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* tags.h (SCM_T_BITS_MAX, SCM_T_SIGNED_BITS_MAX,

Browse source 
SCM_T_SIGNED_BITS_MIN): New.
* numbers.h (SCM_MOST_POSITIVE_FIXNUM, SCM_MOST_NEGATIVE_FIXNUM):
Use them to make these macros computable by the preprocessor.
This commit is contained in:
Marius Vollmer 2001-10-06 19:58:02 +00:00
parent 152812c057
commit 004c0902ff
2 changed files with 9 additions and 7 deletions
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10
libguile/numbers.h
View file

@ -55,13 +55,9 @@
*
* Inums are exact integer data that fits within an SCM word. */
#define SCM_I_FIXNUM_BIT \
(SCM_LONG_BIT - 2)
#define SCM_MOST_POSITIVE_FIXNUM \
((((scm_t_signed_bits) 1) << (SCM_I_FIXNUM_BIT - 1)) - 1)
#define SCM_MOST_NEGATIVE_FIXNUM \
(-((scm_t_signed_bits) SCM_MOST_POSITIVE_FIXNUM) - 1)
#define SCM_I_FIXNUM_BIT (SCM_LONG_BIT - 2)
#define SCM_MOST_POSITIVE_FIXNUM (SCM_T_SIGNED_BITS_MAX/8-1)
#define SCM_MOST_NEGATIVE_FIXNUM (-SCM_MOST_POSITIVE_FIXNUM-1)
/* SCM_SRS is signed right shift */
#if (-1 == (((-1) << 2) + 2) >> 2)

6
libguile/tags.h
View file

@ -65,9 +65,15 @@
#ifdef HAVE_UINTPTR_T
typedef uintptr_t scm_t_bits;
typedef intptr_t scm_t_signed_bits;
#define SCM_T_BITS_MAX UINTPTR_MAX
#define SCM_T_SIGNED_BITS_MAX INTPTR_MAX
#define SCM_T_SIGNED_BITS_MIN INTPTR_MIN
#else
typedef unsigned long scm_t_bits;
typedef signed long scm_t_signed_bits;
#define SCM_T_BITS_MAX ULONG_MAX
#define SCM_T_SIGNED_BITS_MAX LONG_MAX
#define SCM_T_SIGNED_BITS_MIN LONG_MIN
#endif
/* But as external interface, we use SCM, which may, according to the desired