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truehd: add hand-scheduled ARM asm version of ff_mlp_rematrix_channel.

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Profiling results for overall audio decode and the rematrix_channels function
in particular are as follows:

              Before          After
              Mean   StdDev   Mean   StdDev  Confidence  Change
6:2 total     370.8  17.0     348.8  20.1    99.9%       +6.3%
6:2 function  46.4   8.4      45.8   6.6     18.0%       +1.2%  (insignificant)
8:2 total     343.2  19.0     339.1  15.4    54.7%       +1.2%  (insignificant)
8:2 function  38.9   3.9      40.2   6.9     52.4%       -3.2%  (insignificant)
6:6 total     658.4  15.7     604.6  20.8    100.0%      +8.9%
6:6 function  109.0  8.7      59.5   5.4     100.0%      +83.3%
8:8 total     896.2  24.5     766.4  17.6    100.0%      +16.9%
8:8 function  223.4  12.8     93.8   5.0     100.0%      +138.3%

The assembly version has also been tested with a fuzz tester to ensure that
any combinations of inputs not exercised by my available test streams still
generate mathematically identical results to the C version.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
pull/64/head
Ben Avison 11 years ago committed by Michael Niedermayer
parent 80e67feda8
commit 89135716fd
2 changed files with 234 additions and 0 deletions
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  1. 222
      libavcodec/arm/mlpdsp_armv5te.S
  2. 12
      libavcodec/arm/mlpdsp_init_arm.c

222
libavcodec/arm/mlpdsp_armv5te.S
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@ -431,3 +431,225 @@ endfunc
.unreq ST3
.unreq I
.unreq PSAMP
/********************************************************************/
PSA .req a1 // samples
PCO .req a2 // coeffs
PBL .req a3 // bypassed_lsbs
INDEX .req a4
CO0 .req v1
CO1 .req v2
CO2 .req v3
CO3 .req v4
SA0 .req v5
SA1 .req v6
SA2 .req sl
SA3 .req fp
AC0 .req ip
AC1 .req lr
NOISE .req SA0
LSB .req SA1
DCH .req SA2 // dest_ch
MASK .req SA3
// INDEX is used as follows:
// bits 0..6 index2 (values up to 17, but wider so that we can
// add to index field without needing to mask)
// bits 7..14 i (values up to 160)
// bit 15 underflow detect for i
// bits 25..31 (if access_unit_size_pow2 == 128) \ index
// bits 26..31 (if access_unit_size_pow2 == 64) /
.macro implement_rematrix shift, index_mask, mask_minus1, maxchan
.if \maxchan == 1
// We can just leave the coefficients in registers in this case
ldrd CO0, CO1, [PCO]
.endif
1:
.if \maxchan == 1
ldrd SA0, SA1, [PSA]
smull AC0, AC1, CO0, SA0
.elseif \maxchan == 5
ldr CO0, [PCO, #0]
ldr SA0, [PSA, #0]
ldr CO1, [PCO, #4]
ldr SA1, [PSA, #4]
ldrd CO2, CO3, [PCO, #8]
smull AC0, AC1, CO0, SA0
ldrd SA2, SA3, [PSA, #8]
smlal AC0, AC1, CO1, SA1
ldrd CO0, CO1, [PCO, #16]
smlal AC0, AC1, CO2, SA2
ldrd SA0, SA1, [PSA, #16]
smlal AC0, AC1, CO3, SA3
smlal AC0, AC1, CO0, SA0
.else // \maxchan == 7
ldr CO2, [PCO, #0]
ldr SA2, [PSA, #0]
ldr CO3, [PCO, #4]
ldr SA3, [PSA, #4]
ldrd CO0, CO1, [PCO, #8]
smull AC0, AC1, CO2, SA2
ldrd SA0, SA1, [PSA, #8]
smlal AC0, AC1, CO3, SA3
ldrd CO2, CO3, [PCO, #16]
smlal AC0, AC1, CO0, SA0
ldrd SA2, SA3, [PSA, #16]
smlal AC0, AC1, CO1, SA1
ldrd CO0, CO1, [PCO, #24]
smlal AC0, AC1, CO2, SA2
ldrd SA0, SA1, [PSA, #24]
smlal AC0, AC1, CO3, SA3
smlal AC0, AC1, CO0, SA0
.endif
ldm sp, {NOISE, DCH, MASK}
smlal AC0, AC1, CO1, SA1
.if \shift != 0
.if \index_mask == 63
add NOISE, NOISE, INDEX, lsr #32-6
ldrb LSB, [PBL], #MAX_CHANNELS
ldrsb NOISE, [NOISE]
add INDEX, INDEX, INDEX, lsl #32-6
.else // \index_mask == 127
add NOISE, NOISE, INDEX, lsr #32-7
ldrb LSB, [PBL], #MAX_CHANNELS
ldrsb NOISE, [NOISE]
add INDEX, INDEX, INDEX, lsl #32-7
.endif
sub INDEX, INDEX, #1<<7
adds AC0, AC0, NOISE, lsl #\shift + 7
adc AC1, AC1, NOISE, asr #31
.else
ldrb LSB, [PBL], #MAX_CHANNELS
sub INDEX, INDEX, #1<<7
.endif
add PSA, PSA, #MAX_CHANNELS*4
mov AC0, AC0, lsr #14
orr AC0, AC0, AC1, lsl #18
.if !\mask_minus1
and AC0, AC0, MASK
.endif
add AC0, AC0, LSB
tst INDEX, #1<<15
str AC0, [PSA, DCH, lsl #2] // DCH is precompensated for the early increment of PSA
beq 1b
b 98f
.endm
.macro switch_on_maxchan shift, index_mask, mask_minus1
cmp v4, #5
blo 51f
beq 50f
implement_rematrix \shift, \index_mask, \mask_minus1, 7
50: implement_rematrix \shift, \index_mask, \mask_minus1, 5
51: implement_rematrix \shift, \index_mask, \mask_minus1, 1
.endm
.macro switch_on_mask shift, index_mask
cmp sl, #-1
bne 40f
switch_on_maxchan \shift, \index_mask, 1
40: switch_on_maxchan \shift, \index_mask, 0
.endm
.macro switch_on_au_size shift
.if \shift == 0
switch_on_mask \shift, undefined
.else
teq v6, #64
bne 30f
orr INDEX, INDEX, v1, lsl #32-6
switch_on_mask \shift, 63
30: orr INDEX, INDEX, v1, lsl #32-7
switch_on_mask \shift, 127
.endif
.endm
/* void ff_mlp_rematrix_channel_arm(int32_t *samples,
* const int32_t *coeffs,
* const uint8_t *bypassed_lsbs,
* const int8_t *noise_buffer,
* int index,
* unsigned int dest_ch,
* uint16_t blockpos,
* unsigned int maxchan,
* int matrix_noise_shift,
* int access_unit_size_pow2,
* int32_t mask);
*/
function ff_mlp_rematrix_channel_arm, export=1
push {v1-fp,lr}
add v1, sp, #9*4 // point at arguments on stack
ldm v1, {v1-sl}
teq v4, #1
itt ne
teqne v4, #5
teqne v4, #7
bne 99f
teq v6, #64
it ne
teqne v6, #128
bne 99f
sub v2, v2, #MAX_CHANNELS
push {a4,v2,sl} // initialise NOISE,DCH,MASK; make sp dword-aligned
movs INDEX, v3, lsl #7
beq 98f // just in case, do nothing if blockpos = 0
subs INDEX, INDEX, #1<<7 // offset by 1 so we borrow at the right time
adc lr, v1, v1 // calculate index2 (C was set by preceding subs)
orr INDEX, INDEX, lr
// Switch on matrix_noise_shift: values 0 and 1 are
// disproportionately common so do those in a form the branch
// predictor can accelerate. Values can only go up to 15.
cmp v5, #1
beq 11f
blo 10f
A ldr pc, [pc, v5, lsl #2]
T tbh [pc, v5, lsl #1]
0:
A .word 0, 0, 0, 12f, 13f, 14f, 15f, 16f, 17f, 18f, 19f, 20f, 21f, 22f, 23f, 24f, 25f
T .hword 0, 0, (12f - 0b) / 2, (13f - 0b) / 2, (14f - 0b) / 2, (15f - 0b) / 2
T .hword (16f - 0b) / 2, (17f - 0b) / 2, (18f - 0b) / 2, (19f - 0b) / 2
T .hword (20f - 0b) / 2, (21f - 0b) / 2, (22f - 0b) / 2, (23f - 0b) / 2, (24f - 0b) / 2, (25f - 0b) / 2
10: switch_on_au_size 0
11: switch_on_au_size 1
12: switch_on_au_size 2
13: switch_on_au_size 3
14: switch_on_au_size 4
15: switch_on_au_size 5
16: switch_on_au_size 6
17: switch_on_au_size 7
18: switch_on_au_size 8
19: switch_on_au_size 9
20: switch_on_au_size 10
21: switch_on_au_size 11
22: switch_on_au_size 12
23: switch_on_au_size 13
24: switch_on_au_size 14
25: switch_on_au_size 15
98: add sp, sp, #3*4
pop {v1-fp,pc}
99: // Can't handle these parameters, drop back to C
pop {v1-fp,lr}
b X(ff_mlp_rematrix_channel)
endfunc
.unreq PSA
.unreq PCO
.unreq PBL
.unreq INDEX
.unreq CO0
.unreq CO1
.unreq CO2
.unreq CO3
.unreq SA0
.unreq SA1
.unreq SA2
.unreq SA3
.unreq AC0
.unreq AC1
.unreq NOISE
.unreq LSB
.unreq DCH
.unreq MASK

12
libavcodec/arm/mlpdsp_init_arm.c
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@ -29,6 +29,17 @@ void ff_mlp_filter_channel_arm(int32_t *state, const int32_t *coeff,
int firorder, int iirorder,
unsigned int filter_shift, int32_t mask,
int blocksize, int32_t *sample_buffer);
void ff_mlp_rematrix_channel_arm(int32_t *samples,
const int32_t *coeffs,
const uint8_t *bypassed_lsbs,
const int8_t *noise_buffer,
int index,
unsigned int dest_ch,
uint16_t blockpos,
unsigned int maxchan,
int matrix_noise_shift,
int access_unit_size_pow2,
int32_t mask);
av_cold void ff_mlpdsp_init_arm(MLPDSPContext *c)
{
@ -36,5 +47,6 @@ av_cold void ff_mlpdsp_init_arm(MLPDSPContext *c)
if (have_armv5te(cpu_flags)) {
c->mlp_filter_channel = ff_mlp_filter_channel_arm;
c->mlp_rematrix_channel = ff_mlp_rematrix_channel_arm;
}
}

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