sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 69 insertions, 0 deletions

diff --git a/device/lib/tanhf.c b/device/lib/tanhf.c
new file mode 100644
index 0000000..e2e18f3
--- /dev/null
+++ b/device/lib/tanhf.c
@@ -0,0 +1,69 @@
+/*-------------------------------------------------------------------------
+   tanhf.c - Computes tanh(x) where x is a 32-bit float as outlined in [1].
+
+   Copyright (C) 2001, 2002, Jesus Calvino-Fraga, jesusc@ieee.org
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option) any
+   later version.
+
+   This 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this library; see the file COPYING. If not, write to the
+   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.
+
+   As a special exception, if you link this library with other files,
+   some of which are compiled with SDCC, to produce an executable,
+   this library does not by itself cause the resulting executable to
+   be covered by the GNU General Public License. This exception does
+   not however invalidate any other reasons why the executable file
+   might be covered by the GNU General Public License.
+-------------------------------------------------------------------------*/
+
+/* [1] William James Cody and W.  M.  Waite.  _Software manual for the
+   elementary functions_, Englewood Cliffs, N.J.:Prentice-Hall, 1980. */
+
+/* Version 1.0 - Initial release */
+
+#include <math.h>
+#include <errno.h>
+
+#define P0 -0.8237728127E+0
+#define P1 -0.3831010665E-2
+#define Q0  0.2471319654E+1
+#define Q1  0.1000000000E+1
+
+/* ln(3)/2 */
+#define K1  0.5493061443E+0
+/* SBIG=[ln(2)+(t+1)*ln(B)]/2 */
+#define SBIG 9.01091
+
+#define P(g) ((P1*g+P0)*g)
+#define Q(g) (Q1*g+Q0)
+
+float tanhf(float x) _FLOAT_FUNC_REENTRANT
+{
+    float f, g, r;
+
+    f=fabsf(x);
+    if(f>SBIG) r=1.0;
+    else if(f>K1)
+    {
+        r=0.5-1.0/(expf(f+f)+1.0);
+        r+=r;
+    }
+    else if(f<EPS) r=f;
+    else
+    {
+        g=f*f;
+        r=f+f*(P(g)/Q(g));
+    }
+    if(x<0.0) r=-r;
+    return r;
+}