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sbc: ARM NEON optimization for scale factors calculation

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Improves SBC encoding performance when joint stereo is not used.
Benchmarked on ARM Cortex-A8:

== Before: ==

$ time ./sbcenc -b53 -s8 test.au > /dev/null

real    0m4.756s
user    0m4.313s
sys     0m0.438s

samples  %        image name               symbol name
2569     27.6296  sbcenc                   sbc_pack_frame
1934     20.8002  sbcenc                   sbc_analyze_4b_8s_neon
1386     14.9064  sbcenc                   sbc_calculate_bits
1221     13.1319  sbcenc                   sbc_calc_scalefactors
996      10.7120  sbcenc                   sbc_enc_process_input_8s_be
878       9.4429  no-vmlinux               /no-vmlinux
204       2.1940  sbcenc                   sbc_encode
56        0.6023  libc-2.10.1.so           memcpy

== After: ==

$ time ./sbcenc -b53 -s8 test.au > /dev/null

real    0m4.220s
user    0m3.797s
sys     0m0.422s

samples  %        image name               symbol name
2563     31.3249  sbcenc                   sbc_pack_frame
1892     23.1239  sbcenc                   sbc_analyze_4b_8s_neon
1368     16.7196  sbcenc                   sbc_calculate_bits
961      11.7453  sbcenc                   sbc_enc_process_input_8s_be
836      10.2176  no-vmlinux               /no-vmlinux
262       3.2022  sbcenc                   sbc_calc_scalefactors_neon
199       2.4322  sbcenc                   sbc_encode
49        0.5989  libc-2.10.1.so           memcpy
This commit is contained in:
Siarhei Siamashka 2011-03-14 15:18:46 -03:00 • committed by Luiz Augusto von Dentz
parent 1f617ea9ec
commit fd7dc68ded
2 changed files with 59 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
src/modules/bluetooth/sbc/sbc.c
View file

@ -77,7 +77,7 @@ struct sbc_frame {
uint8_t joint;
/* only the lower 4 bits of every element are to be used */
uint32_t scale_factor[2][8];
uint32_t SBC_ALIGNED scale_factor[2][8];
/* raw integer subband samples in the frame */
int32_t SBC_ALIGNED sb_sample_f[16][2][8];

58
src/modules/bluetooth/sbc/sbc_primitives_neon.c
View file

@ -236,10 +236,68 @@ static inline void sbc_analyze_4b_8s_neon(int16_t *x,
_sbc_analyze_eight_neon(x + 0, out, analysis_consts_fixed8_simd_even);
}
static void sbc_calc_scalefactors_neon(
int32_t sb_sample_f[16][2][8],
uint32_t scale_factor[2][8],
int blocks, int channels, int subbands)
{
int ch, sb;
for (ch = 0; ch < channels; ch++) {
for (sb = 0; sb < subbands; sb += 4) {
int blk = blocks;
int32_t *in = &sb_sample_f[0][ch][sb];
asm volatile (
"vmov.s32 q0, %[c1]\n"
"vmov.s32 q1, %[c1]\n"
"1:\n"
"vld1.32 {d16, d17}, [%[in], :128], %[inc]\n"
"vabs.s32 q8, q8\n"
"vld1.32 {d18, d19}, [%[in], :128], %[inc]\n"
"vabs.s32 q9, q9\n"
"vld1.32 {d20, d21}, [%[in], :128], %[inc]\n"
"vabs.s32 q10, q10\n"
"vld1.32 {d22, d23}, [%[in], :128], %[inc]\n"
"vabs.s32 q11, q11\n"
"vcgt.s32 q12, q8, #0\n"
"vcgt.s32 q13, q9, #0\n"
"vcgt.s32 q14, q10, #0\n"
"vcgt.s32 q15, q11, #0\n"
"vadd.s32 q8, q8, q12\n"
"vadd.s32 q9, q9, q13\n"
"vadd.s32 q10, q10, q14\n"
"vadd.s32 q11, q11, q15\n"
"vorr.s32 q0, q0, q8\n"
"vorr.s32 q1, q1, q9\n"
"vorr.s32 q0, q0, q10\n"
"vorr.s32 q1, q1, q11\n"
"subs %[blk], %[blk], #4\n"
"bgt 1b\n"
"vorr.s32 q0, q0, q1\n"
"vmov.s32 q15, %[c2]\n"
"vclz.s32 q0, q0\n"
"vsub.s32 q0, q15, q0\n"
"vst1.32 {d0, d1}, [%[out], :128]\n"
:
[blk] "+r" (blk),
[in] "+r" (in)
:
[inc] "r" ((char *) &sb_sample_f[1][0][0] -
(char *) &sb_sample_f[0][0][0]),
[out] "r" (&scale_factor[ch][sb]),
[c1] "i" (1 << SCALE_OUT_BITS),
[c2] "i" (31 - SCALE_OUT_BITS)
: "d0", "d1", "d2", "d3", "d16", "d17", "d18", "d19",
"d20", "d21", "d22", "d23", "d24", "d25", "d26",
"d27", "d28", "d29", "d30", "d31", "cc", "memory");
}
}
}
void sbc_init_primitives_neon(struct sbc_encoder_state *state)
{
state->sbc_analyze_4b_4s = sbc_analyze_4b_4s_neon;
state->sbc_analyze_4b_8s = sbc_analyze_4b_8s_neon;
state->sbc_calc_scalefactors = sbc_calc_scalefactors_neon;
state->implementation_info = "NEON";
}