Merge pull request #52 from jibsen/fix-platform-msvc

Fix preprocessor check for inline asm.

With MSVC inline asm is only available when compiling for x86. WIN32 is defined for all of x86, x64, and ARM. This checks for MSVC and x86 instead.

See
https://docs.microsoft.com/en-us/cpp/assembler/inline/inline-assembler
https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros

src/platform.cpp

@@ -64,7 +64,7 @@ static inline unsigned long read_time(void)
 	asm volatile("mftb %0" : "=r" (a));
 	return a;
 }
-#  elif defined(WIN32)
+#  elif defined(_MSC_VER) && defined(_M_IX86)
 static unsigned __int64 read_time(void)
 {
 	unsigned l, h;