maint: update copyright

[gnulib.git] / lib / fma.c

diff --git a/lib/fma.c b/lib/fma.c
index d804663..757bda9 100644 (file)
--- a/lib/fma.c
+++ b/lib/fma.c
@@ -1,5 +1,5 @@
 /* Fused multiply-add.
-   Copyright (C) 2007, 2009, 2011 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2009, 2011-2014 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -66,6 +66,19 @@
 #undef MIN
 #define MIN(a,b) ((a) < (b) ? (a) : (b))
 
+/* MSVC with option -fp:strict refuses to compile constant initializers that
+   contain floating-point operations.  Pacify this compiler.  */
+#ifdef _MSC_VER
+# pragma fenv_access (off)
+#endif
+
+/* Work around GCC 4.2.1 bug on OpenBSD 5.1/SPARC64.  */
+#if defined __GNUC__ && defined __sparc__
+# define VOLATILE volatile
+#else
+# define VOLATILE
+#endif
+
 /* It is possible to write an implementation of fused multiply-add with
    floating-point operations alone.  See
      Sylvie Boldo, Guillaume Melquiond:
@@ -860,16 +873,22 @@ FUNC (DOUBLE x, DOUBLE y, DOUBLE z)
                     else
                       {
                         /* First loop round.  */
-                        fsum = (DOUBLE)
-                               ((sum[sum_len - k - 1] << (GMP_LIMB_BITS - shift))
-                                | (sum_len >= k + 2 ? sum[sum_len - k - 2] >> shift : 0));
+                        {
+                          VOLATILE mp_limb_t chunk =
+                            (sum[sum_len - k - 1] << (GMP_LIMB_BITS - shift))
+                            | (sum_len >= k + 2 ? sum[sum_len - k - 2] >> shift : 0);
+                          fsum = (DOUBLE) chunk;
+                        }
                         /* General loop.  */
                         while (--k >= 0)
                           {
                             fsum *= chunk_multiplier;
-                            fsum += (DOUBLE)
-                                    ((sum[sum_len - k - 1] << (GMP_LIMB_BITS - shift))
-                                     | (sum[sum_len - k - 2] >> shift));
+                            {
+                              VOLATILE mp_limb_t chunk =
+                                (sum[sum_len - k - 1] << (GMP_LIMB_BITS - shift))
+                                | (sum[sum_len - k - 2] >> shift);
+                              fsum += (DOUBLE) chunk;
+                            }
                           }
                       }
                   }