1 files changed, 67 insertions, 0 deletions
diff --git a/sysdeps/ieee754/soft-fp/s_dsqrtl.c b/sysdeps/ieee754/soft-fp/s_dsqrtl.c
new file mode 100644
index 0000000000..85ea8538a5
--- /dev/null
+++ b/sysdeps/ieee754/soft-fp/s_dsqrtl.c
@@ -0,0 +1,67 @@
+/* Square root of long double (ldbl-128) value, narrowing the result to
+   double, using soft-fp.
+   Copyright (C) 2021 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
+   <https://www.gnu.org/licenses/>.  */
+
+#define f32xsqrtf64x __hide_f32xsqrtf64x
+#define f32xsqrtf128 __hide_f32xsqrtf128
+#define f64sqrtf64x __hide_f64sqrtf64x
+#define f64sqrtf128 __hide_f64sqrtf128
+#include <math.h>
+#undef f32xsqrtf64x
+#undef f32xsqrtf128
+#undef f64sqrtf64x
+#undef f64sqrtf128
+
+#include <math-narrow.h>
+#include <libc-diag.h>
+
+/* Some components of the result's significand and exponent are not
+   set in cases where they are not used in packing, but the compiler
+   does not see that they are set in all cases where they are used,
+   resulting in warnings that they may be used uninitialized.  */
+DIAG_PUSH_NEEDS_COMMENT;
+DIAG_IGNORE_NEEDS_COMMENT (7, "-Wmaybe-uninitialized");
+#include <soft-fp.h>
+#include <double.h>
+#include <quad.h>
+
+double
+__dsqrtl (_Float128 x)
+{
+  FP_DECL_EX;
+  FP_DECL_Q (X);
+  FP_DECL_Q (R);
+  FP_DECL_D (RN);
+  double ret;
+
+  FP_INIT_ROUNDMODE;
+  FP_UNPACK_Q (X, x);
+  FP_SQRT_Q (R, X);
+#if _FP_W_TYPE_SIZE < 64
+  FP_TRUNC_COOKED (D, Q, 2, 4, RN, R);
+#else
+  FP_TRUNC_COOKED (D, Q, 1, 2, RN, R);
+#endif
+  FP_PACK_D (ret, RN);
+  FP_HANDLE_EXCEPTIONS;
+  CHECK_NARROW_SQRT (ret, x);
+  return ret;
+}
+DIAG_POP_NEEDS_COMMENT;
+
+libm_alias_double_ldouble (sqrt)