1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index ff23f12..18950ae 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -2139,6 +2139,12 @@ fold_convert_const_real_from_real (tree type, const_tree arg1)
       && REAL_VALUE_ISSIGNALING_NAN (TREE_REAL_CST (arg1)))
     return NULL_TREE; 
 
+  /* With flag_rounding_math we should respect the current rounding mode
+     unless the conversion is exact.  */
+  if (HONOR_SIGN_DEPENDENT_ROUNDING (arg1)
+      && !exact_real_truncate (TYPE_MODE (type), &TREE_REAL_CST (arg1)))
+    return NULL_TREE;
+
   real_convert (&value, TYPE_MODE (type), &TREE_REAL_CST (arg1));
   t = build_real (type, value);