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rockbox/apps/codecs/demac/libdemac/vector_math16_armv6.h

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C
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/*
libdemac - A Monkey's Audio decoder
$Id$
Copyright (C) Dave Chapman 2007
ARMv6 vector math copyright (C) 2008 Jens Arnold
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 program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
*/
/* This version fetches data as 32 bit words, and *requires* v1 to be
* 32 bit aligned, otherwise it will result either in a data abort, or
* incorrect results (if ARM aligncheck is disabled). */
static inline void vector_add(int16_t* v1, int16_t* v2)
{
#if ORDER > 32
int cnt = ORDER>>5;
#endif
#if ORDER > 16
#define ADD_SUB_BLOCKS "4"
#else
#define ADD_SUB_BLOCKS "2"
#endif
asm volatile (
"tst %[v2], #2 \n"
"beq 20f \n"
"10: \n"
"ldrh r4, [%[v2]], #2 \n"
"ldr r5, [%[v2]], #4 \n"
"mov r4, r4, lsl #16 \n"
"1: \n"
".rept " ADD_SUB_BLOCKS "\n"
"ldmia %[v2]!, {r6-r7} \n"
"ldmia %[v1], {r0-r3} \n"
"mov r5, r5, ror #16 \n"
"pkhtb r4, r5, r4, asr #16 \n"
"sadd16 r0, r0, r4 \n"
"pkhbt r5, r5, r6, lsl #16 \n"
"sadd16 r1, r1, r5 \n"
"ldmia %[v2]!, {r4-r5} \n"
"mov r7, r7, ror #16 \n"
"pkhtb r6, r7, r6, asr #16 \n"
"sadd16 r2, r2, r6 \n"
"pkhbt r7, r7, r4, lsl #16 \n"
"sadd16 r3, r3, r7 \n"
"stmia %[v1]!, {r0-r3} \n"
".endr \n"
#if ORDER > 32
"subs %[cnt], %[cnt], #1 \n"
"bne 1b \n"
#endif
"b 99f \n"
"20: \n"
"1: \n"
".rept " ADD_SUB_BLOCKS "\n"
"ldmia %[v2]!, {r4-r7} \n"
"ldmia %[v1], {r0-r3} \n"
"sadd16 r0, r0, r4 \n"
"sadd16 r1, r1, r5 \n"
"sadd16 r2, r2, r6 \n"
"sadd16 r3, r3, r7 \n"
"stmia %[v1]!, {r0-r3} \n"
".endr \n"
#if ORDER > 32
"subs %[cnt], %[cnt], #1 \n"
"bne 1b \n"
#endif
"99: \n"
: /* outputs */
#if ORDER > 32
[cnt]"+r"(cnt),
#endif
[v1] "+r"(v1),
[v2] "+r"(v2)
: /* inputs */
: /* clobbers */
"r0", "r1", "r2", "r3", "r4",
"r5", "r6", "r7", "memory"
);
}
/* This version fetches data as 32 bit words, and *requires* v1 to be
* 32 bit aligned, otherwise it will result either in a data abort, or
* incorrect results (if ARM aligncheck is disabled). */
static inline void vector_sub(int16_t* v1, int16_t* v2)
{
#if ORDER > 32
int cnt = ORDER>>5;
#endif
asm volatile (
"tst %[v2], #2 \n"
"beq 20f \n"
"10: \n"
"ldrh r4, [%[v2]], #2 \n"
"ldr r5, [%[v2]], #4 \n"
"mov r4, r4, lsl #16 \n"
"1: \n"
".rept " ADD_SUB_BLOCKS "\n"
"ldmia %[v2]!, {r6-r7} \n"
"ldmia %[v1], {r0-r3} \n"
"mov r5, r5, ror #16 \n"
"pkhtb r4, r5, r4, asr #16 \n"
"ssub16 r0, r0, r4 \n"
"pkhbt r5, r5, r6, lsl #16 \n"
"ssub16 r1, r1, r5 \n"
"ldmia %[v2]!, {r4-r5} \n"
"mov r7, r7, ror #16 \n"
"pkhtb r6, r7, r6, asr #16 \n"
"ssub16 r2, r2, r6 \n"
"pkhbt r7, r7, r4, lsl #16 \n"
"ssub16 r3, r3, r7 \n"
"stmia %[v1]!, {r0-r3} \n"
".endr \n"
#if ORDER > 32
"subs %[cnt], %[cnt], #1 \n"
"bne 1b \n"
#endif
"b 99f \n"
"20: \n"
"1: \n"
".rept " ADD_SUB_BLOCKS "\n"
"ldmia %[v2]!, {r4-r7} \n"
"ldmia %[v1], {r0-r3} \n"
"ssub16 r0, r0, r4 \n"
"ssub16 r1, r1, r5 \n"
"ssub16 r2, r2, r6 \n"
"ssub16 r3, r3, r7 \n"
"stmia %[v1]!, {r0-r3} \n"
".endr \n"
#if ORDER > 32
"subs %[cnt], %[cnt], #1 \n"
"bne 1b \n"
#endif
"99: \n"
: /* outputs */
#if ORDER > 32
[cnt]"+r"(cnt),
#endif
[v1] "+r"(v1),
[v2] "+r"(v2)
: /* inputs */
: /* clobbers */
"r0", "r1", "r2", "r3", "r4",
"r5", "r6", "r7", "memory"
);
}
/* This version fetches data as 32 bit words, and *requires* v1 to be
* 32 bit aligned, otherwise it will result either in a data abort, or
* incorrect results (if ARM aligncheck is disabled). */
static inline int32_t scalarproduct(int16_t* v1, int16_t* v2)
{
int res;
#if ORDER > 32
int cnt = ORDER>>5;
#endif
#if ORDER > 16
#define MLA_BLOCKS "3"
#else
#define MLA_BLOCKS "1"
#endif
asm volatile (
#if ORDER > 32
"mov %[res], #0 \n"
#endif
"tst %[v2], #2 \n"
"beq 20f \n"
"10: \n"
"ldrh r7, [%[v2]], #2 \n"
"ldmia %[v2]!, {r4-r5} \n"
"ldmia %[v1]!, {r0-r1} \n"
#if ORDER > 32
"mov r7, r7, lsl #16 \n"
"1: \n"
"pkhbt r8, r4, r7 \n"
"ldmia %[v2]!, {r6-r7} \n"
"smladx %[res], r0, r8, %[res] \n"
#else
"pkhbt r8, r4, r7, lsl #16 \n"
"ldmia %[v2]!, {r6-r7} \n"
"smuadx %[res], r0, r8 \n"
#endif
".rept " MLA_BLOCKS "\n"
"pkhbt r8, r5, r4 \n"
"ldmia %[v1]!, {r2-r3} \n"
"smladx %[res], r1, r8, %[res] \n"
"pkhbt r8, r6, r5 \n"
"ldmia %[v2]!, {r4-r5} \n"
"smladx %[res], r2, r8, %[res] \n"
"pkhbt r8, r7, r6 \n"
"ldmia %[v1]!, {r0-r1} \n"
"smladx %[res], r3, r8, %[res] \n"
"pkhbt r8, r4, r7 \n"
"ldmia %[v2]!, {r6-r7} \n"
"smladx %[res], r0, r8, %[res] \n"
".endr \n"
"pkhbt r8, r5, r4 \n"
"ldmia %[v1]!, {r2-r3} \n"
"smladx %[res], r1, r8, %[res] \n"
"pkhbt r8, r6, r5 \n"
#if ORDER > 32
"subs %[cnt], %[cnt], #1 \n"
"ldmneia %[v2]!, {r4-r5} \n"
"smladx %[res], r2, r8, %[res] \n"
"pkhbt r8, r7, r6 \n"
"ldmneia %[v1]!, {r0-r1} \n"
"smladx %[res], r3, r8, %[res] \n"
"bne 1b \n"
#else
"pkhbt r7, r7, r6 \n"
"smladx %[res], r2, r8, %[res] \n"
"smladx %[res], r3, r7, %[res] \n"
#endif
"b 99f \n"
"20: \n"
"ldmia %[v1]!, {r0-r1} \n"
"ldmia %[v2]!, {r5-r7} \n"
"1: \n"
"ldmia %[v1]!, {r2-r3} \n"
#if ORDER > 32
"smlad %[res], r0, r5, %[res] \n"
#else
"smuad %[res], r0, r5 \n"
#endif
".rept " MLA_BLOCKS "\n"
"ldmia %[v2]!, {r4-r5} \n"
"smlad %[res], r1, r6, %[res] \n"
"ldmia %[v1]!, {r0-r1} \n"
"smlad %[res], r2, r7, %[res] \n"
"ldmia %[v2]!, {r6-r7} \n"
"smlad %[res], r3, r4, %[res] \n"
"ldmia %[v1]!, {r2-r3} \n"
"smlad %[res], r0, r5, %[res] \n"
".endr \n"
"ldmia %[v2]!, {r4-r5} \n"
"smlad %[res], r1, r6, %[res] \n"
#if ORDER > 32
"subs %[cnt], %[cnt], #1 \n"
"ldmneia %[v1]!, {r0-r1} \n"
"smlad %[res], r2, r7, %[res] \n"
"ldmneia %[v2]!, {r6-r7} \n"
"smlad %[res], r3, r4, %[res] \n"
"bne 1b \n"
#else
"smlad %[res], r2, r7, %[res] \n"
"smlad %[res], r3, r4, %[res] \n"
#endif
"99: \n"
: /* outputs */
#if ORDER > 32
[cnt]"+r"(cnt),
#endif
[v1] "+r"(v1),
[v2] "+r"(v2),
[res]"=r"(res)
: /* inputs */
: /* clobbers */
"r0", "r1", "r2", "r3", "r4",
"r5", "r6", "r7", "r8"
);
return res;
}
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