d1e241f55a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30584 a1c6a512-1295-4272-9138-f99709370657
190 lines
6.2 KiB
C
190 lines
6.2 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
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* *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
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* *
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********************************************************************
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function: arm7 and later wide math functions
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********************************************************************/
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#ifdef _ARM_ASSEM_
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#if ARM_ARCH < 6
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#define INCL_OPTIMIZED_VECTOR_FMUL_WINDOW
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static inline void ff_vector_fmul_window_c(ogg_int32_t *dst, const ogg_int32_t *src0,
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const ogg_int32_t *src1, const ogg_int32_t *win, int len)
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{
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/* len is always a power of 2 and always >= 16 so this is unrolled 2 times*/
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ogg_int32_t *dst0 = dst, *dst1 = dst + 2*len;
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const ogg_int32_t *win0 = win, *win1 = win + 2*len;
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src1 += len;
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asm volatile ("cmp %[len], #0\n\t"
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"b 1f\n\t"
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"0:\n\t"
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"ldr r0, [%[src0]], #4\n\t"
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"ldr r1, [%[src1], #-4]!\n\t"
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"ldr r2, [%[win0]], #4\n\t"
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"ldr r3, [%[win1], #-4]!\n\t"
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"smull r4, r5, r0, r2\n\t"
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"smlal r4, r5, r1, r3\n\t"
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"rsb r2, r2, #0\n\t"
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"lsl r5, r5, #1\n\t"
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"str r5, [%[dst1], #-4]!\n\t"
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"smull r4, r5, r0, r3\n\t"
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"smlal r4, r5, r1, r2\n\t"
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"ldr r0, [%[src0]], #4\n\t"
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"ldr r1, [%[src1], #-4]!\n\t"
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"lsl r5, r5, #1\n\t"
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"str r5, [%[dst0]], #4\n\t"
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"ldr r2, [%[win0]], #4\n\t"
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"ldr r3, [%[win1], #-4]!\n\t"
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"smull r4, r5, r0, r2\n\t"
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"smlal r4, r5, r1, r3\n\t"
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"rsb r2, r2, #0\n\t"
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"lsl r5, r5, #1\n\t"
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"str r5, [%[dst1], #-4]!\n\t"
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"smull r4, r5, r0, r3\n\t"
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"smlal r4, r5, r1, r2\n\t"
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"subs %[len], %[len], #2\n\t"
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"lsl r5, r5, #1\n\t"
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"str r5, [%[dst0]], #4\n\t"
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"1:\n\t"
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"bgt 0b\n\t"
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: [dst0] "+r" (dst0), [dst1] "+r" (dst1),
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[src0] "+r" (src0), [src1] "+r" (src1),
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[win0] "+r" (win0), [win1] "+r" (win1),
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[len] "+r" (len)
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:: "r0", "r1", "r2", "r3", "r4", "r5", "cc", "memory");
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}
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#endif
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#ifndef _V_LSP_MATH_ASM
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#define _V_LSP_MATH_ASM
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static inline void lsp_loop_asm(ogg_uint32_t *qip,ogg_uint32_t *pip,
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ogg_int32_t *qexpp,
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ogg_int32_t *ilsp,ogg_int32_t wi,
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ogg_int32_t m){
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ogg_uint32_t qi=*qip,pi=*pip;
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ogg_int32_t qexp=*qexpp;
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asm("mov r0,%3;"
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"movs r1,%5,asr#1;"
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"add r0,r0,r1,lsl#3;"
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"beq 2f;\n"
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"1:"
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"ldmdb r0!,{r1,r3};"
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"subs r1,r1,%4;" //ilsp[j]-wi
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"rsbmi r1,r1,#0;" //labs(ilsp[j]-wi)
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"umull %0,r2,r1,%0;" //qi*=labs(ilsp[j]-wi)
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"subs r1,r3,%4;" //ilsp[j+1]-wi
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"rsbmi r1,r1,#0;" //labs(ilsp[j+1]-wi)
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"umull %1,r3,r1,%1;" //pi*=labs(ilsp[j+1]-wi)
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"cmn r2,r3;" // shift down 16?
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"beq 0f;"
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"add %2,%2,#16;"
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"mov %0,%0,lsr #16;"
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"orr %0,%0,r2,lsl #16;"
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"mov %1,%1,lsr #16;"
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"orr %1,%1,r3,lsl #16;"
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"0:"
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"cmp r0,%3;\n"
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"bhi 1b;\n"
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"2:"
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// odd filter assymetry
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"ands r0,%5,#1;\n"
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"beq 3f;\n"
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"add r0,%3,%5,lsl#2;\n"
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"ldr r1,[r0,#-4];\n"
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"mov r0,#0x4000;\n"
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"subs r1,r1,%4;\n" //ilsp[j]-wi
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"rsbmi r1,r1,#0;\n" //labs(ilsp[j]-wi)
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"umull %0,r2,r1,%0;\n" //qi*=labs(ilsp[j]-wi)
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"umull %1,r3,r0,%1;\n" //pi*=labs(ilsp[j+1]-wi)
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"cmn r2,r3;\n" // shift down 16?
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"beq 3f;\n"
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"add %2,%2,#16;\n"
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"mov %0,%0,lsr #16;\n"
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"orr %0,%0,r2,lsl #16;\n"
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"mov %1,%1,lsr #16;\n"
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"orr %1,%1,r3,lsl #16;\n"
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//qi=(pi>>shift)*labs(ilsp[j]-wi);
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//pi=(qi>>shift)*labs(ilsp[j+1]-wi);
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//qexp+=shift;
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//}
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/* normalize to max 16 sig figs */
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"3:"
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"mov r2,#0;"
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"orr r1,%0,%1;"
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"tst r1,#0xff000000;"
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"addne r2,r2,#8;"
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"movne r1,r1,lsr #8;"
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"tst r1,#0x00f00000;"
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"addne r2,r2,#4;"
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"movne r1,r1,lsr #4;"
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"tst r1,#0x000c0000;"
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"addne r2,r2,#2;"
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"movne r1,r1,lsr #2;"
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"tst r1,#0x00020000;"
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"addne r2,r2,#1;"
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"movne r1,r1,lsr #1;"
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"tst r1,#0x00010000;"
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"addne r2,r2,#1;"
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"mov %0,%0,lsr r2;"
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"mov %1,%1,lsr r2;"
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"add %2,%2,r2;"
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: "+r"(qi),"+r"(pi),"+r"(qexp)
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: "r"(ilsp),"r"(wi),"r"(m)
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: "r0","r1","r2","r3","cc");
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*qip=qi;
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*pip=pi;
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*qexpp=qexp;
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}
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static inline void lsp_norm_asm(ogg_uint32_t *qip,ogg_int32_t *qexpp){
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ogg_uint32_t qi=*qip;
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ogg_int32_t qexp=*qexpp;
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asm("tst %0,#0x0000ff00;"
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"moveq %0,%0,lsl #8;"
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"subeq %1,%1,#8;"
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"tst %0,#0x0000f000;"
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"moveq %0,%0,lsl #4;"
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"subeq %1,%1,#4;"
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"tst %0,#0x0000c000;"
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"moveq %0,%0,lsl #2;"
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"subeq %1,%1,#2;"
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"tst %0,#0x00008000;"
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"moveq %0,%0,lsl #1;"
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"subeq %1,%1,#1;"
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: "+r"(qi),"+r"(qexp)
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:
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: "cc");
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*qip=qi;
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*qexpp=qexp;
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}
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#endif
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#endif
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