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InstSimplify: Improve handling of ashr/lshr
authorDavid Majnemer <david.majnemer@gmail.com>
Fri, 16 May 2014 17:14:03 +0000 (17:14 +0000)
committerDavid Majnemer <david.majnemer@gmail.com>
Fri, 16 May 2014 17:14:03 +0000 (17:14 +0000)
commit3258443195f7574206dd90f7a67959a252737c51
tree46d2a9338d1adb9c74caa9b7523f1ee1d5800d25tree | snapshot
parent7a2ed26563512149ea03e56d8ecd92c884c32f8fcommit | diff
InstSimplify: Improve handling of ashr/lshr

Summary:
Analyze the range of values produced by ashr/lshr cst, %V when it is
being used in an icmp.

Reviewers: nicholas

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D3774

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209000 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Analysis/InstructionSimplify.cpp diff | blob | history
test/Transforms/InstSimplify/compare.ll diff | blob | history
C/C++ LLVM-based compilers that forbids OOTA behaviors