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Nirav Dave fa250cad37 Prevent construction of cycle in DAG store merge 
When merging stores in DAGCombiner, add check to ensure that no
dependenices exist that would cause the construction of a cycle in our
DAG.  This may happen if one store has a data dependence on another
instruction (e.g. a load) which itself has a (chain) dependence on
another store being merged. These stores cannot be merged safely and
doing so results in a cycle that is discovered in LegalizeDAG.

This test is only done in cases where Antialias analysis is used (UseAA)
as non-AA store merge candidates will be merged logically after all
loads which have been checked to not alias.

Reviewers: ahatanak, spatel, niravd, arsenm, hfinkel, tstellarAMD, jyknight

Subscribers: llvm-commits, tberghammer, danalbert, srhines

Differential Revision: http://reviews.llvm.org/D18336

llvm-svn: 264461
 		2016-03-25 21:06:30 +00:00
clang [ASTMatchers] Don't use brace-init lists. 2016-03-25 19:41:32 +00:00
clang-tools-extra 3rd attempt of fixup with -std=c++11 2016-03-25 00:24:35 +00:00
compiler-rt [sanitizer] Add memset, memmove, and memcpy to the common interceptors 2016-03-25 19:33:45 +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 math: Fix ilogb(double) return type 2016-02-24 00:52:15 +00:00
libcxx Implement is_always_lock_free 2016-03-25 15:48:21 +00:00
libcxxabi [libcxxabi] Disable cxa_thread_atexit_test if unavailable 2016-03-17 10:00:24 +00:00
libunwind [AArch64] Fix libunwind build when using GNU assembler 2016-02-11 21:22:57 +00:00
lld Remove declaration of SymbolTable::codegen, this method was deleted in r264091 2016-03-25 18:20:33 +00:00
lldb Fix now-ambiguous references to Error. 2016-03-25 19:27:24 +00:00
llgo [llgo] Increment "Debug Info Version" 2016-03-23 23:09:00 +00:00
llvm Prevent construction of cycle in DAG store merge 2016-03-25 21:06:30 +00:00
openmp [OMPT] Fix parallel_id and task_id in loop_end with schedule static 2016-03-24 12:52:20 +00:00
polly Add files forgotten in r264452 2016-03-25 20:32:51 +00:00