X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Futil%2Fhalf_float.h;h=c9fad9a9400543f03d2fb28ba8c78262211104fa;hb=848e7b947d0d505d54d27780b052e5532c721678;hp=64f2042101857f4b6560446a43337ece72ee7666;hpb=183db3a64557d5d231ef58ab5666286f323ff333;p=mesa.git

diff --git a/src/util/half_float.h b/src/util/half_float.h
index 64f20421018..c9fad9a9400 100644
--- a/src/util/half_float.h
+++ b/src/util/half_float.h
@@ -2,6 +2,7 @@
  * Mesa 3-D graphics library
  *
  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
+ * 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"),
@@ -25,14 +26,57 @@
 #ifndef _HALF_FLOAT_H_
 #define _HALF_FLOAT_H_
 
+#include <stdbool.h>
 #include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+#define FP16_ONE     ((uint16_t) 0x3c00)
+#define FP16_ZERO    ((uint16_t) 0)
+
 uint16_t _mesa_float_to_half(float val);
 float _mesa_half_to_float(uint16_t val);
+uint8_t _mesa_half_to_unorm8(uint16_t v);
+uint16_t _mesa_uint16_div_64k_to_half(uint16_t v);
+
+/*
+ * _mesa_float_to_float16_rtz is no more than a wrapper to the counterpart
+ * softfloat.h call. 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.
+ */
+uint16_t _mesa_float_to_float16_rtz(float val);
+
+static inline uint16_t
+_mesa_float_to_float16_rtne(float val)
+{
+   return _mesa_float_to_half(val);
+}
+
+static inline bool
+_mesa_half_is_negative(uint16_t h)
+{
+   return !!(h & 0x8000);
+}
+
+
+#ifdef __cplusplus
+
+/* Helper class for disambiguating fp16 from uint16_t in C++ overloads */
+
+struct float16_t {
+   uint16_t bits;
+   float16_t(float f) : bits(_mesa_float_to_half(f)) {}
+   float16_t(double d) : bits(_mesa_float_to_half(d)) {}
+   float16_t(uint16_t bits) : bits(bits) {}
+   static float16_t one() { return float16_t(FP16_ONE); }
+   static float16_t zero() { return float16_t(FP16_ZERO); }
+};
+
+#endif
+
 
 #ifdef __cplusplus
 } /* extern C */