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Hal Finkel d7f40f9afa [PowerPC] Fix address-offset folding for plain addi
When folding an addi into a memory access that can take an immediate offset, we
were implicitly assuming that the existing offset was zero. This was incorrect.
If we're dealing with an addi with a plain constant, we can add it to the
existing offset (assuming that doesn't overflow the immediate, etc.), but if we
have anything else (i.e. something that will become a relocation expression),
we'll go back to requiring the existing immediate offset to be zero (because we
don't know what the requirements on that relocation expression might be - e.g.
maybe it is paired with some addis in some relevant way).

On the other hand, when dealing with a plain addi with a regular constant
immediate, the alignment restrictions (from the TOC base pointer, etc.) are
irrelevant.

I've added the test case from PR30280, which demonstrated the bug, but also
demonstrates a missed optimization opportunity (i.e. we don't need the memory
accesses at all).

Fixes PR30280.

llvm-svn: 280789
2016-09-07 07:36:11 +00:00
bindings Formatting with clang-format patch r280700 2016-09-06 17:03:02 +00:00
cmake [CMake] Cleanup LLVM_OPTIMIZED_TABLEGEN 2016-09-06 20:27:07 +00:00
docs Fixed a typo (LLVM/Support/CFG.h -> LLVM/IR/CFG.h) 2016-09-02 11:13:35 +00:00
examples Fix singlton -> singleton typo. 2016-08-26 02:00:21 +00:00
include Add an c++ itanium demangler to llvm. 2016-09-06 19:16:48 +00:00
lib [PowerPC] Fix address-offset folding for plain addi 2016-09-07 07:36:11 +00:00
projects Remove autoconf support 2016-01-26 21:29:08 +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] Connecting check-all and test-depends targets correctly 2016-09-01 18:26:01 +00:00
test [PowerPC] Fix address-offset folding for plain addi 2016-09-07 07:36:11 +00:00
tools [opt] Remove an unused argument to runPassPipeline(). 2016-09-07 00:48:47 +00:00
unittests Formatting with clang-format patch r280700 2016-09-06 17:03:02 +00:00
utils [lit] Downgrade error to warning on gtest crashes during discovery. 2016-09-05 20:53:14 +00:00
.arcconfig Upgrade all the .arcconfigs to https. 2016-07-14 13:15:37 +00:00
.clang-format
.clang-tidy Don't use misc-unused-parameters check on LLVM. 2016-04-13 08:58:52 +00:00
.gitignore gitignore: ignore VS Code editor files 2016-09-02 22:54:26 +00:00
CMakeLists.txt Try to fix a circular dependency in the modules build. 2016-09-06 20:16:19 +00:00
CODE_OWNERS.TXT CODE_OWNERS: bring my entry up to date 2016-09-05 17:42:46 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Shamelessly add myself to CREDITS.TXT 2016-08-04 16:28:22 +00:00
LICENSE.TXT Remove autoconf references from LICENSE.TXT 2016-08-12 20:11:03 +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 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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