commit	0b59103a73bf982deeebf943daa1846acf709e1f	[log] [tgz]
author	Sanjay Patel <spatel@rotateright.com>	Mon Jul 08 16:26:48 2019 +0000
committer	Sanjay Patel <spatel@rotateright.com>	Mon Jul 08 16:26:48 2019 +0000
tree	455cfa23cbc230d68588f3c8a7ba3d3df2cde40f
parent	e6ba22542f28396aa13bd37b42419e2028288a7f [diff]

[InstCombine] canonicalize insert+splat to/from element 0 of vector

We recognize a splat from element 0 in (VectorUtils) llvm::getSplatValue()
and also in ShuffleVectorInst::isZeroEltSplatMask(), so this converts
to that form for better matching.

The backend generically turns these patterns into build_vector,
so there should be no codegen difference.

llvm-svn: 365342

llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp[diff]
llvm/test/Transforms/InstCombine/insert-extract-shuffle.ll[diff]

2 files changed

tree: 455cfa23cbc230d68588f3c8a7ba3d3df2cde40f

clang/
clang-tools-extra/
compiler-rt/
debuginfo-tests/
libclc/
libcxx/
libcxxabi/
libunwind/
lld/
lldb/
llgo/
llvm/
openmp/
parallel-libs/
polly/
pstl/
.arcconfig
.clang-format
.clang-tidy
.gitignore
README.md

README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.