aboutsummaryrefslogtreecommitdiff
path: root/softfloat/ui32_to_f16.c
diff options
context:
space:
mode:
authorAndrew Waterman <andrew@sifive.com>2017-09-24 20:25:34 -0700
committerAndrew Waterman <andrew@sifive.com>2017-09-24 20:25:34 -0700
commitbd85811c35ea38180d27440507fc222d585ef780 (patch)
tree214c6b615d7775f73da5ff9a94bd4a0a2772f9cf /softfloat/ui32_to_f16.c
parentb86f2a51f522f020ad0d90f598f4c501f41da232 (diff)
downloadspike-bd85811c35ea38180d27440507fc222d585ef780.zip
spike-bd85811c35ea38180d27440507fc222d585ef780.tar.gz
spike-bd85811c35ea38180d27440507fc222d585ef780.tar.bz2
Update SoftFloat
Diffstat (limited to 'softfloat/ui32_to_f16.c')
-rw-r--r--softfloat/ui32_to_f16.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/softfloat/ui32_to_f16.c b/softfloat/ui32_to_f16.c
new file mode 100644
index 0000000..09dcc8c
--- /dev/null
+++ b/softfloat/ui32_to_f16.c
@@ -0,0 +1,65 @@
+
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3d, by John R. Hauser.
+
+Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
+California. All Rights Reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+ this list of conditions, and the following disclaimer.
+
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions, and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+ 3. Neither the name of the University nor the names of its contributors may
+ be used to endorse or promote products derived from this software without
+ specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
+DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+=============================================================================*/
+
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "softfloat.h"
+
+float16_t ui32_to_f16( uint32_t a )
+{
+ int_fast8_t shiftDist;
+ union ui16_f16 u;
+ uint_fast16_t sig;
+
+ shiftDist = softfloat_countLeadingZeros32( a ) - 21;
+ if ( 0 <= shiftDist ) {
+ u.ui =
+ a ? packToF16UI(
+ 0, 0x18 - shiftDist, (uint_fast16_t) a<<shiftDist )
+ : 0;
+ return u.f;
+ } else {
+ shiftDist += 4;
+ sig =
+ (shiftDist < 0)
+ ? a>>(-shiftDist) | ((uint32_t) (a<<(shiftDist & 31)) != 0)
+ : (uint_fast16_t) a<<shiftDist;
+ return softfloat_roundPackToF16( 0, 0x1C - shiftDist, sig );
+ }
+
+}
+