From: Richard Stallman <rms@gnu.org>
Date: Sat, 19 Sep 1992 19:00:40 +0000 (+0000)
Subject: (fold_convert): Avoid using conversion of unsigned
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b6b19f41c6f312715ed7d64f5ce1e9b22ca5092b;p=gcc.git

(fold_convert): Avoid using conversion of unsigned
to floating; offset value by hand to fit in signed type.

From-SVN: r2165
---

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 126aac45677..f2aa59fd57d 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -1517,7 +1517,13 @@ fold_convert (t, arg1)
 
 	    high = (HOST_WIDE_INT) (d / half_word / half_word);
 	    d -= (REAL_VALUE_TYPE) high * half_word * half_word;
-	    low = (unsigned HOST_WIDE_INT) d;
+	    if (d >= (REAL_VALUE_TYPE) half_word * half_word / 2)
+	      {
+		low = d - (REAL_VALUE_TYPE) half_word * half_word / 2;
+		low |= 1 << (HOST_BITS_PER_WIDE_INT - 1);
+	      }
+	    else
+	      low = (HOST_WIDE_INT) d;
 	    if (TREE_REAL_CST (arg1) < 0)
 	      neg_double (low, high, &low, &high);
 	    t = build_int_2 (low, high);