1 files changed, 75 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/ppc/check_altivec.c b/contrib/ffmpeg/libavcodec/ppc/check_altivec.c
new file mode 100644
index 000000000..cf55b9a1d
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/ppc/check_altivec.c
@@ -0,0 +1,75 @@
+/*
+ * 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
+ */
+
+
+/**
+ * @file check_altivec.c
+ * Checks for AltiVec presence.
+ */
+
+#ifdef __APPLE__
+#include <sys/sysctl.h>
+#elif __AMIGAOS4__
+#include <exec/exec.h>
+#include <interfaces/exec.h>
+#include <proto/exec.h>
+#endif /* __APPLE__ */
+
+/**
+ * This function MAY rely on signal() or fork() in order to make sure altivec
+ * is present
+ */
+
+int has_altivec(void)
+{
+#ifdef __AMIGAOS4__
+    ULONG result = 0;
+    extern struct ExecIFace *IExec;
+
+    IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
+    if (result == VECTORTYPE_ALTIVEC) return 1;
+    return 0;
+#elif __APPLE__
+    int sels[2] = {CTL_HW, HW_VECTORUNIT};
+    int has_vu = 0;
+    size_t len = sizeof(has_vu);
+    int err;
+
+    err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
+
+    if (err == 0) return (has_vu != 0);
+    return 0;
+#elif defined(RUNTIME_CPUDETECT)
+    int proc_ver;
+    // support of mfspr PVR emulation added in Linux 2.6.17
+    asm volatile("mfspr %0, 287" : "=r" (proc_ver));
+    proc_ver >>= 16;
+    if (proc_ver  & 0x8000 ||
+        proc_ver == 0x000c ||
+        proc_ver == 0x0039 || proc_ver == 0x003c ||
+        proc_ver == 0x0044 || proc_ver == 0x0045 ||
+        proc_ver == 0x0070)
+        return 1;
+    return 0;
+#else
+    // since we were compiled for altivec, just assume we have it
+    // until someone comes up with a proper way (not involving signal hacks).
+    return 1;
+#endif /* __AMIGAOS4__ */
+}
+