add system-specific AllocateAligned call (because _mm_malloc isnt as portable as hoped)

("RTL" directly has been added to sysdep - requires update of workspace)

This was SVN commit r6156.

build/premake/premake.lua

@@ -431,6 +431,8 @@ function setup_all_libs ()
 		"cryptopp",
 		"valgrind"
 	}
+
+	-- OS-specific
 	sysdep_dirs = {
 		linux = { "lib/sysdep/linux", "lib/sysdep/unix", "lib/sysdep/unix/x" },
 		-- note: RC file must be added to main_exe package.
@@ -441,7 +443,14 @@ function setup_all_libs ()
 	for i,v in sysdep_dirs[OS] do
 		tinsert(source_dirs, v);
 	end
-	-- tinsert(source_dirs, sysdep_dirs[OS]);
+
+	-- runtime-library-specific
+	if target == "gnu" then
+		tinsert(source_dirs, "lib/sysdep/rtl/gcc");
+	else
+		tinsert(source_dirs, "lib/sysdep/rtl/msc");
+	end
+
 	setup_static_lib_package("lowlevel", source_dirs, extern_libs, {})
 end
 

source/lib/allocators/aligned_allocator.h

@@ -13,6 +13,7 @@
 
 #include "lib/bits.h"	// round_up
 #include "lib/sysdep/x86_x64/x86_x64.h"	// x86_x64_L1CacheLineSize
+#include "lib/sysdep/rtl.h"	// rtl_AllocateAligned
 
 
 /**
@@ -93,7 +94,7 @@ public:
 		const size_type alignment = x86_x64_L1CacheLineSize();
 		const size_type elementSize = round_up(sizeof(T), alignment);
 		const size_type size = numElements * elementSize;
-		pointer p = (pointer)_mm_malloc(size, alignment);
+		pointer p = (pointer)rtl_AllocateAligned(size, alignment);
 		return p;
 	}
 

source/lib/sysdep/rtl.h

@@ -0,0 +1,17 @@
+/**
+ * =========================================================================
+ * File        : rtl.h
+ * Project     : 0 A.D.
+ * Description : functions specific to the toolset's runtime library
+ * =========================================================================
+ */
+
+// license: GPL; see lib/license.txt
+
+#ifndef INCLUDED_RTL
+#define INCLUDED_RTL
+
+LIB_API void* rtl_AllocateAligned(size_t size, size_t alignment);
+LIB_API void rtl_FreeAligned(void* alignedPointer);
+
+#endif	// #ifndef INCLUDED_RTL

source/lib/sysdep/rtl/msc/msc.cpp

@@ -0,0 +1,12 @@
+#include "precompiled.h"
+#include "lib/sysdep/rtl.h"
+
+void* rtl_AllocateAligned(size_t size, size_t alignment)
+{
+	return _aligned_malloc(size, alignment);
+}
+
+void rtl_FreeAligned(void* alignedPointer)
+{
+	_aligned_free(alignedPointer);
+}