# HG changeset patch
# User John W. Eaton <jwe@octave.org>
# Date 1292829544 18000
# Node ID 57868a21170e8875e6d9a5b800214d7f6153f3d9
# Parent  7b563cf94d8d004a8efad4785c843c4040c75743
lo-mappers.h (xrem, xmod): prevent use of extra precision

diff --git a/liboctave/ChangeLog b/liboctave/ChangeLog
--- a/liboctave/ChangeLog
+++ b/liboctave/ChangeLog
@@ -1,3 +1,8 @@
+2010-12-20  John W. Eaton  <jwe@octave.org>
+
+	* lo-mappers.h (xrem, xmod): Declare temporary result from
+	multiplication volatile.
+
 2010-12-15  John W. Eaton  <jwe@octave.org>
 
 	Bug #31883.
diff --git a/liboctave/lo-mappers.h b/liboctave/lo-mappers.h
--- a/liboctave/lo-mappers.h
+++ b/liboctave/lo-mappers.h
@@ -341,7 +341,10 @@
             }
         }
 
-      retval = x - y * n;
+      // Prevent use of extra precision.
+      volatile T tmp = y * n;
+
+      retval = x - tmp;
     }
 
   if (x != y && y != 0 && retval != 0)
@@ -386,7 +389,10 @@
             }
         }
 
-      retval = x - y * n;
+      // Prevent use of extra precision.
+      volatile T tmp = y * n;
+
+      retval = x - tmp;
     }
 
   if (x != y && y != 0 && retval != 0)