[PATCH 2/6] float128: Add conversion from float128 to mpn

["Gabriel F. T. Gomes" <gftg at linux dot vnet dot ibm dot com>]

Reuse the code for __mpn_extract_long_double to implement
__mpn_extract_float128.

2017-05-15  Gabriel F. T. Gomes  <gftg@linux.vnet.ibm.com>

	* include/gmp.h (__mpn_extract_float128): Declare when
	__HAVE_DISTINCT_FLOAT128 is 1.
	* misc/sys/param.h (MIN, MAX): Only define if not yet defined.
	* sysdeps/ieee754/float128/Makefile: New file.
	* sysdeps/ieee754/float128/float1282mpn.c: New file.
	* sysdeps/ieee754/ldbl-128/ldbl2mpn.c (__mpn_extract_float128): New
	function, which is built when __FLOAT128_OVERRIDE is defined.
---
 include/gmp.h                           |  6 ++++++
 misc/sys/param.h                        |  8 ++++++--
 sysdeps/ieee754/float128/Makefile       |  3 +++
 sysdeps/ieee754/float128/float1282mpn.c | 20 ++++++++++++++++++++
 sysdeps/ieee754/ldbl-128/ldbl2mpn.c     | 18 ++++++++++++++----
 5 files changed, 49 insertions(+), 6 deletions(-)
 create mode 100644 sysdeps/ieee754/float128/Makefile
 create mode 100644 sysdeps/ieee754/float128/float1282mpn.c

diff --git a/include/gmp.h b/include/gmp.h
index b741670..95d6c16 100644
--- a/include/gmp.h
+++ b/include/gmp.h
@@ -15,6 +15,12 @@ extern mp_size_t __mpn_extract_long_double (mp_ptr res_ptr, mp_size_t size,
 					    int *expt, int *is_neg,
 					    long double value);
 
+#if __HAVE_DISTINCT_FLOAT128
+extern mp_size_t __mpn_extract_float128 (mp_ptr res_ptr, mp_size_t size,
+					 int *expt, int *is_neg,
+					 _Float128 value);
+#endif
+
 extern float __mpn_construct_float (mp_srcptr frac_ptr, int expt, int sign);
 
 extern double __mpn_construct_double (mp_srcptr frac_ptr, int expt,
diff --git a/misc/sys/param.h b/misc/sys/param.h
index 9721613..02d6b1c 100644
--- a/misc/sys/param.h
+++ b/misc/sys/param.h
@@ -99,8 +99,12 @@
 #define powerof2(x)     ((((x) - 1) & (x)) == 0)
 
 /* Macros for min/max.  */
-#define MIN(a,b) (((a)<(b))?(a):(b))
-#define MAX(a,b) (((a)>(b))?(a):(b))
+#ifndef MIN
+# define MIN(a,b) (((a)<(b))?(a):(b))
+#endif
+#ifndef MAX
+# define MAX(a,b) (((a)>(b))?(a):(b))
+#endif
 
 
 #endif  /* sys/param.h */
diff --git a/sysdeps/ieee754/float128/Makefile b/sysdeps/ieee754/float128/Makefile
new file mode 100644
index 0000000..6a7b0e0
--- /dev/null
+++ b/sysdeps/ieee754/float128/Makefile
@@ -0,0 +1,3 @@
+ifeq ($(subdir),stdlib)
+routines += float1282mpn
+endif
diff --git a/sysdeps/ieee754/float128/float1282mpn.c b/sysdeps/ieee754/float128/float1282mpn.c
new file mode 100644
index 0000000..b0dd2e9
--- /dev/null
+++ b/sysdeps/ieee754/float128/float1282mpn.c
@@ -0,0 +1,20 @@
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define __FLOAT128_OVERRIDE
+
+#include "../ldbl-128/ldbl2mpn.c"
diff --git a/sysdeps/ieee754/ldbl-128/ldbl2mpn.c b/sysdeps/ieee754/ldbl-128/ldbl2mpn.c
index 71a6f04..e23cb76 100644
--- a/sysdeps/ieee754/ldbl-128/ldbl2mpn.c
+++ b/sysdeps/ieee754/ldbl-128/ldbl2mpn.c
@@ -18,10 +18,14 @@
 #include "gmp.h"
 #include "gmp-impl.h"
 #include "longlong.h"
-#include <ieee754.h>
-#include <float.h>
-#include <math.h>
-#include <stdlib.h>
+
+#ifdef __FLOAT128_OVERRIDE
+# include <float128_private.h>
+#else
+# include <ieee754.h>
+# include <float.h>
+# include <math.h>
+#endif
 
 /* Convert a `long double' in IEEE854 quad-precision format to a
    multi-precision integer representing the significand scaled up by its
@@ -29,9 +33,15 @@
    (MPN frexpl). */
 
 mp_size_t
+#ifdef __FLOAT128_OVERRIDE
+__mpn_extract_float128 (mp_ptr res_ptr, mp_size_t size,
+			int *expt, int *is_neg,
+			_Float128 value)
+#else
 __mpn_extract_long_double (mp_ptr res_ptr, mp_size_t size,
 			   int *expt, int *is_neg,
 			   long double value)
+#endif
 {
   union ieee854_long_double u;
   u.d = value;
-- 
2.4.11