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/*
* Copyright (C) 2010 Mans Rullgard <mans@mansr.com>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_ARM_VP56_ARITH_H
#define AVCODEC_ARM_VP56_ARITH_H
#if CONFIG_THUMB
# define A(x)
# define T(x) x
#else
# define A(x) x
# define T(x)
#endif
#if CONFIG_THUMB || defined __clang__
# define L(x)
# define U(x) x
#else
# define L(x) x
# define U(x)
#endif
#if HAVE_ARMV6 && HAVE_INLINE_ASM
#define vp56_rac_get_prob vp56_rac_get_prob_armv6
static inline int vp56_rac_get_prob_armv6(VP56RangeCoder *c, int pr)
{
unsigned shift = ff_vp56_norm_shift[c->high];
unsigned code_word = c->code_word << shift;
unsigned high = c->high << shift;
unsigned bit;
__asm__ ("adds %3, %3, %0 \n"
"itt cs \n"
"cmpcs %7, %4 \n"
L("ldrcsh %2, [%4], #2 \n")
U("ldrhcs %2, [%4], #2 \n")
"rsb %0, %6, #256 \n"
"smlabb %0, %5, %6, %0 \n"
T("itttt cs \n")
"rev16cs %2, %2 \n"
T("lslcs %2, %2, %3 \n")
T("orrcs %1, %1, %2 \n")
A("orrcs %1, %1, %2, lsl %3 \n")
"subcs %3, %3, #16 \n"
"lsr %0, %0, #8 \n"
"cmp %1, %0, lsl #16 \n"
"ittte ge \n"
"subge %1, %1, %0, lsl #16 \n"
"subge %0, %5, %0 \n"
"movge %2, #1 \n"
"movlt %2, #0 \n"
: "=&r"(c->high), "=&r"(c->code_word), "=&r"(bit),
"+&r"(c->bits), "+&r"(c->buffer)
: "r"(high), "r"(pr), "r"(c->end - 1),
"0"(shift), "1"(code_word)
: "cc");
return bit;
}
#define vp56_rac_get_prob_branchy vp56_rac_get_prob_branchy_armv6
static inline int vp56_rac_get_prob_branchy_armv6(VP56RangeCoder *c, int pr)
{
unsigned shift = ff_vp56_norm_shift[c->high];
unsigned code_word = c->code_word << shift;
unsigned high = c->high << shift;
unsigned low;
unsigned tmp;
__asm__ ("adds %3, %3, %0 \n"
"itt cs \n"
"cmpcs %7, %4 \n"
L("ldrcsh %2, [%4], #2 \n")
U("ldrhcs %2, [%4], #2 \n")
"rsb %0, %6, #256 \n"
"smlabb %0, %5, %6, %0 \n"
T("itttt cs \n")
"rev16cs %2, %2 \n"
T("lslcs %2, %2, %3 \n")
T("orrcs %1, %1, %2 \n")
A("orrcs %1, %1, %2, lsl %3 \n")
"subcs %3, %3, #16 \n"
"lsr %0, %0, #8 \n"
"lsl %2, %0, #16 \n"
: "=&r"(low), "+&r"(code_word), "=&r"(tmp),
"+&r"(c->bits), "+&r"(c->buffer)
: "r"(high), "r"(pr), "r"(c->end - 1), "0"(shift)
: "cc");
if (code_word >= tmp) {
c->high = high - low;
c->code_word = code_word - tmp;
return 1;
}
c->high = low;
c->code_word = code_word;
return 0;
}
#endif
#endif /* AVCODEC_ARM_VP56_ARITH_H */
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