Merge remote repo native into ext/native/.

ext/native/math/math_util.cpp

@@ -0,0 +1,51 @@
+#include "math/math_util.h"
+#include <stdlib.h>
+#ifdef __SYMBIAN32__
+#include <e32std.h>
+#endif
+
+// QNX can only use RunFast mode and it is already the default.
+#if defined(__ARM_ARCH_7A__) && !defined(BLACKBERRY) && !defined(__SYMBIAN32__)
+// Enables 'RunFast' VFP mode.
+void EnableFZ() {
+	int x;
+	asm(
+		"fmrx %[result],FPSCR \r\n"
+		"orr %[result],%[result],#16777216 \r\n"
+		"fmxr FPSCR,%[result]"
+		:[result] "=r" (x) : :
+	);
+	//printf("ARM FPSCR: %08x\n",x);
+}
+
+// New fastmode code from: http://pandorawiki.org/Floating_Point_Optimization
+// These settings turbocharge the slow VFP unit on Cortex-A8 based chips by setting
+// restrictions that permit running VFP instructions on the NEON unit.
+// Denormal flush-to-zero, for example.
+void FPU_SetFastMode() {
+	static const unsigned int x = 0x04086060;
+	static const unsigned int y = 0x03000000;
+	int r;
+	asm volatile (
+		"fmrx	%0, fpscr			\n\t"	//r0 = FPSCR
+		"and	%0, %0, %1			\n\t"	//r0 = r0 & 0x04086060
+		"orr	%0, %0, %2			\n\t"	//r0 = r0 | 0x03000000
+		"fmxr	fpscr, %0			\n\t"	//FPSCR = r0
+		: "=r"(r)
+		: "r"(x), "r"(y)
+		);
+}
+
+#else
+
+void EnableFZ() {
+#ifdef __SYMBIAN32__
+	// Set RunFast hardware mode for Symbian VFPv2.
+	User::SetFloatingPointMode(EFpModeRunFast);
+#endif
+	// TODO
+}
+
+void FPU_SetFastMode() {}
+
+#endif