From 4cda70a4681e9134828f33c70ffcf9cc4f69fa39 Mon Sep 17 00:00:00 2001
From: vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4>
Date: Thu, 6 Feb 2014 11:50:39 +0000
Subject: [src/set_ld.c] Added a note about the test for infinity.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@8921 280ebfd0-de03-0410-8827-d642c229c3f4
---
 src/set_ld.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/set_ld.c')

diff --git a/src/set_ld.c b/src/set_ld.c
index daa2182eb..013aa65fd 100644
--- a/src/set_ld.c
+++ b/src/set_ld.c
@@ -165,6 +165,10 @@ mpfr_set_ld (mpfr_ptr r, long double d, mpfr_rnd_t rnd_mode)
   LONGDOUBLE_NAN_ACTION (d, goto nan);
 
   /* Check for INF */
+  /* Note: according to the ISO C standard, there may be finite numbers
+     larger than LDBL_MAX, among the values that are not floating-point
+     numbers. If the following fails on some platform, a test d - d != 0
+     could be used. */
   if (d > MPFR_LDBL_MAX)
     {
       mpfr_set_inf (r, 1);
-- 
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