i386 arch lacks registers to support some tfm assembly, detect and disable

IDE/XCODE/README.md

@@ -54,6 +54,13 @@ device build. Both are debug builds.
 
 You can make an archive for a device, as well. That is a release build.
 
+## Known issues:
+
+When building for older iPhone models that support the i386 architecture some
+inline assembly in the fast math library assumes 64-bit registers and must be
+disabled. This inline assembly can be disabled with `#define TFM_NO_ASM` when
+using the setting `#define USE_FAST_MATH` on i386 targets.
+
 # Installing libwolfssl.a
 
 Simply drag the file libwolfssl_XXX_.a and the directory `include` and drop it into

IDE/XCODE/user_settings.h

@@ -18,6 +18,9 @@
 
     /* fast math */
     #define USE_FAST_MATH
+    #ifdef __i386__
+        #define TFM_NO_ASM
+    #endif
     #define HAVE_ECC
 
     /* ECC speedups */