diff options
Diffstat (limited to 'plugins/wma/libwma/fft-ffmpeg_arm.h')
| -rw-r--r-- | plugins/wma/libwma/fft-ffmpeg_arm.h | 456 |
1 files changed, 456 insertions, 0 deletions
diff --git a/plugins/wma/libwma/fft-ffmpeg_arm.h b/plugins/wma/libwma/fft-ffmpeg_arm.h new file mode 100644 index 00000000..073ad8ee --- /dev/null +++ b/plugins/wma/libwma/fft-ffmpeg_arm.h @@ -0,0 +1,456 @@ +/*************************************************************************** + * __________ __ ___. + * 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 |