util: add fp64 -> fp32 conversion support for RTNE and RTZ rounding modes

[mesa.git] / src / util / double.h

diff --git a/src/util/double.h b/src/util/double.h
new file mode 100644 (file)
index 0000000..784aa30
--- /dev/null
+++ b/src/util/double.h
@@ -0,0 +1,53 @@
+/*
+ * Mesa 3-D graphics library
+ *
+ * Copyright (C) 2018-2019 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _DOUBLE_H_
+#define _DOUBLE_H_
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * This API is no more than a wrapper to the counterpart softfloat.h
+ * calls. Still, softfloat.h conversion API is meant to be kept private. In
+ * other words, only use the API published here, instead of calling directly
+ * the softfloat.h one.
+ */
+
+float _mesa_double_to_float(double val);
+float _mesa_double_to_float_rtz(double val);
+
+static inline float
+_mesa_double_to_float_rtne(double val)
+{
+   return _mesa_double_to_float(val);
+}
+
+#ifdef __cplusplus
+} /* extern C */
+#endif
+
+#endif /* _DOUBLE_H_ */