avcodec/ac3: Implement float_to_fixed24 for aarch64 NEON

Signed-off-by: Geoff Hill <geoff@geoffhill.org>
Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 36 insertions, 0 deletions

diff --git a/libavcodec/aarch64/ac3dsp_neon.S b/libavcodec/aarch64/ac3dsp_neon.S
new file mode 100644
index 0000000000..c4d204b51a
--- /dev/null
+++ b/libavcodec/aarch64/ac3dsp_neon.S
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2011 Mans Rullgard <mans@mansr.com>
+ * Copyright (c) 2024 Geoff Hill <geoff@geoffhill.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 General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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"
+
+function ff_float_to_fixed24_neon, export=1
+1:      ld1             {v0.4s, v1.4s}, [x1], #32
+        fcvtzs          v0.4s, v0.4s, #24
+        ld1             {v2.4s, v3.4s}, [x1], #32
+        fcvtzs          v1.4s, v1.4s, #24
+        fcvtzs          v2.4s, v2.4s, #24
+        st1             {v0.4s, v1.4s}, [x0], #32
+        fcvtzs          v3.4s, v3.4s, #24
+        st1             {v2.4s, v3.4s}, [x0], #32
+        subs            w2, w2, #16
+        b.ne            1b
+        ret
+endfunc