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-rw-r--r--sysdeps/ieee754/soft-fp/s_fsubl.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/sysdeps/ieee754/soft-fp/s_fsubl.c b/sysdeps/ieee754/soft-fp/s_fsubl.c
new file mode 100644
index 0000000000..84b1013797
--- /dev/null
+++ b/sysdeps/ieee754/soft-fp/s_fsubl.c
@@ -0,0 +1,55 @@
+/* Subtract long double (ldbl-128) values, narrowing the result to
+ float, using soft-fp.
+ 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/>. */
+
+#define f32subf64x __hide_f32subf64x
+#define f32subf128 __hide_f32subf128
+#include <math.h>
+#undef f32subf64x
+#undef f32subf128
+
+#include <math-narrow.h>
+#include <soft-fp.h>
+#include <single.h>
+#include <quad.h>
+
+float
+__fsubl (_Float128 x, _Float128 y)
+{
+ FP_DECL_EX;
+ FP_DECL_Q (X);
+ FP_DECL_Q (Y);
+ FP_DECL_Q (R);
+ FP_DECL_S (RN);
+ float ret;
+
+ FP_INIT_ROUNDMODE;
+ FP_UNPACK_SEMIRAW_Q (X, x);
+ FP_UNPACK_SEMIRAW_Q (Y, y);
+ FP_SUB_Q (R, X, Y);
+#if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q
+ FP_TRUNC (S, Q, 1, 4, RN, R);
+#else
+ FP_TRUNC (S, Q, 1, 2, RN, R);
+#endif
+ FP_PACK_SEMIRAW_S (ret, RN);
+ FP_HANDLE_EXCEPTIONS;
+ CHECK_NARROW_SUB (ret, x, y);
+ return ret;
+}
+libm_alias_float_ldouble (sub)