Add cpu features detection.

1 files changed, 109 insertions, 0 deletions

diff --git a/src/utils/cpu.cpp b/src/utils/cpu.cpp
new file mode 100644
index 000000000..bef0d653d
--- /dev/null
+++ b/src/utils/cpu.cpp
@@ -0,0 +1,109 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2013  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  This program 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
+ *  any later version.
+ *
+ *  This program 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "utils/cpu.h"
+
+#include "logger.h"
+
+#include "utils/stringutils.h"
+
+#include "resources/resourcemanager.h"
+
+#include "debug.h"
+
+int mCpuFlags = 0;
+
+void Cpu::detect()
+{
+#ifdef __GNUC__
+    __builtin_cpu_init();
+    if (__builtin_cpu_supports ("mmx"))
+        mCpuFlags |= FEATURE_MMX;
+    if (__builtin_cpu_supports ("sse"))
+        mCpuFlags |= FEATURE_SSE;
+    if (__builtin_cpu_supports ("sse2"))
+        mCpuFlags |= FEATURE_SSE2;
+    if (__builtin_cpu_supports ("ssse3"))
+        mCpuFlags |= FEATURE_SSSE3;
+    if (__builtin_cpu_supports ("sse4.1"))
+        mCpuFlags |= FEATURE_SSE4;
+    if (__builtin_cpu_supports ("sse4.2"))
+        mCpuFlags |= FEATURE_SSE42;
+    printFlags();
+#elif defined(__linux__) || defined(__linux)
+    FILE *file = fopen("/proc/cpuinfo", "r");
+    char buf[1001];
+    if (!file)
+        return;
+    while (fgets(buf, 1000, file))
+    {
+        std::string str = buf;
+        if (findFirst(str, "flags"))
+        {
+            size_t idx = str.find(":");
+            if (idx == std::string::npos)
+                continue;
+            str = str.substr(idx + 1);
+            trim(str);
+            StringVect vect;
+            splitToStringVector(vect, str, ' ');
+            FOR_EACH (StringVectCIter, it, vect)
+            {
+                const std::string &flag = *it;
+                if (flag == "mmx")
+                    mCpuFlags |= FEATURE_MMX;
+                else if (flag == "sse")
+                    mCpuFlags |= FEATURE_SSE;
+                else if (flag == "sse2")
+                    mCpuFlags |= FEATURE_SSE2;
+                else if (flag == "ssse3")
+                    mCpuFlags |= FEATURE_SSSE3;
+                else if (flag == "sse4_1")
+                    mCpuFlags |= FEATURE_SSE4;
+                else if (flag == "sse4_2")
+                    mCpuFlags |= FEATURE_SSE42;
+            }
+            fclose(file);
+            printFlags();
+            return;
+        }
+    }
+    fclose(file);
+    logger->log("cpu features was not detected");
+#endif
+}
+
+void Cpu::printFlags()
+{
+    std::string str = "CPU features:";
+    if (mCpuFlags & FEATURE_MMX)
+        str.append(" mmx");
+    if (mCpuFlags & FEATURE_SSE)
+        str.append(" sse");
+    if (mCpuFlags & FEATURE_SSE2)
+        str.append(" sse2");
+    if (mCpuFlags & FEATURE_SSSE3)
+        str.append(" ssse3");
+    if (mCpuFlags & FEATURE_SSE4)
+        str.append(" sse4");
+    if (mCpuFlags & FEATURE_SSE42)
+        str.append(" sse4_2");
+    logger->log(str);
+}