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Michael Zolotukhin 97a2ec64f5 [LoopSimplify] Rebuild LCSSA for the inner loop after separating nested loops. 
Summary:
This hopefully fixes PR28825. The problem now was that a value from the
original loop was used in a subloop, which became a sibling after separation.
While a subloop doesn't need an lcssa phi node, a sibling does, and that's
where we broke LCSSA. The most natural way to fix this now is to simply call
formLCSSA on the original loop: it'll do what we've been doing before plus
it'll cover situations described above.

I think we don't need to run formLCSSARecursively here, and we have an assert
to verify this (I've tried testing it on LLVM testsuite + SPECs). I'd be happy
to be corrected here though.

I also changed a run line in the test from '-lcssa -loop-unroll' to
'-lcssa -loop-simplify -indvars', because it exercises LCSSA
preservation to the same extent, but also makes less unrelated
transformation on the CFG, which makes it easier to verify.

Reviewers: chandlerc, sanjoy, silvas

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D23288

llvm-svn: 278173
2016-08-09 22:44:56 +00:00
bindings
cmake Remove LLVM_ENABLE_LIBCXXABI 2016-08-04 10:24:48 +00:00
docs Revert "[X86] Support the "ms-hotpatch" attribute." 2016-08-08 21:20:15 +00:00
examples [ExecutionEngine][MCJIT][Orc] Replace RuntimeDyld::SymbolInfo with JITSymbol. 2016-08-01 20:49:11 +00:00
include Add a platform independent version of __PRETTY_FUNCTION__. 2016-08-09 22:03:45 +00:00
lib [LoopSimplify] Rebuild LCSSA for the inner loop after separating nested loops. 2016-08-09 22:44:56 +00:00
projects
resources
runtimes
test [LoopSimplify] Rebuild LCSSA for the inner loop after separating nested loops. 2016-08-09 22:44:56 +00:00
tools [llvm-cov] Swapped the line and count columns. 2016-08-09 19:53:35 +00:00
unittests [ADT] Change iterator_adaptor_base's default template arguments to forward more underlying typedefs 2016-08-09 20:23:13 +00:00
utils [vim] Update the llvm.vim syntax file 2016-08-09 18:34:19 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore
CMakeLists.txt Remove LLVM_ENABLE_LIBCXXABI 2016-08-04 10:24:48 +00:00
CODE_OWNERS.TXT test commit 2016-08-02 19:25:17 +00:00
configure
CREDITS.TXT Shamelessly add myself to CREDITS.TXT 2016-08-04 16:28:22 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt Revert rL277454 2016-08-02 13:26:07 +00:00
RELEASE_TESTERS.TXT Adding RELEASE_TESTERS.TXT 2016-07-21 16:46:44 +00:00

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