n\t"
"add %[temp], %[z_ptr], #16\n\t" /* point to &z[2].re */
"ldmia %[temp],{r7,r8}\n\t" /* load z[2].re and z[2].im */
"add r7,r7,r5\n\t"
"sub r5,r7,r5,lsl #1\n\t"
"add r8,r8,r6\n\t"
"sub r6,r8,r6,lsl #1\n\t"
/* write out z[5].re, z[5].im, z[6].re, z[6].im in one go*/
"stmdb %[z4_ptr]!, {r3-r6}\n\t"
"stmia %[temp],{r7,r8}\n\t" /* write out z[2].re, z[2].im */
"ldmia %[z_ptr],{r7,r8}\n\t" /* load r[0].re, r[0].im */
"add r7,r7,r1\n\t"
"sub r1,r7,r1,lsl #1\n\t"
"add r8,r8,r2\n\t"
"sub r2,r8,r2,lsl #1\n\t"
"stmia %[z_ptr]!,{r7,r8}\n\t" /* write out z[0].re, z[0].im */
"stmdb %[z4_ptr], {r1,r2}\n\t" /* write out z[4].re, z[4].im */
: [z4_ptr] "+r" (m4), [temp] "=r" (temp), [z_ptr] "+r" (z)
:
: "r1","r2","r3","r4","r5","r6","r7","r8","memory"
);
}
TRANSFORM_EQUAL(z,2);
}
#endif // CPU_ARM
Reference in a new issue View git blame Copy permalink