diff options
| author | Harry Liebel <Harry.Liebel@arm.com> | 2015-07-30 09:50:58 +0000 |
|---|---|---|
| committer | lersek <lersek@Edk2> | 2015-07-30 09:50:58 +0000 |
| commit | d799c0283259ed7709055aca3871e8f67f38610a (patch) | |
| tree | 56ab3995e804868c5181e826c0547bba242d4f3a /StdLib/LibC/Main/Arm/floatunsidf.c | |
| parent | 3352b62bebfd1e5c2e9961f481df968ab317d78d (diff) | |
| download | edk2-platforms-d799c0283259ed7709055aca3871e8f67f38610a.tar.xz | |
StdLib/LibC: Provide missing ARM symbols
Provide missing functionality by using files from LLVM.
Changes made:
- Formatting changes (tabs to spaces, DOS line endings etc).
- Simplified 'int_endianness.h' to work for our case.
- Added LLVM licence to the individual files.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Harry Liebel <Harry.Liebel@arm.com>
Reviewed-by: Olivier Martin <Olivier.Martin@arm.com>
Reviewed-by: Daryl McDaniel <edk2-lists@mc2research.org>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18117 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'StdLib/LibC/Main/Arm/floatunsidf.c')
| -rw-r--r-- | StdLib/LibC/Main/Arm/floatunsidf.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/StdLib/LibC/Main/Arm/floatunsidf.c b/StdLib/LibC/Main/Arm/floatunsidf.c new file mode 100644 index 0000000000..5f5fb1e7e5 --- /dev/null +++ b/StdLib/LibC/Main/Arm/floatunsidf.c @@ -0,0 +1,71 @@ +/**
+University of Illinois/NCSA
+Open Source License
+
+Copyright (c) 2009-2014 by the contributors listed in CREDITS.TXT
+
+All rights reserved.
+
+Developed by:
+
+ LLVM Team
+
+ University of Illinois at Urbana-Champaign
+
+ http://llvm.org
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal with
+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:
+
+ * Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimers.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimers in the
+ documentation and/or other materials provided with the distribution.
+
+ * Neither the names of the LLVM Team, University of Illinois at
+ Urbana-Champaign, nor the names of its contributors may be used to
+ endorse or promote products derived from this Software without specific
+ prior written permission.
+
+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
+CONTRIBUTORS 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 WITH THE
+SOFTWARE.
+**/
+
+#define DOUBLE_PRECISION
+#include "fp_lib.h"
+
+#include "int_lib.h"
+
+ARM_EABI_FNALIAS(ui2d, floatunsidf)
+
+COMPILER_RT_ABI fp_t
+__floatunsidf(unsigned int a) {
+
+ const int aWidth = sizeof a * CHAR_BIT;
+
+ // Handle zero as a special case to protect clz
+ if (a == 0) return fromRep(0);
+
+ // Exponent of (fp_t)a is the width of abs(a).
+ const int exponent = (aWidth - 1) - __builtin_clz(a);
+ rep_t result;
+
+ // Shift a into the significand field and clear the implicit bit.
+ const int shift = significandBits - exponent;
+ result = (rep_t)a << shift ^ implicitBit;
+
+ // Insert the exponent
+ result += (rep_t)(exponent + exponentBias) << significandBits;
+ return fromRep(result);
+}
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