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Hiroshi Yamauchi a7d6028861 [InstCombine] Simplify pointer difference subtractions (GEP-GEP) where GEPs have other uses and one non-constant index 
Summary:
Pointer difference simplifications currently happen only if input GEPs don't have other uses or their indexes are all constants, to avoid duplicating indexing arithmetic.

This patch enables cases with exactly one non-constant index among input GEPs to happen where there is no duplicated arithmetic or code size increase even if input GEPs have other uses.

For example, this patch allows "(&A[42][i]-&A[42][0])" --> "i", which didn't happen previously, if the input GEP(s) have other uses.

Reviewers: sanjoy, bkramer

Reviewed By: sanjoy

Subscribers: mcrosier, llvm-commits

Differential Revision: https://reviews.llvm.org/D35499

llvm-svn: 309304
2017-07-27 18:27:11 +00:00
bindings [NFC] Remove multiple semicolons 2017-06-28 23:15:16 +00:00
cmake Remove check for i686. 2017-07-27 01:16:19 +00:00
docs [docs] change a few code-blocks to llvm from text 2017-07-26 14:11:23 +00:00
examples Defeat another -Wunused-but-set-variable warning 2017-07-19 15:06:31 +00:00
include [InstCombine] Simplify pointer difference subtractions (GEP-GEP) where GEPs have other uses and one non-constant index 2017-07-27 18:27:11 +00:00
lib [InstCombine] Simplify pointer difference subtractions (GEP-GEP) where GEPs have other uses and one non-constant index 2017-07-27 18:27:11 +00:00
projects
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runtimes [CMake] Remove redundant logic in runtimes/CMakeList.txt 2017-07-24 17:26:28 +00:00
test [InstCombine] Simplify pointer difference subtractions (GEP-GEP) where GEPs have other uses and one non-constant index 2017-07-27 18:27:11 +00:00
tools Revert "Reland "[LLVM][llvm-objcopy] Added basic plumbing to get things started"" 2017-07-27 06:02:05 +00:00
unittests [TargetParser] Use enum classes for various ARM kind enums. 2017-07-27 16:27:56 +00:00
utils [lit] Fix order of checks in shtest-shell.py test 2017-07-27 16:50:40 +00:00
.arcconfig
.clang-format
.clang-tidy
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CMakeLists.txt [Modules] Rework r274270. Let Clang targets depend on intrinsics_gen. 2017-07-23 05:09:44 +00:00
CODE_OWNERS.TXT Remove the BBVectorize pass. 2017-06-30 07:09:08 +00:00
configure
CREDITS.TXT Another test commit 2017-07-01 03:24:06 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt
RELEASE_TESTERS.TXT [RelTest] Diana is doing both releases now 2017-07-14 08:33:52 +00:00

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