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Florian Hahn 94d1a0f315 [LCSSA] Forget values we create LCSSA phis for 
Summary:
Currently we only forget the loop we added LCSSA phis for. But SCEV
expressions in other loops could also depend on the instruction we added
a PHI for and currently we do not invalidate those expressions. This can
happen when we use ScalarEvolution before converting a function to LCSSA
form. The SCEV expressions will refer to the non-LCSSA value. If this
SCEV expression is then used with the expander, we do not preserve LCSSA
form.

This patch properly forgets the values we created PHIs for. Those need
to be recomputed again. This patch fixes PR43458.

Currently SCEV::verify does not catch this mismatch and any test would
need to run multiple passes to trigger the error (e.g. -loop-reduce
-loop-unroll). I will also look into catching this kind of mismatch in
the verifier. Also, we currently forget the whole loop in LCSSA and I'll
check if we can be more surgical.

Reviewers: efriedma, sanjoy.google, reames

Reviewed By: efriedma

Subscribers: zzheng, hiraditya, javed.absar, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68194
2019-10-29 12:05:09 +00:00
benchmarks
bindings Update version number in llvm python bindings 2019-10-25 17:14:11 -04:00
cmake build: remove LLVM_CXX_STD extension point 2019-10-25 11:51:47 -07:00
docs [Remarks] Remove references to ELF support 2019-10-28 12:50:46 -07:00
examples [examples] Add a dependency on ExecutionEngine to LLJITWithObjectCache example. 2019-10-21 22:29:29 +00:00
include [LCSSA] Forget values we create LCSSA phis for 2019-10-29 12:05:09 +00:00
lib [LCSSA] Forget values we create LCSSA phis for 2019-10-29 12:05:09 +00:00
projects Add few docs and implementation of strcpy and strcat. 2019-10-04 17:30:54 +00:00
resources
runtimes Adding support for overriding LLVM_ENABLE_RUNTIMES for runtimes builds. 2019-09-24 22:38:18 +00:00
test [LCSSA] Forget values we create LCSSA phis for 2019-10-29 12:05:09 +00:00
tools [llvm-objcopy][MachO] Implement --only-section 2019-10-28 16:00:20 +09:00
unittests Recommit "Add a heap alloc site marker field to the ExtraInfo in MachineInstrs" 2019-10-28 16:59:32 -07:00
utils [lit] Remove callback indirection 2019-10-28 18:56:17 -07:00
.arcconfig
.clang-format
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore gitignore: Ignore Qt Creator project configuration files. NFC 2019-06-12 08:28:31 +00:00
CMakeLists.txt build: remove LLVM_CXX_STD extension point 2019-10-25 11:51:47 -07:00
CODE_OWNERS.TXT Update email address in CODE_OWNERS 2019-07-01 16:01:15 +00:00
configure
CREDITS.TXT Update email address. 2019-07-17 07:02:02 +00:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
llvm.spec.in Update structured references to the license to the new license. 2019-01-19 11:30:51 +00:00
LLVMBuild.txt Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
README.txt Test commit. 2019-10-03 14:57:49 +00:00
RELEASE_TESTERS.TXT Update the list of platforms & archs 2018-12-16 14:47:16 +00:00

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