DCA: ARM/NEON optimised lfe_fir

Originally committed as revision 22863 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 61 insertions, 0 deletions

diff --git a/libavcodec/arm/dcadsp_neon.S b/libavcodec/arm/dcadsp_neon.S
new file mode 100644
index 0000000000..19960ab193
--- /dev/null
+++ b/libavcodec/arm/dcadsp_neon.S
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
+ *
+ * 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 "asm.S"
+
+function ff_dca_lfe_fir_neon, export=1
+        push            {r4-r6,lr}
+
+        add             r4,  r0,  r3,  lsl #2   @ out2
+        add             r5,  r2,  #256*4-16     @ cf1
+        sub             r1,  r1,  #12
+        cmp             r3,  #32
+        moveq           r6,  #256/32
+        movne           r6,  #256/64
+NOVFP   vldr            d0,  [sp, #16]          @ scale, bias
+        mov             lr,  #-16
+1:
+        vmov.f32        q2,  #0.0               @ v0
+        vmov.f32        q3,  #0.0               @ v1
+        mov             r12, r6
+2:
+        vld1.32         {q8},     [r2,:128]!    @ cf0
+        vld1.32         {q9},     [r5,:128], lr @ cf1
+        vld1.32         {q1},     [r1], lr      @ in
+        subs            r12, r12, #4
+        vrev64.32       q10, q8
+        vmla.f32        q3,  q1,  q9
+        vmla.f32        d4,  d2,  d21
+        vmla.f32        d5,  d3,  d20
+        bne             2b
+
+        add             r1,  r1,  r6,  lsl #2
+        subs            r3,  r3,  #1
+        vadd.f32        d4,  d4,  d5
+        vadd.f32        d6,  d6,  d7
+        vpadd.f32       d4,  d4,  d6
+        vdup.32         d5,  d0[1]
+        vmla.f32        d5,  d4,  d0[0]
+        vst1.32         {d5[0]},  [r0,:32]!
+        vst1.32         {d5[1]},  [r4,:32]!
+        bne             1b
+
+        pop             {r4-r6,pc}
+endfunc