floatformat.h (struct floatformat): Add split_half field.

include:
2007-11-07  Joseph Myers  <joseph@codesourcery.com>
	    Daniel Jacobowitz  <dan@codesourcery.com>

	* floatformat.h (struct floatformat): Add split_half field.
	(floatformat_ibm_long_double): New.

libiberty:
2007-11-07  Joseph Myers  <joseph@codesourcery.com>
	    Daniel Jacobowitz  <dan@codesourcery.com>

	* floatformat.c (mant_bits_set): New.
	(floatformat_to_double): Use it.  Note no special handling of
	split formats.
	(floatformat_from_double): Note no special handing of split
	formats.
	(floatformat_ibm_long_double_is_valid,
	floatformat_ibm_long_double): New.
	(floatformat_ieee_single_big, floatformat_ieee_single_little,
	floatformat_ieee_double_big, floatformat_ieee_double_little,
	floatformat_ieee_double_littlebyte_bigword, floatformat_vax_f,
	floatformat_vax_d, floatformat_vax_g, floatformat_i387_ext,
	floatformat_m68881_ext, floatformat_i960_ext,
	floatformat_m88110_ext, floatformat_m88110_harris_ext,
	floatformat_arm_ext_big, floatformat_arm_ext_littlebyte_bigword,
	floatformat_ia64_spill_big, floatformat_ia64_spill_little,
	floatformat_ia64_quad_big, floatformat_ia64_quad_little): Update
	for addition of split_half field.

Co-Authored-By: Daniel Jacobowitz <dan@codesourcery.com>

From-SVN: r129977

include/ChangeLog

+2007-11-07  Joseph Myers  <joseph@codesourcery.com>
+	    Daniel Jacobowitz  <dan@codesourcery.com>
+
+	* floatformat.h (struct floatformat): Add split_half field.
+	(floatformat_ibm_long_double): New.
+
 2007-09-06  Tom Tromey  <tromey@redhat.com>
 
 	* libiberty.h (pex_free): Document process killing.

include/floatformat.h

@@ -85,6 +85,13 @@ struct floatformat
 
   /* Validator method.  */
   int (*is_valid) (const struct floatformat *fmt, const void *from);
+
+  /* Is the format actually the sum of two smaller floating point
+     formats (IBM long double, as described in
+     gcc/config/rs6000/darwin-ldouble-format)?  If so, this is the
+     smaller format in question, and the fields sign_start through
+     intbit describe the first half.  If not, this is NULL.  */
+  const struct floatformat *split_half;
 };
 
 /* floatformats for IEEE single and double, big and little endian.  */
@@ -118,6 +125,8 @@ extern const struct floatformat floatformat_ia64_spill_big;
 extern const struct floatformat floatformat_ia64_spill_little;
 extern const struct floatformat floatformat_ia64_quad_big;
 extern const struct floatformat floatformat_ia64_quad_little;
+/* IBM long double (double+double).  */
+extern const struct floatformat floatformat_ibm_long_double;
 
 /* Convert from FMT to a double.
    FROM is the address of the extended float.

libiberty/ChangeLog

+2007-11-07  Joseph Myers  <joseph@codesourcery.com>
+	    Daniel Jacobowitz  <dan@codesourcery.com>
+
+	* floatformat.c (mant_bits_set): New.
+	(floatformat_to_double): Use it.  Note no special handling of
+	split formats.
+	(floatformat_from_double): Note no special handing of split
+	formats.
+	(floatformat_ibm_long_double_is_valid,
+	floatformat_ibm_long_double): New.
+	(floatformat_ieee_single_big, floatformat_ieee_single_little,
+	floatformat_ieee_double_big, floatformat_ieee_double_little,
+	floatformat_ieee_double_littlebyte_bigword, floatformat_vax_f,
+	floatformat_vax_d, floatformat_vax_g, floatformat_i387_ext,
+	floatformat_m68881_ext, floatformat_i960_ext,
+	floatformat_m88110_ext, floatformat_m88110_harris_ext,
+	floatformat_arm_ext_big, floatformat_arm_ext_littlebyte_bigword,
+	floatformat_ia64_spill_big, floatformat_ia64_spill_little,
+	floatformat_ia64_quad_big, floatformat_ia64_quad_little): Update
+	for addition of split_half field.
+
 2007-09-06  Tom Tromey  <tromey@redhat.com>
 
 	* pexecute.txh (pex_free): Document process killing.