sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 55 insertions, 0 deletions

diff --git a/device/lib/atan2f.c b/device/lib/atan2f.c
new file mode 100644
index 0000000..3734578
--- /dev/null
+++ b/device/lib/atan2f.c
@@ -0,0 +1,55 @@
+/*-------------------------------------------------------------------------
+   atan2f.c - Computes atan2(x) where x is a 32-bit float.
+
+   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.
+-------------------------------------------------------------------------*/
+
+/* Version 1.0 - Initial release */
+
+#include <math.h>
+#include <errno.h>
+
+float atan2f(float x, float y)
+{
+    float r;
+
+    if ((x==0.0) && (y==0.0))
+    {
+        errno=EDOM;
+        return 0.0;
+    }
+
+    if(fabsf(y)>=fabsf(x))
+    {
+        r=atanf(x/y);
+        if(y<0.0) r+=(x>=0?PI:-PI);
+    }
+    else
+    {
+        r=-atanf(y/x);
+        r+=(x<0.0?-HALF_PI:HALF_PI);
+    }
+    return r;
+}