[FFmpeg-devel] [PATCH 08/10] avcodec/idctdsp: Arm 64-bit NEON block add and clamp fast paths
Ben Avison
bavison at riscosopen.org
Fri Mar 25 20:52:55 EET 2022
checkasm benchmarks on 1.5 GHz Cortex-A72 are as follows.
idctdsp.add_pixels_clamped_c: 323.0
idctdsp.add_pixels_clamped_neon: 41.5
idctdsp.put_pixels_clamped_c: 243.0
idctdsp.put_pixels_clamped_neon: 30.0
idctdsp.put_signed_pixels_clamped_c: 225.7
idctdsp.put_signed_pixels_clamped_neon: 37.7
Signed-off-by: Ben Avison <bavison at riscosopen.org>
---
libavcodec/aarch64/Makefile | 3 +-
libavcodec/aarch64/idctdsp_init_aarch64.c | 26 +++--
libavcodec/aarch64/idctdsp_neon.S | 130 ++++++++++++++++++++++
3 files changed, 150 insertions(+), 9 deletions(-)
create mode 100644 libavcodec/aarch64/idctdsp_neon.S
diff --git a/libavcodec/aarch64/Makefile b/libavcodec/aarch64/Makefile
index 5b25e4dfb9..c8935f205e 100644
--- a/libavcodec/aarch64/Makefile
+++ b/libavcodec/aarch64/Makefile
@@ -44,7 +44,8 @@ NEON-OBJS-$(CONFIG_H264PRED) += aarch64/h264pred_neon.o
NEON-OBJS-$(CONFIG_H264QPEL) += aarch64/h264qpel_neon.o \
aarch64/hpeldsp_neon.o
NEON-OBJS-$(CONFIG_HPELDSP) += aarch64/hpeldsp_neon.o
-NEON-OBJS-$(CONFIG_IDCTDSP) += aarch64/simple_idct_neon.o
+NEON-OBJS-$(CONFIG_IDCTDSP) += aarch64/idctdsp_neon.o \
+ aarch64/simple_idct_neon.o
NEON-OBJS-$(CONFIG_MDCT) += aarch64/mdct_neon.o
NEON-OBJS-$(CONFIG_MPEGAUDIODSP) += aarch64/mpegaudiodsp_neon.o
NEON-OBJS-$(CONFIG_PIXBLOCKDSP) += aarch64/pixblockdsp_neon.o
diff --git a/libavcodec/aarch64/idctdsp_init_aarch64.c b/libavcodec/aarch64/idctdsp_init_aarch64.c
index 742a3372e3..eec21aa5a2 100644
--- a/libavcodec/aarch64/idctdsp_init_aarch64.c
+++ b/libavcodec/aarch64/idctdsp_init_aarch64.c
@@ -27,19 +27,29 @@
#include "libavcodec/idctdsp.h"
#include "idct.h"
+void ff_put_pixels_clamped_neon(const int16_t *, uint8_t *, ptrdiff_t);
+void ff_put_signed_pixels_clamped_neon(const int16_t *, uint8_t *, ptrdiff_t);
+void ff_add_pixels_clamped_neon(const int16_t *, uint8_t *, ptrdiff_t);
+
av_cold void ff_idctdsp_init_aarch64(IDCTDSPContext *c, AVCodecContext *avctx,
unsigned high_bit_depth)
{
int cpu_flags = av_get_cpu_flags();
- if (have_neon(cpu_flags) && !avctx->lowres && !high_bit_depth) {
- if (avctx->idct_algo == FF_IDCT_AUTO ||
- avctx->idct_algo == FF_IDCT_SIMPLEAUTO ||
- avctx->idct_algo == FF_IDCT_SIMPLENEON) {
- c->idct_put = ff_simple_idct_put_neon;
- c->idct_add = ff_simple_idct_add_neon;
- c->idct = ff_simple_idct_neon;
- c->perm_type = FF_IDCT_PERM_PARTTRANS;
+ if (have_neon(cpu_flags)) {
+ if (!avctx->lowres && !high_bit_depth) {
+ if (avctx->idct_algo == FF_IDCT_AUTO ||
+ avctx->idct_algo == FF_IDCT_SIMPLEAUTO ||
+ avctx->idct_algo == FF_IDCT_SIMPLENEON) {
+ c->idct_put = ff_simple_idct_put_neon;
+ c->idct_add = ff_simple_idct_add_neon;
+ c->idct = ff_simple_idct_neon;
+ c->perm_type = FF_IDCT_PERM_PARTTRANS;
+ }
}
+
+ c->add_pixels_clamped = ff_add_pixels_clamped_neon;
+ c->put_pixels_clamped = ff_put_pixels_clamped_neon;
+ c->put_signed_pixels_clamped = ff_put_signed_pixels_clamped_neon;
}
}
diff --git a/libavcodec/aarch64/idctdsp_neon.S b/libavcodec/aarch64/idctdsp_neon.S
new file mode 100644
index 0000000000..7f47611206
--- /dev/null
+++ b/libavcodec/aarch64/idctdsp_neon.S
@@ -0,0 +1,130 @@
+/*
+ * IDCT AArch64 NEON optimisations
+ *
+ * Copyright (c) 2022 Ben Avison <bavison at riscosopen.org>
+ *
+ * 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/aarch64/asm.S"
+
+// Clamp 16-bit signed block coefficients to unsigned 8-bit
+// On entry:
+// x0 -> array of 64x 16-bit coefficients
+// x1 -> 8-bit results
+// x2 = row stride for results, bytes
+function ff_put_pixels_clamped_neon, export=1
+ ld1 {v0.16b, v1.16b, v2.16b, v3.16b}, [x0], #64
+ ld1 {v4.16b, v5.16b, v6.16b, v7.16b}, [x0]
+ sqxtun v0.8b, v0.8h
+ sqxtun v1.8b, v1.8h
+ sqxtun v2.8b, v2.8h
+ sqxtun v3.8b, v3.8h
+ sqxtun v4.8b, v4.8h
+ st1 {v0.8b}, [x1], x2
+ sqxtun v0.8b, v5.8h
+ st1 {v1.8b}, [x1], x2
+ sqxtun v1.8b, v6.8h
+ st1 {v2.8b}, [x1], x2
+ sqxtun v2.8b, v7.8h
+ st1 {v3.8b}, [x1], x2
+ st1 {v4.8b}, [x1], x2
+ st1 {v0.8b}, [x1], x2
+ st1 {v1.8b}, [x1], x2
+ st1 {v2.8b}, [x1]
+ ret
+endfunc
+
+// Clamp 16-bit signed block coefficients to signed 8-bit (biased by 128)
+// On entry:
+// x0 -> array of 64x 16-bit coefficients
+// x1 -> 8-bit results
+// x2 = row stride for results, bytes
+function ff_put_signed_pixels_clamped_neon, export=1
+ ld1 {v0.16b, v1.16b, v2.16b, v3.16b}, [x0], #64
+ movi v4.8b, #128
+ ld1 {v16.16b, v17.16b, v18.16b, v19.16b}, [x0]
+ sqxtn v0.8b, v0.8h
+ sqxtn v1.8b, v1.8h
+ sqxtn v2.8b, v2.8h
+ sqxtn v3.8b, v3.8h
+ sqxtn v5.8b, v16.8h
+ add v0.8b, v0.8b, v4.8b
+ sqxtn v6.8b, v17.8h
+ add v1.8b, v1.8b, v4.8b
+ sqxtn v7.8b, v18.8h
+ add v2.8b, v2.8b, v4.8b
+ sqxtn v16.8b, v19.8h
+ add v3.8b, v3.8b, v4.8b
+ st1 {v0.8b}, [x1], x2
+ add v0.8b, v5.8b, v4.8b
+ st1 {v1.8b}, [x1], x2
+ add v1.8b, v6.8b, v4.8b
+ st1 {v2.8b}, [x1], x2
+ add v2.8b, v7.8b, v4.8b
+ st1 {v3.8b}, [x1], x2
+ add v3.8b, v16.8b, v4.8b
+ st1 {v0.8b}, [x1], x2
+ st1 {v1.8b}, [x1], x2
+ st1 {v2.8b}, [x1], x2
+ st1 {v3.8b}, [x1]
+ ret
+endfunc
+
+// Add 16-bit signed block coefficients to unsigned 8-bit
+// On entry:
+// x0 -> array of 64x 16-bit coefficients
+// x1 -> 8-bit input and results
+// x2 = row stride for 8-bit input and results, bytes
+function ff_add_pixels_clamped_neon, export=1
+ ld1 {v0.16b, v1.16b, v2.16b, v3.16b}, [x0], #64
+ mov x3, x1
+ ld1 {v4.8b}, [x1], x2
+ ld1 {v5.8b}, [x1], x2
+ ld1 {v6.8b}, [x1], x2
+ ld1 {v7.8b}, [x1], x2
+ ld1 {v16.16b, v17.16b, v18.16b, v19.16b}, [x0]
+ uaddw v0.8h, v0.8h, v4.8b
+ uaddw v1.8h, v1.8h, v5.8b
+ uaddw v2.8h, v2.8h, v6.8b
+ ld1 {v4.8b}, [x1], x2
+ uaddw v3.8h, v3.8h, v7.8b
+ ld1 {v5.8b}, [x1], x2
+ sqxtun v0.8b, v0.8h
+ ld1 {v6.8b}, [x1], x2
+ sqxtun v1.8b, v1.8h
+ ld1 {v7.8b}, [x1]
+ sqxtun v2.8b, v2.8h
+ sqxtun v3.8b, v3.8h
+ uaddw v4.8h, v16.8h, v4.8b
+ st1 {v0.8b}, [x3], x2
+ uaddw v0.8h, v17.8h, v5.8b
+ st1 {v1.8b}, [x3], x2
+ uaddw v1.8h, v18.8h, v6.8b
+ st1 {v2.8b}, [x3], x2
+ uaddw v2.8h, v19.8h, v7.8b
+ sqxtun v4.8b, v4.8h
+ sqxtun v0.8b, v0.8h
+ st1 {v3.8b}, [x3], x2
+ sqxtun v1.8b, v1.8h
+ sqxtun v2.8b, v2.8h
+ st1 {v4.8b}, [x3], x2
+ st1 {v0.8b}, [x3], x2
+ st1 {v1.8b}, [x3], x2
+ st1 {v2.8b}, [x3]
+ ret
+endfunc
--
2.25.1
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