Engine directory for ticket #1

Engine/source/platformX86UNIX/x86UNIXMath_ASM.cpp

@@ -0,0 +1,55 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+#include "math/mMath.h"
+
+static S32 m_mulDivS32_ASM(S32 a, S32 b, S32 c)
+{  // a * b / c
+   S32 r;
+   
+   __asm__ __volatile__(
+      "imul  %2\n"
+      "idiv  %3\n"
+      : "=a" (r) : "a" (a) , "b" (b) , "c" (c) 
+      );
+   return r;
+}   
+
+
+static U32 m_mulDivU32_ASM(S32 a, S32 b, U32 c)
+{  // a * b / c
+   S32 r;
+   __asm__ __volatile__(
+      "mov   $0, %%edx\n"
+      "mul   %2\n"
+      "div   %3\n"
+      : "=a" (r) : "a" (a) , "b" (b) , "c" (c) 
+      );
+   return r;
+}   
+
+//------------------------------------------------------------------------------
+void mInstallLibrary_ASM()
+{
+   m_mulDivS32              = m_mulDivS32_ASM;
+   m_mulDivU32              = m_mulDivU32_ASM;
+}