diff mbox series

[FFmpeg-devel,7/7] avfilter/vf_nlmeans: add x86 SIMD

Message ID 20211029151903.1078367-7-onemda@gmail.com
State New
Headers show
Series [FFmpeg-devel,1/7] avfilter/vf_nlmeans: use more friendlier 'for (int ...'
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Commit Message

Paul B Mahol Oct. 29, 2021, 3:19 p.m. UTC
Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 libavfilter/vf_nlmeans.c          |  3 +
 libavfilter/vf_nlmeans.h          |  1 +
 libavfilter/x86/Makefile          |  2 +
 libavfilter/x86/vf_nlmeans.asm    | 92 +++++++++++++++++++++++++++++++
 libavfilter/x86/vf_nlmeans_init.c | 40 ++++++++++++++
 5 files changed, 138 insertions(+)
 create mode 100644 libavfilter/x86/vf_nlmeans.asm
 create mode 100644 libavfilter/x86/vf_nlmeans_init.c

Comments

Michael Niedermayer Oct. 29, 2021, 4:30 p.m. UTC | #1
On Fri, Oct 29, 2021 at 05:19:03PM +0200, Paul B Mahol wrote:
> Signed-off-by: Paul B Mahol <onemda@gmail.com>
> ---
>  libavfilter/vf_nlmeans.c          |  3 +
>  libavfilter/vf_nlmeans.h          |  1 +
>  libavfilter/x86/Makefile          |  2 +
>  libavfilter/x86/vf_nlmeans.asm    | 92 +++++++++++++++++++++++++++++++
>  libavfilter/x86/vf_nlmeans_init.c | 40 ++++++++++++++
>  5 files changed, 138 insertions(+)
>  create mode 100644 libavfilter/x86/vf_nlmeans.asm
>  create mode 100644 libavfilter/x86/vf_nlmeans_init.c

on x86-32 linux:

src/libavfilter/x86/vf_nlmeans.asm:42: error: symbol `r9q' undefined
src//libavutil/x86/x86inc.asm:298: ... from macro `movsxdifnidn' defined here
src/libavfilter/x86/vf_nlmeans.asm:43: error: symbol `r10q' undefined
src//libavutil/x86/x86inc.asm:298: ... from macro `movsxdifnidn' defined here
src/libavfilter/x86/vf_nlmeans.asm:44: error: symbol `r8q' undefined
src//libavutil/x86/x86inc.asm:298: ... from macro `movsxdifnidn' defined here
src/libavfilter/x86/vf_nlmeans.asm:46: error: symbol `r10q' undefined
src//libavutil/x86/x86inc.asm:1154: ... from macro `sub' defined here
src/libavfilter/x86/vf_nlmeans.asm:47: error: symbol `r11q' undefined
src/libavfilter/x86/vf_nlmeans.asm:48: error: symbol `r11q' undefined
src//libavutil/x86/x86inc.asm:1151: ... from macro `sub' defined here
src/libavfilter/x86/vf_nlmeans.asm:49: error: symbol `r11q' undefined
src/libavfilter/x86/vf_nlmeans.asm:50: error: symbol `r10q' undefined
src/libavfilter/x86/vf_nlmeans.asm:51: error: symbol `r10q' undefined
src//libavutil/x86/x86inc.asm:1142: ... from macro `add' defined here
src/libavfilter/x86/vf_nlmeans.asm:53: error: symbol `r11q' undefined
src/libavfilter/x86/vf_nlmeans.asm:54: error: symbol `r9q' undefined
src/libavfilter/x86/vf_nlmeans.asm:60: error: symbol `r11q' undefined
src//libavutil/x86/x86inc.asm:1398: ... from macro `movdqu' defined here
src//libavutil/x86/x86inc.asm:1263: ... from macro `RUN_AVX_INSTR' defined here
src//libavutil/x86/x86inc.asm:1716: ... from macro `vmovdqu' defined here
src/libavfilter/x86/vf_nlmeans.asm:61: error: symbol `r11q' undefined
src//libavutil/x86/x86inc.asm:1398: ... from macro `movdqu' defined here
src//libavutil/x86/x86inc.asm:1263: ... from macro `RUN_AVX_INSTR' defined here
src//libavutil/x86/x86inc.asm:1716: ... from macro `vmovdqu' defined here
src/libavfilter/x86/vf_nlmeans.asm:62: error: symbol `r11q' undefined
src//libavutil/x86/x86inc.asm:1398: ... from macro `movdqu' defined here
src//libavutil/x86/x86inc.asm:1263: ... from macro `RUN_AVX_INSTR' defined here
src//libavutil/x86/x86inc.asm:1716: ... from macro `vmovdqu' defined here
src/libavfilter/x86/vf_nlmeans.asm:63: error: symbol `r11q' undefined
src//libavutil/x86/x86inc.asm:1398: ... from macro `movdqu' defined here
src//libavutil/x86/x86inc.asm:1263: ... from macro `RUN_AVX_INSTR' defined here
src//libavutil/x86/x86inc.asm:1716: ... from macro `vmovdqu' defined here
src/libavfilter/x86/vf_nlmeans.asm:65: error: symbol `r11q' undefined
src//libavutil/x86/x86inc.asm:1501: ... from macro `pmovzxbd' defined here
src//libavutil/x86/x86inc.asm:1263: ... from macro `RUN_AVX_INSTR' defined here
src/libavfilter/x86/vf_nlmeans.asm:74: error: symbol `r7q' undefined
src/libavfilter/x86/vf_nlmeans.asm:78: error: symbol `r11q' undefined
src//libavutil/x86/x86inc.asm:1417: ... from macro `movups' defined here
src//libavutil/x86/x86inc.asm:1263: ... from macro `RUN_AVX_INSTR' defined here
src/libavfilter/x86/vf_nlmeans.asm:79: error: symbol `r11q' undefined
src//libavutil/x86/x86inc.asm:1417: ... from macro `movups' defined here
src//libavutil/x86/x86inc.asm:1263: ... from macro `RUN_AVX_INSTR' defined here
src/libavfilter/x86/vf_nlmeans.asm:84: error: symbol `r11q' undefined
src//libavutil/x86/x86inc.asm:1417: ... from macro `movups' defined here
src//libavutil/x86/x86inc.asm:1263: ... from macro `RUN_AVX_INSTR' defined here
src/libavfilter/x86/vf_nlmeans.asm:85: error: symbol `r11q' undefined
src//libavutil/x86/x86inc.asm:1417: ... from macro `movups' defined here
src//libavutil/x86/x86inc.asm:1263: ... from macro `RUN_AVX_INSTR' defined here
src/libavfilter/x86/vf_nlmeans.asm:87: error: symbol `r11q' undefined
src//libavutil/x86/x86inc.asm:1139: ... from macro `add' defined here
src/libavfilter/x86/vf_nlmeans.asm:88: error: symbol `r11q' undefined
/home/michael/ffmpeg-git/ffmpeg/ffbuild/common.mak:92: recipe for target 'libavfilter/x86/vf_nlmeans.o' failed
make: *** [libavfilter/x86/vf_nlmeans.o] Error 1

[...]
James Almer Oct. 29, 2021, 5:04 p.m. UTC | #2
On 10/29/2021 12:19 PM, Paul B Mahol wrote:
> Signed-off-by: Paul B Mahol <onemda@gmail.com>
> ---
>   libavfilter/vf_nlmeans.c          |  3 +
>   libavfilter/vf_nlmeans.h          |  1 +
>   libavfilter/x86/Makefile          |  2 +
>   libavfilter/x86/vf_nlmeans.asm    | 92 +++++++++++++++++++++++++++++++
>   libavfilter/x86/vf_nlmeans_init.c | 40 ++++++++++++++
>   5 files changed, 138 insertions(+)
>   create mode 100644 libavfilter/x86/vf_nlmeans.asm
>   create mode 100644 libavfilter/x86/vf_nlmeans_init.c
> 
> diff --git a/libavfilter/vf_nlmeans.c b/libavfilter/vf_nlmeans.c
> index dee1f68101..4d5dcba5cc 100644
> --- a/libavfilter/vf_nlmeans.c
> +++ b/libavfilter/vf_nlmeans.c
> @@ -519,6 +519,9 @@ void ff_nlmeans_init(NLMeansDSPContext *dsp)
>   
>       if (ARCH_AARCH64)
>           ff_nlmeans_init_aarch64(dsp);
> +
> +    if (ARCH_X86)
> +        ff_nlmeans_init_x86(dsp);
>   }
>   
>   static av_cold int init(AVFilterContext *ctx)
> diff --git a/libavfilter/vf_nlmeans.h b/libavfilter/vf_nlmeans.h
> index cd1ee7c0bf..43611a03bd 100644
> --- a/libavfilter/vf_nlmeans.h
> +++ b/libavfilter/vf_nlmeans.h
> @@ -41,5 +41,6 @@ typedef struct NLMeansDSPContext {
>   
>   void ff_nlmeans_init(NLMeansDSPContext *dsp);
>   void ff_nlmeans_init_aarch64(NLMeansDSPContext *dsp);
> +void ff_nlmeans_init_x86(NLMeansDSPContext *dsp);
>   
>   #endif /* AVFILTER_NLMEANS_H */
> diff --git a/libavfilter/x86/Makefile b/libavfilter/x86/Makefile
> index a29941eaeb..e87481bd7a 100644
> --- a/libavfilter/x86/Makefile
> +++ b/libavfilter/x86/Makefile
> @@ -20,6 +20,7 @@ OBJS-$(CONFIG_LIMITER_FILTER)                += x86/vf_limiter_init.o
>   OBJS-$(CONFIG_LUT3D_FILTER)                  += x86/vf_lut3d_init.o
>   OBJS-$(CONFIG_MASKEDCLAMP_FILTER)            += x86/vf_maskedclamp_init.o
>   OBJS-$(CONFIG_MASKEDMERGE_FILTER)            += x86/vf_maskedmerge_init.o
> +OBJS-$(CONFIG_NLMEANS_FILTER)                += x86/vf_nlmeans_init.o
>   OBJS-$(CONFIG_NOISE_FILTER)                  += x86/vf_noise.o
>   OBJS-$(CONFIG_OVERLAY_FILTER)                += x86/vf_overlay_init.o
>   OBJS-$(CONFIG_PP7_FILTER)                    += x86/vf_pp7_init.o
> @@ -61,6 +62,7 @@ X86ASM-OBJS-$(CONFIG_LIMITER_FILTER)         += x86/vf_limiter.o
>   X86ASM-OBJS-$(CONFIG_LUT3D_FILTER)           += x86/vf_lut3d.o
>   X86ASM-OBJS-$(CONFIG_MASKEDCLAMP_FILTER)     += x86/vf_maskedclamp.o
>   X86ASM-OBJS-$(CONFIG_MASKEDMERGE_FILTER)     += x86/vf_maskedmerge.o
> +X86ASM-OBJS-$(CONFIG_NLMEANS_FILTER)         += x86/vf_nlmeans.o
>   X86ASM-OBJS-$(CONFIG_OVERLAY_FILTER)         += x86/vf_overlay.o
>   X86ASM-OBJS-$(CONFIG_PP7_FILTER)             += x86/vf_pp7.o
>   X86ASM-OBJS-$(CONFIG_PSNR_FILTER)            += x86/vf_psnr.o
> diff --git a/libavfilter/x86/vf_nlmeans.asm b/libavfilter/x86/vf_nlmeans.asm
> new file mode 100644
> index 0000000000..1047e43de4
> --- /dev/null
> +++ b/libavfilter/x86/vf_nlmeans.asm
> @@ -0,0 +1,92 @@
> +;*****************************************************************************
> +;* x86-optimized functions for nlmeans filter
> +;*
> +;* This file is part of FFmpeg.
> +;*
> +;* FFmpeg 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.
> +;*
> +;* FFmpeg 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 FFmpeg; if not, write to the Free Software
> +;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> +;******************************************************************************
> +
> +
> +%include "libavutil/x86/x86util.asm"
> +
> +%if HAVE_AVX2_EXTERNAL

Also check for ARCH_X86_64.

> +
> +SECTION_RODATA

No need for this if it's going to be emtpy.

> +
> +SECTION .text
> +
> +; void ff_compute_weights_line(const uint32_t *const iia,
> +;                              const uint32_t *const iib,
> +;                              const uint32_t *const iid,
> +;                              const uint32_t *const iie,
> +;                              const uint8_t *const src,
> +;                              struct weighted_avg *wa,
> +;                              const float *const lut,
> +;                              int max,
> +;                              int startx, int endx);
> +
> +INIT_YMM avx2
> +cglobal compute_weights_line, 11, 12, 7, iia, iib, iid, iie, src, total, sum, lut, max, startx, endx, x

cglobal compute_weights_line, 8, 11, 5, iia, iib, iid, iie, src, total, 
sum, lut, x, startx, endx

> +    movsxdifnidn startxq, startxd
> +    movsxdifnidn   endxq, endxd

movsxd       startxq, dword startxm
movsxd         endxq, dword endxm

> +    movsxdifnidn    maxq, maxd

Remove this

> +
> +    sub            endxq, startxq
> +    mov               xq, mmsize / 4
> +    sub               xq, 1
> +    not               xq
> +    and            endxq, xq
> +    add            endxq, startxq
> +
> +    mov               xq, startxq
> +    xor          startxq, startxq
> +
> +    VPBROADCASTD      m4, maxm

VPBROADCASTD      m4, r8m

> +    vpcmpeqd          m5, m5
> +
> +    .loop:
> +        movu  m0, [iieq + xq * 4]
> +        movu  m1, [iidq + xq * 4]
> +        movu  m2, [iibq + xq * 4]
> +        movu  m3, [iiaq + xq * 4]

Load only m0, remove the other three.

> +
> +        pmovzxbd m6, [srcq + xq]
> +        cvtdq2ps m6, m6
> +
> +        psubd  m0, m1
> +        psubd  m0, m2
> +        paddd  m0, m3

psubd  m0, [iidq + xq * 4]
psubd  m0, [iibq + xq * 4]
paddd  m0, [iiaq + xq * 4]

AVX can handle unaligned loads with these instructions.

> +        pminud m0, m4
> +        pslld  m0, 2
> +        mova   m3, m5
> +        vgatherdps m1, [lutq + m0], m3
> +
> +        mulps m0, m1, m6
> +
> +        movups m3, [totalq + xq * 4]
> +        movups m2, [sumq + xq * 4]
> +
> +        addps m0, m2
> +        addps m1, m3

addps m1, [totalq + xq * 4]
addps m0, [sumq + xq * 4]

Then you can change the ymm regs to use up to m4.

> +
> +        movups [totalq + xq * 4], m1
> +        movups [sumq + xq * 4], m0
> +
> +        add xq, mmsize / 4
> +        cmp xq, endxq
> +        jl .loop
> +    RET
> +
> +%endif
> diff --git a/libavfilter/x86/vf_nlmeans_init.c b/libavfilter/x86/vf_nlmeans_init.c
> new file mode 100644
> index 0000000000..6fbd8f9008
> --- /dev/null
> +++ b/libavfilter/x86/vf_nlmeans_init.c
> @@ -0,0 +1,40 @@
> +/*
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg 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.
> + *
> + * FFmpeg 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 FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +
> +#include "libavutil/attributes.h"
> +#include "libavutil/x86/cpu.h"
> +#include "libavfilter/vf_nlmeans.h"
> +
> +void ff_compute_weights_line_avx2(const uint32_t *const iia,
> +                                  const uint32_t *const iib,
> +                                  const uint32_t *const iid,
> +                                  const uint32_t *const iie,
> +                                  const uint8_t *const src,
> +                                  float *total_weight,
> +                                  float *sum,
> +                                  const float *const weight_lut,
> +                                  int max_meaningful_diff,
> +                                  int startx, int endx);
> +
> +av_cold void ff_nlmeans_init_x86(NLMeansDSPContext *dsp)
> +{
> +    int cpu_flags = av_get_cpu_flags();
> +
> +    if (EXTERNAL_AVX2_FAST(cpu_flags))

Also ARCH_X86_64.

> +        dsp->compute_weights_line = ff_compute_weights_line_avx2;
> +}
>
diff mbox series

Patch

diff --git a/libavfilter/vf_nlmeans.c b/libavfilter/vf_nlmeans.c
index dee1f68101..4d5dcba5cc 100644
--- a/libavfilter/vf_nlmeans.c
+++ b/libavfilter/vf_nlmeans.c
@@ -519,6 +519,9 @@  void ff_nlmeans_init(NLMeansDSPContext *dsp)
 
     if (ARCH_AARCH64)
         ff_nlmeans_init_aarch64(dsp);
+
+    if (ARCH_X86)
+        ff_nlmeans_init_x86(dsp);
 }
 
 static av_cold int init(AVFilterContext *ctx)
diff --git a/libavfilter/vf_nlmeans.h b/libavfilter/vf_nlmeans.h
index cd1ee7c0bf..43611a03bd 100644
--- a/libavfilter/vf_nlmeans.h
+++ b/libavfilter/vf_nlmeans.h
@@ -41,5 +41,6 @@  typedef struct NLMeansDSPContext {
 
 void ff_nlmeans_init(NLMeansDSPContext *dsp);
 void ff_nlmeans_init_aarch64(NLMeansDSPContext *dsp);
+void ff_nlmeans_init_x86(NLMeansDSPContext *dsp);
 
 #endif /* AVFILTER_NLMEANS_H */
diff --git a/libavfilter/x86/Makefile b/libavfilter/x86/Makefile
index a29941eaeb..e87481bd7a 100644
--- a/libavfilter/x86/Makefile
+++ b/libavfilter/x86/Makefile
@@ -20,6 +20,7 @@  OBJS-$(CONFIG_LIMITER_FILTER)                += x86/vf_limiter_init.o
 OBJS-$(CONFIG_LUT3D_FILTER)                  += x86/vf_lut3d_init.o
 OBJS-$(CONFIG_MASKEDCLAMP_FILTER)            += x86/vf_maskedclamp_init.o
 OBJS-$(CONFIG_MASKEDMERGE_FILTER)            += x86/vf_maskedmerge_init.o
+OBJS-$(CONFIG_NLMEANS_FILTER)                += x86/vf_nlmeans_init.o
 OBJS-$(CONFIG_NOISE_FILTER)                  += x86/vf_noise.o
 OBJS-$(CONFIG_OVERLAY_FILTER)                += x86/vf_overlay_init.o
 OBJS-$(CONFIG_PP7_FILTER)                    += x86/vf_pp7_init.o
@@ -61,6 +62,7 @@  X86ASM-OBJS-$(CONFIG_LIMITER_FILTER)         += x86/vf_limiter.o
 X86ASM-OBJS-$(CONFIG_LUT3D_FILTER)           += x86/vf_lut3d.o
 X86ASM-OBJS-$(CONFIG_MASKEDCLAMP_FILTER)     += x86/vf_maskedclamp.o
 X86ASM-OBJS-$(CONFIG_MASKEDMERGE_FILTER)     += x86/vf_maskedmerge.o
+X86ASM-OBJS-$(CONFIG_NLMEANS_FILTER)         += x86/vf_nlmeans.o
 X86ASM-OBJS-$(CONFIG_OVERLAY_FILTER)         += x86/vf_overlay.o
 X86ASM-OBJS-$(CONFIG_PP7_FILTER)             += x86/vf_pp7.o
 X86ASM-OBJS-$(CONFIG_PSNR_FILTER)            += x86/vf_psnr.o
diff --git a/libavfilter/x86/vf_nlmeans.asm b/libavfilter/x86/vf_nlmeans.asm
new file mode 100644
index 0000000000..1047e43de4
--- /dev/null
+++ b/libavfilter/x86/vf_nlmeans.asm
@@ -0,0 +1,92 @@ 
+;*****************************************************************************
+;* x86-optimized functions for nlmeans filter
+;*
+;* This file is part of FFmpeg.
+;*
+;* FFmpeg 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.
+;*
+;* FFmpeg 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 FFmpeg; if not, write to the Free Software
+;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+;******************************************************************************
+
+
+%include "libavutil/x86/x86util.asm"
+
+%if HAVE_AVX2_EXTERNAL
+
+SECTION_RODATA
+
+SECTION .text
+
+; void ff_compute_weights_line(const uint32_t *const iia,
+;                              const uint32_t *const iib,
+;                              const uint32_t *const iid,
+;                              const uint32_t *const iie,
+;                              const uint8_t *const src,
+;                              struct weighted_avg *wa,
+;                              const float *const lut,
+;                              int max,
+;                              int startx, int endx);
+
+INIT_YMM avx2
+cglobal compute_weights_line, 11, 12, 7, iia, iib, iid, iie, src, total, sum, lut, max, startx, endx, x
+    movsxdifnidn startxq, startxd
+    movsxdifnidn   endxq, endxd
+    movsxdifnidn    maxq, maxd
+
+    sub            endxq, startxq
+    mov               xq, mmsize / 4
+    sub               xq, 1
+    not               xq
+    and            endxq, xq
+    add            endxq, startxq
+
+    mov               xq, startxq
+    xor          startxq, startxq
+
+    VPBROADCASTD      m4, maxm
+    vpcmpeqd          m5, m5
+
+    .loop:
+        movu  m0, [iieq + xq * 4]
+        movu  m1, [iidq + xq * 4]
+        movu  m2, [iibq + xq * 4]
+        movu  m3, [iiaq + xq * 4]
+
+        pmovzxbd m6, [srcq + xq]
+        cvtdq2ps m6, m6
+
+        psubd  m0, m1
+        psubd  m0, m2
+        paddd  m0, m3
+        pminud m0, m4
+        pslld  m0, 2
+        mova   m3, m5
+        vgatherdps m1, [lutq + m0], m3
+
+        mulps m0, m1, m6
+
+        movups m3, [totalq + xq * 4]
+        movups m2, [sumq + xq * 4]
+
+        addps m0, m2
+        addps m1, m3
+
+        movups [totalq + xq * 4], m1
+        movups [sumq + xq * 4], m0
+
+        add xq, mmsize / 4
+        cmp xq, endxq
+        jl .loop
+    RET
+
+%endif
diff --git a/libavfilter/x86/vf_nlmeans_init.c b/libavfilter/x86/vf_nlmeans_init.c
new file mode 100644
index 0000000000..6fbd8f9008
--- /dev/null
+++ b/libavfilter/x86/vf_nlmeans_init.c
@@ -0,0 +1,40 @@ 
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/attributes.h"
+#include "libavutil/x86/cpu.h"
+#include "libavfilter/vf_nlmeans.h"
+
+void ff_compute_weights_line_avx2(const uint32_t *const iia,
+                                  const uint32_t *const iib,
+                                  const uint32_t *const iid,
+                                  const uint32_t *const iie,
+                                  const uint8_t *const src,
+                                  float *total_weight,
+                                  float *sum,
+                                  const float *const weight_lut,
+                                  int max_meaningful_diff,
+                                  int startx, int endx);
+
+av_cold void ff_nlmeans_init_x86(NLMeansDSPContext *dsp)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    if (EXTERNAL_AVX2_FAST(cpu_flags))
+        dsp->compute_weights_line = ff_compute_weights_line_avx2;
+}