| /******************************************************************** |
| * * |
| * THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * |
| * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * |
| * * |
| ******************************************************************** |
| |
| function: arm7 and later wide math functions |
| |
| ********************************************************************/ |
| |
| #ifdef _ARM_ASSEM_ |
| |
| #if !defined(_V_WIDE_MATH) && !defined(_LOW_ACCURACY_) |
| #define _V_WIDE_MATH |
| |
| static inline ogg_int32_t MULT32(ogg_int32_t x, ogg_int32_t y) { |
| int lo,hi; |
| asm volatile("smull\t%0, %1, %2, %3" |
| : "=&r"(lo),"=&r"(hi) |
| : "%r"(x),"r"(y) |
| : "cc"); |
| return(hi); |
| } |
| |
| static inline ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) { |
| return MULT32(x,y)<<1; |
| } |
| |
| static inline ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) { |
| int lo,hi; |
| asm volatile("smull %0, %1, %2, %3\n\t" |
| "movs %0, %0, lsr #15\n\t" |
| "adc %1, %0, %1, lsl #17\n\t" |
| : "=&r"(lo),"=&r"(hi) |
| : "%r"(x),"r"(y) |
| : "cc"); |
| return(hi); |
| } |
| |
| #define MB() asm volatile ("" : : : "memory") |
| |
| static inline void XPROD32(ogg_int32_t a, ogg_int32_t b, |
| ogg_int32_t t, ogg_int32_t v, |
| ogg_int32_t *x, ogg_int32_t *y) |
| { |
| int x1, y1, l; |
| asm( "smull %0, %1, %4, %6\n\t" |
| "smlal %0, %1, %5, %7\n\t" |
| "rsb %3, %4, #0\n\t" |
| "smull %0, %2, %5, %6\n\t" |
| "smlal %0, %2, %3, %7" |
| : "=&r" (l), "=&r" (x1), "=&r" (y1), "=r" (a) |
| : "3" (a), "r" (b), "r" (t), "r" (v) |
| : "cc" ); |
| *x = x1; |
| MB(); |
| *y = y1; |
| } |
| |
| static inline void XPROD31(ogg_int32_t a, ogg_int32_t b, |
| ogg_int32_t t, ogg_int32_t v, |
| ogg_int32_t *x, ogg_int32_t *y) |
| { |
| int x1, y1, l; |
| asm( "smull %0, %1, %4, %6\n\t" |
| "smlal %0, %1, %5, %7\n\t" |
| "rsb %3, %4, #0\n\t" |
| "smull %0, %2, %5, %6\n\t" |
| "smlal %0, %2, %3, %7" |
| : "=&r" (l), "=&r" (x1), "=&r" (y1), "=r" (a) |
| : "3" (a), "r" (b), "r" (t), "r" (v) |
| : "cc" ); |
| *x = x1 << 1; |
| MB(); |
| *y = y1 << 1; |
| } |
| |
| static inline void XNPROD31(ogg_int32_t a, ogg_int32_t b, |
| ogg_int32_t t, ogg_int32_t v, |
| ogg_int32_t *x, ogg_int32_t *y) |
| { |
| int x1, y1, l; |
| asm( "rsb %2, %4, #0\n\t" |
| "smull %0, %1, %3, %5\n\t" |
| "smlal %0, %1, %2, %6\n\t" |
| "smull %0, %2, %4, %5\n\t" |
| "smlal %0, %2, %3, %6" |
| : "=&r" (l), "=&r" (x1), "=&r" (y1) |
| : "r" (a), "r" (b), "r" (t), "r" (v) |
| : "cc" ); |
| *x = x1 << 1; |
| MB(); |
| *y = y1 << 1; |
| } |
| |
| #endif |
| |
| #ifndef _V_CLIP_MATH |
| #define _V_CLIP_MATH |
| |
| static inline ogg_int32_t CLIP_TO_15(ogg_int32_t x) { |
| int tmp; |
| asm volatile("subs %1, %0, #32768\n\t" |
| "movpl %0, #0x7f00\n\t" |
| "orrpl %0, %0, #0xff\n" |
| "adds %1, %0, #32768\n\t" |
| "movmi %0, #0x8000" |
| : "+r"(x),"=r"(tmp) |
| : |
| : "cc"); |
| return(x); |
| } |
| |
| #endif |
| |
| #ifndef _V_LSP_MATH_ASM |
| #define _V_LSP_MATH_ASM |
| |
| static inline void lsp_loop_asm(ogg_uint32_t *qip,ogg_uint32_t *pip, |
| ogg_int32_t *qexpp, |
| ogg_int32_t *ilsp,ogg_int32_t wi, |
| ogg_int32_t m){ |
| |
| ogg_uint32_t qi=*qip,pi=*pip; |
| ogg_int32_t qexp=*qexpp; |
| |
| asm("mov r0,%3;" |
| "mov r1,%5,asr#1;" |
| "add r0,r0,r1,lsl#3;" |
| "1:" |
| |
| "ldmdb r0!,{r1,r3};" |
| "subs r1,r1,%4;" //ilsp[j]-wi |
| "rsbmi r1,r1,#0;" //labs(ilsp[j]-wi) |
| "umull %0,r2,r1,%0;" //qi*=labs(ilsp[j]-wi) |
| |
| "subs r1,r3,%4;" //ilsp[j+1]-wi |
| "rsbmi r1,r1,#0;" //labs(ilsp[j+1]-wi) |
| "umull %1,r3,r1,%1;" //pi*=labs(ilsp[j+1]-wi) |
| |
| "cmn r2,r3;" // shift down 16? |
| "beq 0f;" |
| "add %2,%2,#16;" |
| "mov %0,%0,lsr #16;" |
| "orr %0,%0,r2,lsl #16;" |
| "mov %1,%1,lsr #16;" |
| "orr %1,%1,r3,lsl #16;" |
| "0:" |
| "cmp r0,%3;\n" |
| "bhi 1b;\n" |
| |
| // odd filter assymetry |
| "ands r0,%5,#1;\n" |
| "beq 2f;\n" |
| "add r0,%3,%5,lsl#2;\n" |
| |
| "ldr r1,[r0,#-4];\n" |
| "mov r0,#0x4000;\n" |
| |
| "subs r1,r1,%4;\n" //ilsp[j]-wi |
| "rsbmi r1,r1,#0;\n" //labs(ilsp[j]-wi) |
| "umull %0,r2,r1,%0;\n" //qi*=labs(ilsp[j]-wi) |
| "umull %1,r3,r0,%1;\n" //pi*=labs(ilsp[j+1]-wi) |
| |
| "cmn r2,r3;\n" // shift down 16? |
| "beq 2f;\n" |
| "add %2,%2,#16;\n" |
| "mov %0,%0,lsr #16;\n" |
| "orr %0,%0,r2,lsl #16;\n" |
| "mov %1,%1,lsr #16;\n" |
| "orr %1,%1,r3,lsl #16;\n" |
| |
| //qi=(pi>>shift)*labs(ilsp[j]-wi); |
| //pi=(qi>>shift)*labs(ilsp[j+1]-wi); |
| //qexp+=shift; |
| |
| //} |
| |
| /* normalize to max 16 sig figs */ |
| "2:" |
| "mov r2,#0;" |
| "orr r1,%0,%1;" |
| "tst r1,#0xff000000;" |
| "addne r2,r2,#8;" |
| "movne r1,r1,lsr #8;" |
| "tst r1,#0x00f00000;" |
| "addne r2,r2,#4;" |
| "movne r1,r1,lsr #4;" |
| "tst r1,#0x000c0000;" |
| "addne r2,r2,#2;" |
| "movne r1,r1,lsr #2;" |
| "tst r1,#0x00020000;" |
| "addne r2,r2,#1;" |
| "movne r1,r1,lsr #1;" |
| "tst r1,#0x00010000;" |
| "addne r2,r2,#1;" |
| "mov %0,%0,lsr r2;" |
| "mov %1,%1,lsr r2;" |
| "add %2,%2,r2;" |
| |
| : "+r"(qi),"+r"(pi),"+r"(qexp) |
| : "r"(ilsp),"r"(wi),"r"(m) |
| : "r0","r1","r2","r3","cc"); |
| |
| *qip=qi; |
| *pip=pi; |
| *qexpp=qexp; |
| } |
| |
| static inline void lsp_norm_asm(ogg_uint32_t *qip,ogg_int32_t *qexpp){ |
| |
| ogg_uint32_t qi=*qip; |
| ogg_int32_t qexp=*qexpp; |
| |
| asm("tst %0,#0x0000ff00;" |
| "moveq %0,%0,lsl #8;" |
| "subeq %1,%1,#8;" |
| "tst %0,#0x0000f000;" |
| "moveq %0,%0,lsl #4;" |
| "subeq %1,%1,#4;" |
| "tst %0,#0x0000c000;" |
| "moveq %0,%0,lsl #2;" |
| "subeq %1,%1,#2;" |
| "tst %0,#0x00008000;" |
| "moveq %0,%0,lsl #1;" |
| "subeq %1,%1,#1;" |
| : "+r"(qi),"+r"(qexp) |
| : |
| : "cc"); |
| *qip=qi; |
| *qexpp=qexp; |
| } |
| |
| #endif |
| #endif |
| |
