Define bit width of NUM type in one place.

* lib.h (NUM_BIT): New preprocessor symbol.

* arith.c (CNUM_BIT): Preprocessor symbol removed; this
same quantity is already known as PTR_BIT in lib.h.
(mul, square): Replace CNUM_BIT with PTR_BIT.
(comp_trunc, logtrunc, sign_extend, ash): Replace
num_bits with NUM_BIT.

* struct.c (struct_inst): Replace calculation with NUM_BIT.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib.h b/lib.h
index 2cfb714a..f4e24ca6 100644
--- a/lib.h
+++ b/lib.h
@@ -62,6 +62,7 @@ typedef double_uintptr_t dbl_ucnum;
 #define NUM_MIN (INT_PTR_MIN/4)
 
 #define PTR_BIT (SIZEOF_PTR * CHAR_BIT)
+#define NUM_BIT (PTR_BIT - TAG_SHIFT)
 
 #ifdef __GNUC__
 #define NORETURN __attribute__((noreturn))