os.h: cleanup the _MSC_VER cpp checks mess.

diff --git a/lib/os.h b/lib/os.h
index e589a33..6ac6771 100644 (file)
--- a/lib/os.h
+++ b/lib/os.h
@@ -119,8 +119,7 @@ static inline int vorbis_ftoi(double f){  /* yes, double!  Otherwise,
 
 /* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the
  * 64 bit compiler and doesn't work on arm. */
-#if defined(_MSC_VER) && !defined(_WIN64) && \
-      !defined(_WIN32_WCE) && !defined(_M_ARM) && !defined(_M_ARM64)
+#if defined(_MSC_VER) && defined(_M_IX86) && !defined(_WIN32_WCE)
 #  define VORBIS_FPU_CONTROL
 
 typedef ogg_int16_t vorbis_fpu_control;
@@ -147,7 +146,7 @@ static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
 
 /* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be
    done safely because all x86_64 CPUs supports SSE2. */
-#if (defined(_MSC_VER) && defined(_WIN64)) || (defined(__GNUC__) && defined (__SSE2_MATH__))
+#if (defined(_MSC_VER) && defined(_M_X64)) || (defined(__GNUC__) && defined (__SSE2_MATH__))
 #  define VORBIS_FPU_CONTROL
 
 typedef ogg_int16_t vorbis_fpu_control;