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Sameer Sahasrabuddhe 460e2aae48 [AMDGPU] lower-switch in preISel as a workaround for legacy DA 
Summary:
The default target of the switch instruction may sometimes be an
"unreachable" block, when it is guaranteed that one of the cases is
always taken. The dominator tree concludes that such a switch
instruction does not have an immediate post dominator. This confuses
divergence analysis, which is unable to propagate sync dependence to
the targets of the switch instruction.

As a workaround, the AMDGPU target now invokes lower-switch as a
preISel pass. LowerSwitch is designed to handle the unreachable
default target correctly, allowing the divergence analysis to locate
the correct immediate dominator of the now-lowered switch.

Reviewers: arsenm, nhaehnle

Reviewed By: nhaehnle

Subscribers: kzhuravl, jvesely, wdng, nhaehnle, yaxunl, dstuttard, tpr, t-tye, llvm-commits, simoll

Differential Revision: https://reviews.llvm.org/D52221

llvm-svn: 342722
2018-09-21 11:26:55 +00:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings [LLVM-C][OCaml] Add UnifyFunctionExitNodes pass to C and OCaml APIs 2018-09-18 13:36:03 +00:00
cmake Test commit access 2018-09-14 19:43:11 +00:00
docs [Docs] [Support] Correct a missed reference and use up to date .inc examples. 2018-09-21 01:53:51 +00:00
examples [ORC] Update JITCompileCallbackManager to support multi-threaded code. 2018-05-30 01:57:45 +00:00
include [dwarfdump] Verify compatibility of attribute TAGs. 2018-09-21 07:49:29 +00:00
lib [AMDGPU] lower-switch in preISel as a workaround for legacy DA 2018-09-21 11:26:55 +00:00
projects [cmake] Support moving debuginfo-tests to llvm/projects 2017-12-12 17:06:08 +00:00
resources
runtimes Revert "[CMake] Pass Clang defaults to runtimes builds" 2018-07-13 20:01:55 +00:00
test [AMDGPU] lower-switch in preISel as a workaround for legacy DA 2018-09-21 11:26:55 +00:00
tools [MCA] Remove dependency on CodeGen. 2018-09-21 01:54:08 +00:00
unittests Fix DenseSet::ConstIterator typedefs 2018-09-20 23:11:27 +00:00
utils [unittests] Do not use llvm::sort in googlemock 2018-09-20 04:27:32 +00:00
.arcconfig [llvm] Set up .arcconfig to point to Diffusion L repository 2018-01-12 15:37:41 +00:00
.clang-format
.clang-tidy
.gitattributes [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 2018-05-09 02:40:45 +00:00
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt [WebAssembly] Revert r342701, "Add WebAssembly to LLVM_ALL_TARGTS." 2018-09-21 03:24:42 +00:00
CODE_OWNERS.TXT Add owner for llvm-objcopy 2018-08-09 22:05:19 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Update my information in the CREDITS file. 2018-06-15 20:02:11 +00:00
LICENSE.TXT Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm.spec.in
LLVMBuild.txt
README.txt Test commit: remove a blank line 2018-06-08 21:21:55 +00:00
RELEASE_TESTERS.TXT Remove myself from the release testers list. (NFC) 2018-06-20 21:25:50 +00:00

README.txt 

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Please see the documentation provided in docs/ for further
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