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[patch] stdint.h: [u]int_fast<N>_t types (Take 2)
- From: Ralf Corsepius <ralf dot corsepius at rtems dot org>
- To: Newlib List <newlib at sources dot redhat dot com>
- Date: Wed, 05 Oct 2005 04:46:28 +0200
- Subject: [patch] stdint.h: [u]int_fast<N>_t types (Take 2)
Hi again,
Take 2 at implementing [u]int_fast<N>_t types:
* Working principle: Assume "int" to be the fastest type for all fixed
size types with a size less than int.
=> Use "[signed|unsigned] int" for [u]int_fast<N>_t with N <= N(int).
=> Use "[u]int_least<N>_t" for [u]int_fast<N>_t with N > N(int).
Ralf
2005-10-05 Ralf Corsepius <ralf.corsepius@rtems.org>
* libc/include/stdint.h: Add [u]int_fast<N>_t types.
Index: stdint.h
===================================================================
RCS file: /cvs/src/src/newlib/libc/include/stdint.h,v
retrieving revision 1.6
diff -u -r1.6 stdint.h
--- stdint.h 4 Oct 2005 21:02:59 -0000 1.6
+++ stdint.h 5 Oct 2005 02:35:24 -0000
@@ -154,6 +154,73 @@
#endif
#endif
+/*
+ * Fastest minimum-width integer types
+ *
+ * Assume int to be the fastest type for all types with a width
+ * less than __INT_MAX__ rsp. INT_MAX
+ */
+#if __STDINT_EXP(INT_MAX) >= 0x7f
+ typedef signed int int_fast8_t;
+ typedef unsigned int uint_fast8_t;
+#define __int_fast8_t_defined 1
+#endif
+
+#if __STDINT_EXP(INT_MAX) >= 0x7fff
+ typedef signed int int_fast16_t;
+ typedef unsigned int uint_fast16_t;
+#define __int_fast16_t_defined 1
+#endif
+
+#if __STDINT_EXP(INT_MAX) >= 0x7fffffff
+ typedef signed int int_fast32_t;
+ typedef unsigned int uint_fast32_t;
+#define __int_fast32_t_defined 1
+#endif
+
+#if __STDINT_EXP(INT_MAX) > 0x7fffffff
+ typedef signed int int_fast64_t;
+ typedef unsigned int uint_fast64_t;
+#define __int_fast64_t_defined 1
+#endif
+
+/*
+ * Fall back to [u]int_least<N>_t for [u]int_fast<N>_t types
+ * not having been defined, yet.
+ * Leave undefined, if [u]int_least<N>_t should not be available.
+ */
+#if !__int_fast8_t_defined
+#if __int_least8_t_defined
+ typedef int_least8_t int_fast8_t;
+ typedef uint_least8_t uint_fast8_t;
+#define __int_fast8_t_defined 1
+#endif
+#endif
+
+#if !__int_fast16_t_defined
+#if __int_least16_t_defined
+ typedef int_least16_t int_fast16_t;
+ typedef uint_least16_t uint_fast16_t;
+#define __int_fast16_t_defined 1
+#endif
+#endif
+
+#if !__int_fast32_t_defined
+#if __int_least32_t_defined
+ typedef int_least32_t int_fast32_t;
+ typedef uint_least32_t uint_fast32_t;
+#define __int_fast32_t_defined 1
+#endif
+#endif
+
+#if !__int_fast64_t_defined
+#if __int_least64_t_defined
+ typedef int_least64_t int_fast64_t;
+ typedef uint_least64_t uint_fast64_t;
+#define __int_fast64_t_defined 1
+#endif
+#endif
+
/* Greatest-width integer types */
/* Modern GCCs provide __INTMAX_TYPE__ */
#if defined(__INTMAX_TYPE__)
@@ -257,6 +324,30 @@
#endif
#endif
+#if __int_fast8_t_defined
+#define INT_FAST8_MIN INT8_MIN
+#define INT_FAST8_MAX INT8_MAX
+#define UINT_FAST8_MAX UINT8_MAX
+#endif
+
+#if __int_fast16_t_defined
+#define INT_FAST16_MIN INT16_MIN
+#define INT_FAST16_MAX INT16_MAX
+#define UINT_FAST16_MAX UINT16_MAX
+#endif
+
+#if __int_fast32_t_defined
+#define INT_FAST32_MIN INT32_MIN
+#define INT_FAST32_MAX INT32_MAX
+#define UINT_FAST32_MAX UINT32_MAX
+#endif
+
+#if __int_fast64_t_defined
+#define INT_FAST64_MIN INT64_MIN
+#define INT_FAST64_MAX INT64_MAX
+#define UINT_FAST64_MAX UINT64_MAX
+#endif
+
/* This must match size_t in stddef.h, currently long unsigned int */
#define SIZE_MIN (-__STDINT_EXP(LONG_MAX) - 1L)
#define SIZE_MAX __STDINT_EXP(LONG_MAX)