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authorUlrich Drepper <drepper@redhat.com>2004-12-22 19:55:46 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 19:55:46 +0000
commitec8c29dc013a5e0ca3330ce5e4ae989e811491e6 (patch)
tree89ed45fb997421e63457013f492fa91e5b6abb6c /misc
parent3b7a95fb6b12e8184299378082831d52381a189b (diff)
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(FLOAT_MIN_10_EXP, FLOAT_MIN_10_NORM): Define. (ecvt_r): Special case denormals.
Diffstat (limited to 'misc')
-rw-r--r--misc/efgcvt_r.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/misc/efgcvt_r.c b/misc/efgcvt_r.c
index ac2a5c45bf..69cca9038f 100644
--- a/misc/efgcvt_r.c
+++ b/misc/efgcvt_r.c
@@ -1,5 +1,5 @@
 /* Compatibility functions for floating point formatting, reentrant versions.
-   Copyright (C) 1995,96,97,98,99,2000,01,02 Free Software Foundation, Inc.
+   Copyright (C) 1995,96,97,98,99,2000,01,02,04 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -31,6 +31,7 @@
 # define FUNC_PREFIX
 # define FLOAT_FMT_FLAG
 # define FLOAT_NAME_EXT
+# define FLOAT_MIN_10_EXP DBL_MIN_10_EXP
 # if DBL_MANT_DIG == 53
 #  define NDIGIT_MAX 17
 # elif DBL_MANT_DIG == 24
@@ -43,6 +44,17 @@
 #  error "NDIGIT_MAX must be precomputed"
 #  define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * DBL_MANT_DIG + 1.0)))
 # endif
+# if DBL_MIN_10_EXP == -37
+#  define FLOAT_MIN_10_NORM	1.0e-37
+# elif DBL_MIN_10_EXP == -307
+#  define FLOAT_MIN_10_NORM	1.0e-307
+# elif DBL_MIN_10_EXP == -4931
+#  define FLOAT_MIN_10_NORM	1.0e-4931
+# else
+/* libc can't depend on libm.  */
+#  error "FLOAT_MIN_10_NORM must be precomputed"
+#  define FLOAT_MIN_10_NORM	exp10 (DBL_MIN_10_EXP)
+# endif
 #endif
 
 #define APPEND(a, b) APPEND2 (a, b)
@@ -171,6 +183,17 @@ APPEND (FUNC_PREFIX, ecvt_r) (value, ndigit, decpt, sign, buf, len)
 	d = -value;
       else
 	d = value;
+      /* For denormalized numbers the d < 1.0 case below won't work,
+	 as f can overflow to +Inf.  */
+      if (d < FLOAT_MIN_10_NORM)
+	{
+	  value /= FLOAT_MIN_10_NORM;
+	  if (value < 0.0)
+	    d = -value;
+	  else
+	    d = value;
+	  exponent += FLOAT_MIN_10_EXP;
+	}
       if (d < 1.0)
 	{
 	  do