Possible fix for the rdtsc call in JitIL.cpp on macosx (issue 3531). This also fixes issue 3595 (although that issue was invalid -- we don't suport scons on linux anymore).

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6498 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/Core/Src/PowerPC/Jit64IL/JitIL.cpp

@@ -165,16 +165,22 @@ ps_adds1
 #include <stdint.h>
 static inline uint64_t __rdtsc()
 {
-#ifdef __linux__
 	uint32_t lo, hi;
+#ifdef _LP64
 	__asm__ __volatile__ ("xorl %%eax,%%eax \n cpuid"
 			::: "%rax", "%rbx", "%rcx", "%rdx");
 	__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
 	return (uint64_t)hi << 32 | lo;
 #else
-	// TODO: Figure out what is wrong with clobbering the rbx register on OSX
-	return 0;
+	__asm__ __volatile__ (
+			"xor	%%eax,%%eax;"
+			"push	%%ebx;"
+			"cpuid;"
+			"pop	%%ebx;"
+			::: "%eax", "%ecx", "%edx");
+	__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
 #endif
+	return (uint64_t)hi << 32 | lo;
 }
 #endif