ldbl-128ibm-compat: Provide ieee128 symbols to narrow functions

Move the narrow math aliasing macros into a new sysdep header file
math-narrow-alias-float128.h.  Then, provide an override header
to supply the necessary changes to supply the *ieee128 aliases of
these symbols.

This adds ieee128 aliases for faddl, fdivl, fmull, fsubl, daddl, ddivl,
dmull, dsubl.

3 files changed, 74 insertions, 0 deletions

diff --git a/sysdeps/generic/math-narrow-alias-float128.h b/sysdeps/generic/math-narrow-alias-float128.h
new file mode 100644
index 0000000000..4788708c78
--- /dev/null
+++ b/sysdeps/generic/math-narrow-alias-float128.h
@@ -0,0 +1,32 @@
+/* Helper macros for functions returning a narrower type.  F128-specific.
+   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/>.  */
+
+#if __HAVE_FLOAT64X_LONG_DOUBLE
+# define libm_alias_float32_float128(func)	\
+  libm_alias_float32_float128_main (func)
+# define libm_alias_float64_float128(func)	\
+  libm_alias_float64_float128_main (func)
+#else
+# define libm_alias_float32_float128(func)			\
+  libm_alias_float32_float128_main (func)			\
+  weak_alias (__f32 ## func ## f128, f32 ## func ## f64x)
+# define libm_alias_float64_float128(func)			\
+  libm_alias_float64_float128_main (func)			\
+  weak_alias (__f64 ## func ## f128, f64 ## func ## f64x)	\
+  weak_alias (__f64 ## func ## f128, f32x ## func ## f64x)
+#endif
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/Versions b/sysdeps/ieee754/ldbl-128ibm-compat/Versions
index db255cb282..46ff4446f2 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/Versions
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/Versions
@@ -47,6 +47,14 @@ libm {
     __exp2ieee128;
     __expieee128;
     __expm1ieee128;
+    __f32addieee128;
+    __f32divieee128;
+    __f32mulieee128;
+    __f32subieee128;
+    __f64addieee128;
+    __f64divieee128;
+    __f64mulieee128;
+    __f64subieee128;
     __fabsieee128;
     __fdimieee128;
     __floorieee128;
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/math-narrow-alias-float128.h b/sysdeps/ieee754/ldbl-128ibm-compat/math-narrow-alias-float128.h
new file mode 100644
index 0000000000..5353b539d7
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/math-narrow-alias-float128.h
@@ -0,0 +1,34 @@
+/* Helper macros for functions returning a narrower type.  F128-specific.
+   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/>.  */
+
+#if __HAVE_FLOAT64X_LONG_DOUBLE
+# define libm_alias_float32_float128(func)	\
+  libm_alias_float32_float128_main (func)
+# define libm_alias_float64_float128(func)	\
+  libm_alias_float64_float128_main (func)
+#else
+# define libm_alias_float32_float128(func)				\
+  libm_alias_float32_float128_main (func)				\
+  weak_alias (__f32 ## func ## f128, f32 ## func ## f64x)		\
+  weak_alias (__f32 ## func ## f128, __ ## f32 ## func ## ieee128)
+# define libm_alias_float64_float128(func)				\
+  libm_alias_float64_float128_main (func)				\
+  weak_alias (__f64 ## func ## f128, f64 ## func ## f64x)		\
+  weak_alias (__f64 ## func ## f128, f32x ## func ## f64x)		\
+  weak_alias (__f64 ## func ## f128, __ ## f64 ## func ## ieee128)
+#endif