[1/5] arm: vp9itxfm: Make the larger core transforms standalone functions

diff mbox

This work is sponsored by, and copyright, Google.

This reduces the code size of libavcodec/arm/vp9itxfm_neon.o from
15324 to 12388 bytes.

This gives a small slowdown of a couple tens of cycles, up to around
150 cycles for the full case of the largest transform, but makes
it more feasible to add more optimized versions of these transforms.

Before:                              Cortex A7       A8       A9      A53
vp9_inv_dct_dct_16x16_sub4_add_neon:    2063.4   1516.0   1719.5   1245.1
vp9_inv_dct_dct_16x16_sub16_add_neon:   3279.3   2454.5   2525.2   1982.3
vp9_inv_dct_dct_32x32_sub4_add_neon:   10750.0   7955.4   8525.6   6754.2
vp9_inv_dct_dct_32x32_sub32_add_neon:  18574.0  17108.4  14216.7  12010.2

After:
vp9_inv_dct_dct_16x16_sub4_add_neon:    2060.8   1608.5   1735.7   1262.0
vp9_inv_dct_dct_16x16_sub16_add_neon:   3211.2   2443.5   2546.1   1999.5
vp9_inv_dct_dct_32x32_sub4_add_neon:   10682.0   8043.8   8581.3   6810.1
vp9_inv_dct_dct_32x32_sub32_add_neon:  18522.4  17277.4  14286.7  12087.9
---
 libavcodec/arm/vp9itxfm_neon.S | 43 +++++++++++++++++++++++++-----------------
 1 file changed, 26 insertions(+), 17 deletions(-)

On 2016-12-01 11:26:56 +0200, Martin Storsjö wrote:
> This work is sponsored by, and copyright, Google.
> 
> This reduces the code size of libavcodec/arm/vp9itxfm_neon.o from
> 15324 to 12388 bytes.
> 
> This gives a small slowdown of a couple tens of cycles, up to around
> 150 cycles for the full case of the largest transform, but makes
> it more feasible to add more optimized versions of these transforms.
> 
> Before:                              Cortex A7       A8       A9      A53
> vp9_inv_dct_dct_16x16_sub4_add_neon:    2063.4   1516.0   1719.5   1245.1
> vp9_inv_dct_dct_16x16_sub16_add_neon:   3279.3   2454.5   2525.2   1982.3
> vp9_inv_dct_dct_32x32_sub4_add_neon:   10750.0   7955.4   8525.6   6754.2
> vp9_inv_dct_dct_32x32_sub32_add_neon:  18574.0  17108.4  14216.7  12010.2
> 
> After:
> vp9_inv_dct_dct_16x16_sub4_add_neon:    2060.8   1608.5   1735.7   1262.0
> vp9_inv_dct_dct_16x16_sub16_add_neon:   3211.2   2443.5   2546.1   1999.5
> vp9_inv_dct_dct_32x32_sub4_add_neon:   10682.0   8043.8   8581.3   6810.1
> vp9_inv_dct_dct_32x32_sub32_add_neon:  18522.4  17277.4  14286.7  12087.9
> ---
>  libavcodec/arm/vp9itxfm_neon.S | 43 +++++++++++++++++++++++++-----------------
>  1 file changed, 26 insertions(+), 17 deletions(-)
> 
> diff --git a/libavcodec/arm/vp9itxfm_neon.S b/libavcodec/arm/vp9itxfm_neon.S
> index 5abe435..22e63e5 100644
> --- a/libavcodec/arm/vp9itxfm_neon.S
> +++ b/libavcodec/arm/vp9itxfm_neon.S
> @@ -534,7 +534,7 @@ function idct16x16_dc_add_neon
>  endfunc
>  .ltorg
>  
> -.macro idct16
> +function idct16
>          mbutterfly0     d16, d24, d16, d24, d4, d6,  q2,  q3 @ d16 = t0a,  d24 = t1a
>          mbutterfly      d20, d28, d0[1], d0[2], q2,  q3  @ d20 = t2a,  d28 = t3a
>          mbutterfly      d18, d30, d0[3], d1[0], q2,  q3  @ d18 = t4a,  d30 = t7a
> @@ -580,9 +580,10 @@ endfunc
>          vmov            d4,  d21                         @ d4  = t10a
>          butterfly       d20, d27, d6,  d27               @ d20 = out[4], d27 = out[11]
>          butterfly       d21, d26, d26, d4                @ d21 = out[5], d26 = out[10]
> -.endm
> +        bx              lr
> +endfunc
>  
> -.macro iadst16
> +function iadst16
>          movrel          r12, iadst16_coeffs
>          vld1.16         {q0-q1}, [r12,:128]
>  
> @@ -653,7 +654,8 @@ endfunc
>  
>          vmov            d16, d2
>          vmov            d30, d4
> -.endm
> +        bx              lr
> +endfunc
>  
>  .macro itxfm16_1d_funcs txfm
>  @ Read a vertical 4x16 slice out of a 16x16 matrix, do a transform on it,
> @@ -662,6 +664,8 @@ endfunc
>  @ r1 = slice offset
>  @ r2 = src
>  function \txfm\()16_1d_4x16_pass1_neon
> +        push            {lr}
> +
>          mov             r12, #32
>          vmov.s16        q2, #0
>  .irp i, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
> @@ -669,7 +673,7 @@ function \txfm\()16_1d_4x16_pass1_neon
>          vst1.16         {d4},  [r2,:64], r12
>  .endr
>  
> -        \txfm\()16
> +        bl              \txfm\()16
>  
>          @ Do four 4x4 transposes. Originally, d16-d31 contain the
>          @ 16 rows. Afterwards, d16-d19, d20-d23, d24-d27, d28-d31
> @@ -682,7 +686,7 @@ function \txfm\()16_1d_4x16_pass1_neon
>  .irp i, 16, 20, 24, 28, 17, 21, 25, 29, 18, 22, 26, 30, 19, 23, 27, 31
>          vst1.16         {d\i}, [r0,:64]!
>  .endr
> -        bx              lr
> +        pop             {pc}
>  1:
>          @ Special case: For the last input column (r1 == 12),
>          @ which would be stored as the last row in the temp buffer,
> @@ -709,7 +713,7 @@ function \txfm\()16_1d_4x16_pass1_neon
>          vmov            d29, d17
>          vmov            d30, d18
>          vmov            d31, d19
> -        bx              lr
> +        pop             {pc}
>  endfunc
>  
>  @ Read a vertical 4x16 slice out of a 16x16 matrix, do a transform on it,
> @@ -719,6 +723,7 @@ endfunc
>  @ r2 = src (temp buffer)
>  @ r3 = slice offset
>  function \txfm\()16_1d_4x16_pass2_neon
> +        push            {lr}
>          mov             r12, #32
>  .irp i, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27
>          vld1.16         {d\i}, [r2,:64], r12
> @@ -732,7 +737,7 @@ function \txfm\()16_1d_4x16_pass2_neon
>  
>          add             r3,  r0,  r1
>          lsl             r1,  r1,  #1
> -        \txfm\()16
> +        bl              \txfm\()16
>  
>  .macro load_add_store coef0, coef1, coef2, coef3
>          vrshr.s16       \coef0, \coef0, #6
> @@ -773,7 +778,7 @@ function \txfm\()16_1d_4x16_pass2_neon
>          load_add_store  q12, q13, q14, q15
>  .purgem load_add_store
>  
> -        bx              lr
> +        pop             {pc}
>  endfunc
>  .endm
>  
> @@ -908,7 +913,7 @@ function idct32x32_dc_add_neon
>          bx              lr
>  endfunc
>  
> -.macro idct32_odd
> +function idct32_odd
>          movrel          r12, idct_coeffs
>          add             r12, r12, #32
>          vld1.16         {q0-q1}, [r12,:128]
> @@ -967,7 +972,8 @@ endfunc
>          mbutterfly0     d26, d21, d26, d21, d4, d6, q2, q3 @ d26 = t26a, d21 = t21a
>          mbutterfly0     d25, d22, d25, d22, d4, d6, q2, q3 @ d25 = t25,  d22 = t22
>          mbutterfly0     d24, d23, d24, d23, d4, d6, q2, q3 @ d24 = t24a, d23 = t23a
> -.endm
> +        bx              lr
> +endfunc
>  
>  @ Do an 32-point IDCT of a 4x32 slice out of a 32x32 matrix.
>  @ We don't have register space to do a single pass IDCT of 4x32 though,
> @@ -979,6 +985,8 @@ endfunc
>  @ r1 = unused
>  @ r2 = src
>  function idct32_1d_4x32_pass1_neon
> +        push            {lr}
> +
>          movrel          r12, idct_coeffs
>          vld1.16         {q0-q1}, [r12,:128]
>  
> @@ -992,7 +1000,7 @@ function idct32_1d_4x32_pass1_neon
>          vst1.16         {d4},  [r2,:64], r12
>  .endr
>  
> -        idct16
> +        bl              idct16
>  
>          @ Do four 4x4 transposes. Originally, d16-d31 contain the
>          @ 16 rows. Afterwards, d16-d19, d20-d23, d24-d27, d28-d31
> @@ -1028,7 +1036,7 @@ function idct32_1d_4x32_pass1_neon
>          vst1.16         {d4},  [r2,:64], r12
>  .endr
>  
> -        idct32_odd
> +        bl              idct32_odd
>  
>          transpose16_q_4x_4x4 q15, q14, q13, q12, q11, q10, q9,  q8,  d31, d30, d29, d28, d27, d26, d25, d24, d23, d22, d21, d20, d19, d18, d17, d16
>  
> @@ -1054,7 +1062,7 @@ function idct32_1d_4x32_pass1_neon
>          store_rev       29, 25, 21, 17
>          store_rev       28, 24, 20, 16
>  .purgem store_rev
> -        bx              lr
> +        pop             {pc}
>  endfunc
>  .ltorg
>  
> @@ -1065,6 +1073,7 @@ endfunc
>  @ r1 = dst stride
>  @ r2 = src (temp buffer)
>  function idct32_1d_4x32_pass2_neon
> +        push            {lr}
>          movrel          r12, idct_coeffs
>          vld1.16         {q0-q1}, [r12,:128]
>  
> @@ -1075,7 +1084,7 @@ function idct32_1d_4x32_pass2_neon
>  .endr
>          sub             r2,  r2,  r12, lsl #4
>  
> -        idct16
> +        bl              idct16
>  
>  .irp i, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
>          vst1.16         {d\i}, [r2,:64], r12
> @@ -1091,7 +1100,7 @@ function idct32_1d_4x32_pass2_neon
>          sub             r2,  r2,  r12, lsl #4
>          sub             r2,  r2,  #64
>  
> -        idct32_odd
> +        bl              idct32_odd
>  
>          mov             r12, #128
>  .macro load_acc_store a, b, c, d, neg=0
> @@ -1139,7 +1148,7 @@ function idct32_1d_4x32_pass2_neon
>          load_acc_store  24, 25, 26, 27, 1
>          load_acc_store  28, 29, 30, 31, 1
>  .purgem load_acc_store
> -        bx              lr
> +        pop             {pc}
>  endfunc
>  
>  const min_eob_idct_idct_32, align=4

ok. sorry for the delay.

Janne