diff options
Diffstat (limited to 'gcc/c-cppbuiltin.c')
-rw-r--r-- | gcc/c-cppbuiltin.c | 54 |
1 files changed, 39 insertions, 15 deletions
diff --git a/gcc/c-cppbuiltin.c b/gcc/c-cppbuiltin.c index 6ce5588afe7..d46451066b1 100644 --- a/gcc/c-cppbuiltin.c +++ b/gcc/c-cppbuiltin.c @@ -1,5 +1,5 @@ /* Define builtin-in macros for the C family front ends. - Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. + Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. This file is part of GCC. @@ -51,10 +51,13 @@ static void builtin_define_with_value_n (const char *, const char *, static void builtin_define_with_int_value (const char *, HOST_WIDE_INT); static void builtin_define_with_hex_fp_value (const char *, tree, int, const char *, + const char *, const char *); static void builtin_define_type_max (const char *, tree, int); static void builtin_define_type_precision (const char *, tree); -static void builtin_define_float_constants (const char *, const char *, +static void builtin_define_float_constants (const char *, + const char *, + const char *, tree); static void define__GNUC__ (void); @@ -65,9 +68,13 @@ builtin_define_type_precision (const char *name, tree type) builtin_define_with_int_value (name, TYPE_PRECISION (type)); } -/* Define the float.h constants for TYPE using NAME_PREFIX and FP_SUFFIX. */ +/* Define the float.h constants for TYPE using NAME_PREFIX, FP_SUFFIX, + and FP_CAST. */ static void -builtin_define_float_constants (const char *name_prefix, const char *fp_suffix, tree type) +builtin_define_float_constants (const char *name_prefix, + const char *fp_suffix, + const char *fp_cast, + tree type) { /* Used to convert radix-based values to base 10 values in several cases. @@ -205,19 +212,19 @@ builtin_define_float_constants (const char *name_prefix, const char *fp_suffix, } } sprintf (name, "__%s_MAX__", name_prefix); - builtin_define_with_hex_fp_value (name, type, decimal_dig, buf, fp_suffix); + builtin_define_with_hex_fp_value (name, type, decimal_dig, buf, fp_suffix, fp_cast); /* The minimum normalized positive floating-point number, b**(emin-1). */ sprintf (name, "__%s_MIN__", name_prefix); sprintf (buf, "0x1p%d", (fmt->emin - 1) * fmt->log2_b); - builtin_define_with_hex_fp_value (name, type, decimal_dig, buf, fp_suffix); + builtin_define_with_hex_fp_value (name, type, decimal_dig, buf, fp_suffix, fp_cast); /* The difference between 1 and the least value greater than 1 that is representable in the given floating point type, b**(1-p). */ sprintf (name, "__%s_EPSILON__", name_prefix); sprintf (buf, "0x1p%d", (1 - fmt->p) * fmt->log2_b); - builtin_define_with_hex_fp_value (name, type, decimal_dig, buf, fp_suffix); + builtin_define_with_hex_fp_value (name, type, decimal_dig, buf, fp_suffix, fp_cast); /* For C++ std::numeric_limits<T>::denorm_min. The minimum denormalized positive floating-point number, b**(emin-p). Zero for formats that @@ -227,7 +234,7 @@ builtin_define_float_constants (const char *name_prefix, const char *fp_suffix, { sprintf (buf, "0x1p%d", (fmt->emin - fmt->p) * fmt->log2_b); builtin_define_with_hex_fp_value (name, type, decimal_dig, - buf, fp_suffix); + buf, fp_suffix, fp_cast); } else { @@ -235,6 +242,9 @@ builtin_define_float_constants (const char *name_prefix, const char *fp_suffix, builtin_define_with_value (name, buf, 0); } + sprintf (name, "__%s_HAS_DENORM__", name_prefix); + builtin_define_with_value (name, fmt->has_denorm ? "1" : "0", 0); + /* For C++ std::numeric_limits<T>::has_infinity. */ sprintf (name, "__%s_HAS_INFINITY__", name_prefix); builtin_define_with_int_value (name, @@ -357,9 +367,16 @@ c_cpp_builtins (cpp_reader *pfile) builtin_define_with_int_value ("__FLT_EVAL_METHOD__", TARGET_FLT_EVAL_METHOD); - builtin_define_float_constants ("FLT", "F", float_type_node); - builtin_define_float_constants ("DBL", "", double_type_node); - builtin_define_float_constants ("LDBL", "L", long_double_type_node); + builtin_define_float_constants ("FLT", "F", "%s", float_type_node); + /* Cast the double precision constants when single precision constants are + specified. The correct result is computed by the compiler when using + macros that include a cast. This has the side-effect of making the value + unusable in const expressions. */ + if (flag_single_precision_constant) + builtin_define_float_constants ("DBL", "L", "((double)%s)", double_type_node); + else + builtin_define_float_constants ("DBL", "", "%s", double_type_node); + builtin_define_float_constants ("LDBL", "L", "%s", long_double_type_node); /* For use in assembly language. */ builtin_define_with_value ("__REGISTER_PREFIX__", REGISTER_PREFIX, 0); @@ -535,10 +552,12 @@ builtin_define_with_int_value (const char *macro, HOST_WIDE_INT value) static void builtin_define_with_hex_fp_value (const char *macro, tree type ATTRIBUTE_UNUSED, int digits, - const char *hex_str, const char *fp_suffix) + const char *hex_str, + const char *fp_suffix, + const char *fp_cast) { REAL_VALUE_TYPE real; - char dec_str[64], buf[256]; + char dec_str[64], buf1[256], buf2[256]; /* Hex values are really cool and convenient, except that they're not supported in strict ISO C90 mode. First, the "p-" sequence @@ -553,8 +572,13 @@ builtin_define_with_hex_fp_value (const char *macro, real_from_string (&real, hex_str); real_to_decimal (dec_str, &real, sizeof (dec_str), digits, 0); - sprintf (buf, "%s=%s%s", macro, dec_str, fp_suffix); - cpp_define (parse_in, buf); + /* Assemble the macro in the following fashion + macro = fp_cast [dec_str fp_suffix] */ + sprintf (buf1, "%s%s", dec_str, fp_suffix); + sprintf (buf2, fp_cast, buf1); + sprintf (buf1, "%s=%s", macro, buf2); + + cpp_define (parse_in, buf1); } /* Define MAX for TYPE based on the precision of the type. IS_LONG is |