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/********************************************************************
* *
* 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 CPU_ARM
#if !defined(_V_WIDE_MATH) && !defined(_LOW_ACCURACY_)
#define _V_WIDE_MATH
static inline int32_t MULT32(int32_t x, int32_t y) {
int lo,hi;
asm volatile("smull\t%0, %1, %2, %3"
: "=&r"(lo),"=&r"(hi)
: "%r"(x),"r"(y) );
return(hi);
}
static inline int32_t MULT31(int32_t x, int32_t y) {
return MULT32(x,y)<<1;
}
static inline int32_t MULT31_SHIFT15(int32_t x, 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 XPROD32(a, b, t, v, x, y) \
{ \
long l; \
asm( "smull %0, %1, %4, %6\n\t" \
"rsb %3, %4, #0\n\t" \
"smlal %0, %1, %5, %7\n\t" \
"smull %0, %2, %5, %6\n\t" \
"smlal %0, %2, %3, %7" \
: "=&r" (l), "=&r" (x), "=&r" (y), "=r" ((a)) \
: "3" ((a)), "r" ((b)), "r" ((t)), "r" ((v)) ); \
}
static inline void XPROD31(int32_t a, int32_t b,
int32_t t, int32_t v,
int32_t *x, int32_t *y)
{
int x1, y1, l;
asm( "smull %0, %1, %4, %6\n\t"
"rsb %3, %4, #0\n\t"
"smlal %0, %1, %5, %7\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) );
*x = x1 << 1;
*y = y1 << 1;
}
static inline void XNPROD31(int32_t a, int32_t b,
int32_t t, int32_t v,
int32_t *x, int32_t *y)
{
int x1, y1, l;
asm( "smull %0, %1, %3, %5\n\t"
"rsb %2, %4, #0\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) );
*x = x1 << 1;
*y = y1 << 1;
}
#ifndef _V_VECT_OPS
#define _V_VECT_OPS
/* asm versions of vector operations for block.c, window.c */
static inline
void vect_add(int32_t *x, int32_t *y, int n)
{
while (n>=4) {
asm volatile ("ldmia %[x], {r0, r1, r2, r3};"
"ldmia %[y]!, {r4, r5, r6, r7};"
"add r0, r0, r4;"
"add r1, r1, r5;"
"add r2, r2, r6;"
"add r3, r3, r7;"
"stmia %[x]!, {r0, r1, r2, r3};"
: [x] "+r" (x), [y] "+r" (y)
: : "r0", "r1", "r2", "r3",
"r4", "r5", "r6", "r7",
"memory");
n -= 4;
}
/* add final elements */
while (n>0) {
*x++ += *y++;
n--;
}
}
static inline
void vect_copy(int32_t *x, int32_t *y, int n)
{
while (n>=4) {
asm volatile ("ldmia %[y]!, {r0, r1, r2, r3};"
"stmia %[x]!, {r0, r1, r2, r3};"
: [x] "+r" (x), [y] "+r" (y)
: : "r0", "r1", "r2", "r3",
"memory");
n -= 4;
}
/* copy final elements */
while (n>0) {
*x++ = *y++;
n--;
}
}
static inline
void vect_mult_fw(int32_t *data, int32_t *window, int n)
{
while (n>=4) {
asm volatile ("ldmia %[d], {r0, r1, r2, r3};"
"ldmia %[w]!, {r4, r5, r6, r7};"
"smull r8, r9, r0, r4;"
"mov r0, r9, lsl #1;"
"smull r8, r9, r1, r5;"
"mov r1, r9, lsl #1;"
"smull r8, r9, r2, r6;"
"mov r2, r9, lsl #1;"
"smull r8, r9, r3, r7;"
"mov r3, r9, lsl #1;"
"stmia %[d]!, {r0, r1, r2, r3};"
: [d] "+r" (data), [w] "+r" (window)
: : "r0", "r1", "r2", "r3",
"r4", "r5", "r6", "r7", "r8", "r9",
"memory" );
n -= 4;
}
while(n>0) {
*data = MULT31(*data, *window);
data++;
window++;
n--;
}
}
static inline
void vect_mult_bw(int32_t *data, int32_t *window, int n)
{
while (n>=4) {
asm volatile ("ldmia %[d], {r0, r1, r2, r3};"
"ldmda %[w]!, {r4, r5, r6, r7};"
"smull r8, r9, r0, r7;"
"mov r0, r9, lsl #1;"
"smull r8, r9, r1, r6;"
"mov r1, r9, lsl #1;"
"smull r8, r9, r2, r5;"
"mov r2, r9, lsl #1;"
"smull r8, r9, r3, r4;"
"mov r3, r9, lsl #1;"
"stmia %[d]!, {r0, r1, r2, r3};"
: [d] "+r" (data), [w] "+r" (window)
: : "r0", "r1", "r2", "r3",
"r4", "r5", "r6", "r7", "r8", "r9",
"memory" );
n -= 4;
}
while(n>0) {
*data = MULT31(*data, *window);
data++;
window--;
n--;
}
}
#endif
#endif
#ifndef _V_CLIP_MATH
#define _V_CLIP_MATH
static inline int32_t CLIP_TO_15(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
#endif
#endif
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