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Michael Zolotukhin de19ed1eb1 [LoopUnroll] Avoid unnecessary DT recomputation. 
Summary:
When we completely unroll a loop, it's pretty easy to update DT in-place and
thus avoid rebuilding it. DT recalculation is one of the most time-consuming
tasks in loop-unroll, so avoiding it at least in case of full unroll should be
beneficial.

On some extreme (but still real-world) tests this patch improves compile time by
~2x.

Reviewers: escha, jmolloy, hfinkel, sanjoy, chandlerc

Subscribers: joker.eph, sanjoy, llvm-commits

Differential Revision: http://reviews.llvm.org/D17473

llvm-svn: 261595
 		2016-02-23 00:30:50 +00:00
clang Lex: Check for 0 buckets on header map construction 2016-02-22 22:24:22 +00:00
clang-tools-extra Add a new check, cert-env33-c, that diagnoses uses of system(), popen(), and _popen() to execute a command processor. This check corresponds to the CERT secure coding rule: https://www.securecoding.cert.org/confluence/pages/viewpage.action?pageId=2130132 2016-02-22 16:01:06 +00:00
compiler-rt [Sanitizer] Introduce ListOfModules object and use it to replace GetListOfModules(). 2016-02-22 18:52:51 +00:00
debuginfo-tests New round of fixes for "Always compile debuginfo-tests for the host triple" 2014-10-18 23:47:59 +00:00
libclc Add .gitignore for build directories 2016-02-17 00:27:31 +00:00
libcxx Fix __is_referenceable to work with vector types. Fixes PR#26654 and 26656. Thanks to Evgeniy for the reports, and to Eric for the suggestion on how to fix it. 2016-02-22 22:13:03 +00:00
libcxxabi [libcxxabi] Teach cxa_demangle about Hexagon's long double size 2016-01-20 14:10:23 +00:00
libunwind [AArch64] Fix libunwind build when using GNU assembler 2016-02-11 21:22:57 +00:00
lld Handle a weak undefined tls to archive member. 2016-02-22 23:19:29 +00:00
lldb Fix Clang-tidy modernize-use-nullptr and modernize-use-default warnings in source/Commands/CommandObjectCommands.cpp; other minor fixes. 2016-02-22 23:46:47 +00:00
llgo [llgo] Force exporting __morestack from llgoi 2015-11-27 04:46:46 +00:00
llvm [LoopUnroll] Avoid unnecessary DT recomputation. 2016-02-23 00:30:50 +00:00
openmp Remove unnecessary semicolons after braces 2016-02-18 19:38:25 +00:00
polly Add test case for [FIX] commit r261474 2016-02-21 21:53:39 +00:00