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Simon Dardis 13522bc598 [CodeGenPrepare] Check that erased sunken address are not reused
CodeGenPrepare sinks address computations from one basic block to another
and attempts to reuse address computations that have already been sunk. If
the same address computation appears twice with the first instance as an
operand of a load whose result is an operand to a simplifable select,
CodeGenPrepare simplifies the select and recursively erases the now dead
instructions. CodeGenPrepare then attempts to use the erased address
computation for the second load.

Fix this by erasing the cached address value if it has zero uses before
looking for the address value in the sunken address map.

This partially resolves PR35209.

Thanks to Alexander Richardson for reporting the issue!

This fixed version relands r318032 which was reverted in r318049 due to
sanitizer buildbot failures.

Reviewers: john.brawn

Differential Revision: https://reviews.llvm.org/D39841

llvm-svn: 318956
2017-11-24 16:45:28 +00:00
bindings Update go bindings to use new functions from rL317135. 2017-11-02 10:22:26 +00:00
cmake [CMake] Allow for Solaris ld -V output on stdout 2017-11-17 17:12:14 +00:00
docs [LV] Model masking in VPlan, introducing VPInstructions 2017-11-20 12:01:47 +00:00
examples Fix broken links to the Itanium CXX ABI 2017-09-12 00:19:11 +00:00
include [SCEV] : Simplify loop to range-loop.NFC. 2017-11-24 14:35:38 +00:00
lib [CodeGenPrepare] Check that erased sunken address are not reused 2017-11-24 16:45:28 +00:00
projects Re-revert "Refactor debuginfo-tests." 2017-11-21 01:20:28 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
runtimes [CMake][runtimes] Don't passthrough prefixes for non-default targets 2017-11-17 23:51:53 +00:00
test [CodeGenPrepare] Check that erased sunken address are not reused 2017-11-24 16:45:28 +00:00
tools Remove unnecessary code. 2017-11-22 20:02:57 +00:00
unittests [YAMLParser] Don't crash on null keys in KeyValueNodes. 2017-11-23 20:57:20 +00:00
utils Reverted rL318911 since it broke the sanitizer-windows. 2017-11-23 13:23:21 +00:00
.arcconfig project_id is from another era in phabricator land and does not provide any value. 2016-09-27 15:47:29 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitattributes [MC] Fix regression tests on Windows when git “core.autocrlf” is set to true. 2017-11-17 21:59:43 +00:00
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt Re-revert "Refactor debuginfo-tests." 2017-11-21 01:20:28 +00:00
CODE_OWNERS.TXT Update my email addresses, NFC. 2017-10-26 10:16:54 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Add myself to CREDITS.txt 2017-09-18 14:33:39 +00:00
LICENSE.TXT Bump year to 2017 in LICENSE.txt 2017-01-12 18:02:42 +00:00
llvm.spec.in [Sparc] Implement i64 load/store support for 32-bit sparc. 2015-08-10 19:11:39 +00:00
LLVMBuild.txt
README.txt Test commit access 2017-08-18 02:39:28 +00:00
RELEASE_TESTERS.TXT Update my email addresses, NFC. 2017-10-26 10:16:54 +00:00

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