Daily bump.

[pf3gnuchains/gcc-fork.git] / gcc / real.c

diff --git a/gcc/real.c b/gcc/real.c
index 886f8b4..d26b0cb 100644 (file)
--- a/gcc/real.c
+++ b/gcc/real.c
@@ -1,6 +1,6 @@
 /* real.c - software floating point emulation.
-   Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-   2000, 2002, 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
+   Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
+   2003, 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
    Contributed by Stephen L. Moshier (moshier@world.std.com).
    Re-written by Richard Henderson <rth@redhat.com>
 
@@ -1266,6 +1266,35 @@ exact_real_inverse (enum machine_mode mode, REAL_VALUE_TYPE *r)
   *r = u;
   return true;
 }
+
+/* Return true if arithmetic on values in IMODE that were promoted
+   from values in TMODE is equivalent to direct arithmetic on values
+   in TMODE.  */
+
+bool
+real_can_shorten_arithmetic (enum machine_mode imode, enum machine_mode tmode)
+{
+  const struct real_format *tfmt, *ifmt;
+  tfmt = REAL_MODE_FORMAT (tmode);
+  ifmt = REAL_MODE_FORMAT (imode);
+  /* These conditions are conservative rather than trying to catch the
+     exact boundary conditions; the main case to allow is IEEE float
+     and double.  */
+  return (ifmt->b == tfmt->b
+         && ifmt->p > 2 * tfmt->p
+         && ifmt->emin < 2 * tfmt->emin - tfmt->p - 2
+         && ifmt->emin < tfmt->emin - tfmt->emax - tfmt->p - 2
+         && ifmt->emax > 2 * tfmt->emax + 2
+         && ifmt->emax > tfmt->emax - tfmt->emin + tfmt->p + 2
+         && ifmt->round_towards_zero == tfmt->round_towards_zero
+         && (ifmt->has_sign_dependent_rounding
+             == tfmt->has_sign_dependent_rounding)
+         && ifmt->has_nans >= tfmt->has_nans
+         && ifmt->has_inf >= tfmt->has_inf
+         && ifmt->has_signed_zero >= tfmt->has_signed_zero
+         && !MODE_COMPOSITE_P (tmode)
+         && !MODE_COMPOSITE_P (imode));
+}
 \f
 /* Render R as an integer.  */
 
@@ -2417,7 +2446,7 @@ real_maxval (REAL_VALUE_TYPE *r, int sign, enum machine_mode mode)
           required to be the value of the long double rounded to the
           nearest double.  Rounding means we need a slightly smaller
           value for LDBL_MAX.  */
-        clear_significand_bit (r, SIGNIFICAND_BITS - fmt->pnan);
+       clear_significand_bit (r, SIGNIFICAND_BITS - fmt->pnan - 1);
     }
 }
 
@@ -4418,8 +4447,8 @@ const struct real_format decimal_single_format =
     10, 
     7,
     7,
-    -95,
-    96,
+    -94,
+    97,
     31,
     31,
     false,
@@ -4440,8 +4469,8 @@ const struct real_format decimal_double_format =
     10,
     16,
     16,
-    -383,
-    384,
+    -382,
+    385,
     63,
     63,
     false,
@@ -4462,8 +4491,8 @@ const struct real_format decimal_quad_format =
     10,
     34,
     34,
-    -6143,
-    6144,
+    -6142,
+    6145,
     127,
     127,
     false,