[PATCH 4/9] ldbl-128ibm-compat: Add a generic significand() implementation

[Tulio Magno Quites Machado Filho <tuliom at linux dot ibm dot com>]

Create a template for significand and reuse it in the ldbl-128ibm-compat directory.

2018-06-06  Tulio Magno Quites Machado Filho  <tuliom@linux.ibm.com>

	* math/s_significand_template.c: New file.
	* sysdeps/ieee754/ldbl-128ibm-compat/Versions: Add
	__significandieee128.
	* sysdeps/ieee754/ldbl-128ibm-compat/s_significandf128.c: New file.
	* sysdeps/ieee754/ldbl-128ibm-compat/s_significandl.c: New file.

Signed-off-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
---
 math/s_significand_template.c                      | 33 ++++++++++++++++++++++
 sysdeps/ieee754/ldbl-128ibm-compat/Versions        |  1 +
 .../ieee754/ldbl-128ibm-compat/s_significandf128.c | 25 ++++++++++++++++
 3 files changed, 59 insertions(+)
 create mode 100644 math/s_significand_template.c
 create mode 100644 sysdeps/ieee754/ldbl-128ibm-compat/s_significandf128.c

diff --git a/math/s_significand_template.c b/math/s_significand_template.c
new file mode 100644
index 0000000000..c95017e683
--- /dev/null
+++ b/math/s_significand_template.c
@@ -0,0 +1,33 @@
+/* Return the mantissa of a floating-point number.
+   Copyright (C) 2018 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/>.  */
+
+/*
+ * significand(x) computes just
+ * 	scalb(x, (long double) - ilogb(x)),
+ * for exercising the fraction-part(F) IEEE 754-1985 test vector.
+ */
+
+#include <math.h>
+#include <math_private.h>
+
+FLOAT
+M_DECL_FUNC (__significand) (FLOAT x)
+{
+  return M_SUF (__ieee754_scalb) (x,(FLOAT) - M_SUF (__ilogb) (x));
+}
+declare_mgen_alias (__significand, significand)
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/Versions b/sysdeps/ieee754/ldbl-128ibm-compat/Versions
index 8133d874df..06c19569c5 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/Versions
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/Versions
@@ -110,6 +110,7 @@ libm {
     __scalbnieee128;
     __setpayloadieee128;
     __setpayloadsigieee128;
+    __significandieee128;
     __sincosieee128;
     __sinhieee128;
     __sinieee128;
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/s_significandf128.c b/sysdeps/ieee754/ldbl-128ibm-compat/s_significandf128.c
new file mode 100644
index 0000000000..4ae0fde6a5
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/s_significandf128.c
@@ -0,0 +1,25 @@
+/* Get mantissa of long double.
+   Copyright (C) 2018 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/>.  */
+
+#include <float128_private.h>
+#include <math-type-macros-float128.h>
+
+#define __significandf128 __significandieee128
+#undef declare_mgen_alias
+#define declare_mgen_alias(...)
+#include <math/s_significand_template.c>
-- 
2.14.4