X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=pcsx_rearmed.git;a=blobdiff_plain;f=include%2Fcompiler_features.h;fp=include%2Fcompiler_features.h;h=753706d7fe2219a016e5761f6ef962877a6edc92;hp=3841866452ef6b9cd81071e440fb82c34ec1cfff;hb=a5cd72d0e598f037fd9d9f23948af5b2fb06e2eb;hpb=9165d434d935746da54484381ebbee754e899680

diff --git a/include/compiler_features.h b/include/compiler_features.h
index 38418664..753706d7 100644
--- a/include/compiler_features.h
+++ b/include/compiler_features.h
@@ -2,14 +2,28 @@
 #ifdef __GNUC__
 # define likely(x)       __builtin_expect((x),1)
 # define unlikely(x)     __builtin_expect((x),0)
-# define noinline        __attribute__((noinline))
+# ifdef __clang__
+#  define noinline       __attribute__((noinline))
+# else
+#  define noinline       __attribute__((noinline,noclone))
+# endif
+# define unused          __attribute__((unused))
 #else
 # define likely(x)       (x)
 # define unlikely(x)     (x)
 # define noinline
+# define unused
 #endif
 
 #ifndef __has_builtin
 #define __has_builtin(x) 0
 #endif
 
+#if __has_builtin(__builtin_add_overflow) || (defined(__GNUC__) && __GNUC__ >= 5)
+#define add_overflow(a, b, r) __builtin_add_overflow(a, b, &(r))
+#define sub_overflow(a, b, r) __builtin_sub_overflow(a, b, &(r))
+#else
+#define add_overflow(a, b, r) ({r = (u32)a + (u32)b; (a ^ ~b) & (a ^ r) & (1u<<31);})
+#define sub_overflow(a, b, r) ({r = (u32)a - (u32)b; (a ^  b) & (a ^ r) & (1u<<31);})
+#endif
+