llvm-project/llvm
Simon Pilgrim 1c9bec727a [InstCombine] Fold (gep (oneuse(gep Ptr, Idx0)), Idx1) -> (gep Ptr, (add Idx0, Idx1)) (PR51069)
As noticed on D106352, after we've folded "(select C, (gep Ptr, Idx), Ptr) -> (gep Ptr, (select C, Idx, 0))" if the inner Ptr was also a (now one use) gep we could then merge the geps, using the sum of the indices instead.

I've limited this to basic 2-op geps - a more general case further down InstCombinerImpl.visitGetElementPtrInst doesn't have the one-use limitation but only creates the add if it can be created via SimplifyAddInst.

https://alive2.llvm.org/ce/z/f8pLfD (Thanks Roman!)

Differential Revision: https://reviews.llvm.org/D106450
2021-07-22 10:58:51 +01:00
..
benchmarks
bindings [IR] Rename `comdat noduplicates` to `comdat nodeduplicate` 2021-07-20 12:47:10 -07:00
cmake [CMake] Disable -fno-semantic-interposition for GCC<10.3 on SystemZ 2021-07-08 22:09:21 -07:00
docs [IR] Rename `comdat noduplicates` to `comdat nodeduplicate` 2021-07-20 12:47:10 -07:00
examples Opaque pointer GEP fixes for BrainF example 2021-07-18 18:25:54 -07:00
include [clang] Use i64 for the !srcloc metadata on asm IR nodes. 2021-07-22 10:24:52 +01:00
lib [InstCombine] Fold (gep (oneuse(gep Ptr, Idx0)), Idx1) -> (gep Ptr, (add Idx0, Idx1)) (PR51069) 2021-07-22 10:58:51 +01:00
projects [RFC][debuginfo-test] Rename debug-info lit tests for general purposes 2021-06-28 11:31:40 +01:00
resources
runtimes
test [InstCombine] Fold (gep (oneuse(gep Ptr, Idx0)), Idx1) -> (gep Ptr, (add Idx0, Idx1)) (PR51069) 2021-07-22 10:58:51 +01:00
tools [llvm][tools] Hide remaining unrelated llvm- tool options 2021-07-22 09:47:55 +02:00
unittests [OpenMP] Change `__kmpc_free_shared` to include the paired allocation size 2021-07-21 20:56:21 -04:00
utils [gn build] Port 74fd3cb8cd 2021-07-21 21:45:33 +00:00
.clang-format
.clang-tidy
.gitattributes
.gitignore
CMakeLists.txt [MLGO] Use binary protobufs for improved training performance. 2021-07-19 13:59:28 -07:00
CODE_OWNERS.TXT [NFC] Update code owners file 2021-07-20 11:29:10 -07:00
CREDITS.TXT
LICENSE.TXT
README.txt
RELEASE_TESTERS.TXT
configure
llvm.spec.in

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