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[SLSR] garbage-collect unused instructions
authorJingyue Wu <jingyue@google.com>
Tue, 21 Apr 2015 19:56:18 +0000 (19:56 +0000)
committerJingyue Wu <jingyue@google.com>
Tue, 21 Apr 2015 19:56:18 +0000 (19:56 +0000)
commit423476d899034075c2e1c6a03b8d1894bcfe0ff1
tree08cbf2b3815fe0d23e314664ae392cc2507cee23tree | snapshot
parent412b6fc7b9cd7b331ec032aaedd8dcd337b0a111commit | diff
[SLSR] garbage-collect unused instructions

Summary:
After we rewrite a candidate, the instructions used by the old form may
become unused. This patch cleans up these unused instructions so that we
needn't run DCE after SLSR.

Test Plan: removed -dce in all the SLSR tests

Reviewers: broune, meheff

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D9101

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235410 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Transforms/Scalar/StraightLineStrengthReduce.cpp diff | blob | history
test/Transforms/StraightLineStrengthReduce/X86/no-slsr.ll diff | blob | history
test/Transforms/StraightLineStrengthReduce/slsr-add.ll diff | blob | history
test/Transforms/StraightLineStrengthReduce/slsr-gep.ll diff | blob | history
test/Transforms/StraightLineStrengthReduce/slsr-mul.ll diff | blob | history
C/C++ LLVM-based compilers that forbids OOTA behaviors