decompress_common.h: Optimize bitstream_ensure_bits()

[wimlib] / include / wimlib / compiler.h

diff --git a/include/wimlib/compiler.h b/include/wimlib/compiler.h
index c6e22e98d649d5cb42937eabdaf52472fb8af408..fd8942f15bf025bec6aa5485fcfadc07402d2096 100644 (file)
--- a/include/wimlib/compiler.h
+++ b/include/wimlib/compiler.h
@@ -30,6 +30,7 @@
 #      define unlikely(x) __builtin_expect(!!(x), 0)
 #      define inline inline __attribute__((always_inline))
 #      define prefetch(x) __builtin_prefetch(x)
+#      define is_constant(x) __builtin_constant_p(x)
 #else
 #      define WIMLIBAPI
 #      define _always_inline_attribute inline
@@ -42,6 +43,7 @@
 #      define likely(x) (x)
 #      define unlikely(x) (x)
 #      define prefetch(x)
+#      define is_constant(x) (0)
 #endif /* __GNUC__ */
 
 #endif /* _WIMLIB_COMPILER_H */