Bob Wilson a7a61e2701 Make clz/ctz builtins defined for zero on ARM targets. rdar://10732455 ... ARM supports clz and ctz directly and both operations have well-defined results for zero. There is no disadvantage in performance to using the defined-at-zero versions of llvm.ctlz/cttz intrinsics. We're running into ARM-specific code written with the assumption that __builtin_clz(0) == 32, even though that value is technically undefined. The code is failing now because of llvm optimizations that are taking advantage of the undef behavior (specifically svn r147255). There's nothing wrong with that optimization on x86 where any incorrect assumptions about __builtin_clz(0) will quickly be exposed. For ARM, though, optimizations based on that undef behavior are likely to cause subtle bugs. Other targets with defined-at-zero clz/ctz support may want to override the default behavior as well. llvm-svn: 149086		2012-01-26 22:14:27 +00:00
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Builtins.cpp	Allow the preprocessor to be constructed without performing target-	2011-09-01 23:39:15 +00:00
CMakeLists.txt	Update CMake dependencies.	2011-12-17 20:08:54 +00:00
ConvertUTF.c	Move ConvertUTF8toUTF32 out of #if 0, in preparation for a patch which needs it.	2011-11-01 02:10:54 +00:00
Diagnostic.cpp	Unweaken vtables as per http://llvm.org/docs/CodingStandards.html#ll_virtual_anch	2011-12-20 02:48:34 +00:00
DiagnosticIDs.cpp	Remove unnecessary default cases in switches over enums.	2012-01-17 02:30:50 +00:00
FileManager.cpp	remove unneeded config.h includes	2011-12-22 22:49:47 +00:00
FileSystemStatCache.cpp	Unweaken vtables as per http://llvm.org/docs/CodingStandards.html#ll_virtual_anch	2011-12-20 02:48:34 +00:00
IdentifierTable.cpp	Remove unreachable code in Clang. (replace with llvm_unreachable where appropriate or when GCC requires it)	2012-01-17 06:56:22 +00:00
LangOptions.cpp	Add a -cc1-level option -fmodule-name=<name>, which will be used when	2011-11-15 19:35:01 +00:00
Makefile	Basic: Simplify getClangRepositoryPath and getClangRevision.	2010-09-29 19:15:29 +00:00
Module.cpp	Remove unreachable code in Clang. (replace with llvm_unreachable where appropriate or when GCC requires it)	2012-01-17 06:56:22 +00:00
SourceLocation.cpp	Clean up as many of the comments in Basic I can find to talk in terms of	2011-07-26 05:17:23 +00:00
SourceManager.cpp	Fix bugs in SourceManager::computeMacroArgsCache() and add a unit test for it.	2011-12-21 16:56:35 +00:00
TargetInfo.cpp	Add support for bitcasts to vector type in Evaluate.	2011-12-22 03:51:45 +00:00
Targets.cpp	Make clz/ctz builtins defined for zero on ARM targets. rdar://10732455	2012-01-26 22:14:27 +00:00
TokenKinds.cpp	This patch adds a PUNCTUATOR macro (specialization of TOK) in TokenKinds.def and makes use of it in tok::getTokenSimpleSpelling.	2009-11-28 16:09:28 +00:00
Version.cpp	Partially revert r147195; lib/Basic/Version.cpp conditionally depends on config.h.	2011-12-26 22:43:17 +00:00
VersionTuple.cpp	remove unneeded llvm:: namespace qualifiers on some core types now that LLVM.h imports	2011-07-23 10:55:15 +00:00