x86: dcadsp: implement int8x8_fmul_int32

For the callable function (as opposed to the inline one):
         C  SSE  SSE2  SSE4
Win32:  47   42   29    26
Win64:  30   33   25    23
The SSE version is neither compiled nor set for ARCH_X86_64, as the
inlinable function takes over.

Signed-off-by: Janne Grunau <janne-libav@jannau.net>

1 files changed, 52 insertions, 0 deletions

diff --git a/libavcodec/x86/dca.h b/libavcodec/x86/dca.h
new file mode 100644
index 0000000000..c14e94f4aa
--- /dev/null
+++ b/libavcodec/x86/dca.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2012-2014 Christophe Gisquet <christophe.gisquet@gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#if ARCH_X86_64
+# include "libavutil/x86/asm.h"
+# include "libavutil/mem.h"
+
+# define int8x8_fmul_int32 int8x8_fmul_int32
+static inline void int8x8_fmul_int32(av_unused DCADSPContext *dsp,
+                                     float *dst, const int8_t *src, int scale)
+{
+    DECLARE_ALIGNED(16, static const uint32_t, inverse16) = 0x3D800000;
+    __asm__ volatile (
+        "cvtsi2ss        %2, %%xmm0 \n\t"
+        "mulss           %3, %%xmm0 \n\t"
+        "movq          (%1), %%xmm1 \n\t"
+        "punpcklbw   %%xmm1, %%xmm1 \n\t"
+        "movaps      %%xmm1, %%xmm2 \n\t"
+        "punpcklwd   %%xmm1, %%xmm1 \n\t"
+        "punpckhwd   %%xmm2, %%xmm2 \n\t"
+        "psrad          $24, %%xmm1 \n\t"
+        "psrad          $24, %%xmm2 \n\t"
+        "shufps  $0, %%xmm0, %%xmm0 \n\t"
+        "cvtdq2ps    %%xmm1, %%xmm1 \n\t"
+        "cvtdq2ps    %%xmm2, %%xmm2 \n\t"
+        "mulps       %%xmm0, %%xmm1 \n\t"
+        "mulps       %%xmm0, %%xmm2 \n\t"
+        "movaps      %%xmm1,  0(%0) \n\t"
+        "movaps      %%xmm2, 16(%0) \n\t"
+        :: "r"(dst), "r"(src), "m"(scale), "m"(inverse16)
+        XMM_CLOBBERS_ONLY("xmm0", "xmm1", "xmm2")
+    );
+}
+
+#endif /* ARCH_X86_64 */