1 files changed, 45 insertions, 0 deletions
diff --git a/math/s_exp10m1_template.c b/math/s_exp10m1_template.c
new file mode 100644
index 0000000000..ea3ef54e82
--- /dev/null
+++ b/math/s_exp10m1_template.c
@@ -0,0 +1,45 @@
+/* Return exp10(X) - 1.
+   Copyright (C) 2024 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/>.  */
+
+#include <errno.h>
+#include <math.h>
+#include <math_private.h>
+#include <math-underflow.h>
+
+FLOAT
+M_DECL_FUNC (__exp10m1) (FLOAT x)
+{
+  if (isgreaterequal (x, M_LIT (-0.5)) && islessequal (x, M_LIT (0.5)))
+    {
+      FLOAT ret = M_SUF (__expm1) (M_MLIT (M_LN10) * x);
+      math_check_force_underflow (ret);
+      return ret;
+    }
+  else if (isgreater (x, M_MANT_DIG / 3 + M_LIT (2.0)))
+    {
+      FLOAT ret = M_SUF (__ieee754_exp10) (x);
+      if (!isfinite (ret) && isfinite (x))
+	__set_errno (ERANGE);
+      return ret;
+    }
+  else if (isless (x, -(M_MANT_DIG / 3) - M_LIT (2.0)))
+    return M_LIT (-1.0);
+  else
+    return M_SUF (__ieee754_exp10) (x) - M_LIT (1.0);
+}
+declare_mgen_alias (__exp10m1, exp10m1);