Merge CV, ver=5.1; ops/methods from HV, and interface from CV where possible

[goodguy/history.git] / cinelerra-5.1 / mpeg2enc / cpu_accel.c

diff --git a/cinelerra-5.1/mpeg2enc/cpu_accel.c b/cinelerra-5.1/mpeg2enc/cpu_accel.c
new file mode 100644 (file)
index 0000000..f898d25
--- /dev/null
+++ b/cinelerra-5.1/mpeg2enc/cpu_accel.c
@@ -0,0 +1,106 @@
+/*
+ * cpu_accel.c
+ * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *
+ * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
+ *
+ * mpeg2dec 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.
+ *
+ * mpeg2dec 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+
+#include "cpu_accel.h"
+
+#ifdef X86_CPU
+static int x86_accel (void)
+{
+    int eax, ebx, ecx, edx;
+    int AMD;
+    int caps;
+
+#define cpuid(op,eax,ebx,ecx,edx)      \
+    asm ("cpuid"                       \
+        : "=a" (eax),                  \
+          "=b" (ebx),                  \
+          "=c" (ecx),                  \
+          "=d" (edx)                   \
+        : "a" (op)                     \
+        : "cc")
+
+    asm ("pushfl\n\t"
+        "popl %0\n\t"
+        "movl %0,%1\n\t"
+        "xorl $0x200000,%0\n\t"
+        "pushl %0\n\t"
+        "popfl\n\t"
+        "pushfl\n\t"
+        "popl %0"
+         : "=a" (eax),
+          "=b" (ebx)
+        :
+        : "cc");
+
+    if (eax == ebx)            // no cpuid
+       return 0;
+
+    cpuid (0x00000000, eax, ebx, ecx, edx);
+    if (!eax)                  // vendor string only
+       return 0;
+
+    AMD = (ebx == 0x68747541) && (ecx == 0x444d4163) && (edx == 0x69746e65);
+
+    cpuid (0x00000001, eax, ebx, ecx, edx);
+    if (! (edx & 0x00800000))  // no MMX
+       return 0;
+
+    caps = ACCEL_X86_MMX;
+    if (edx & 0x02000000)      // SSE - identical to AMD MMX extensions
+       caps = ACCEL_X86_MMX | ACCEL_X86_MMXEXT;
+
+    cpuid (0x80000000, eax, ebx, ecx, edx);
+    if (eax < 0x80000001)      // no extended capabilities
+       return caps;
+
+    cpuid (0x80000001, eax, ebx, ecx, edx);
+
+    if (edx & 0x80000000)
+       caps |= ACCEL_X86_3DNOW;
+
+    if (AMD && (edx & 0x00400000))     // AMD MMX extensions
+       {
+               caps |= ACCEL_X86_MMXEXT;
+       }
+
+    return caps;
+}
+#endif
+
+int cpu_accel (void)
+{
+#ifdef X86_CPU
+    static int got_accel = 0;
+    static int accel;
+
+    if (!got_accel) {
+       got_accel = 1;
+       accel = x86_accel ();
+    }
+
+    return accel;
+#else
+    return 0;
+#endif
+}