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(parent: 89db49f) | patch
InstSimplify: [al]shr exact undef, %X -> undef
authorDavid Majnemer <david.majnemer@gmail.com>
Wed, 10 Dec 2014 09:14:52 +0000 (09:14 +0000)
committerDavid Majnemer <david.majnemer@gmail.com>
Wed, 10 Dec 2014 09:14:52 +0000 (09:14 +0000)
commit6578f1beb1a5c0f94958bfe68b866658e26eef08
treeafff3ea0d027a4078d8044b825a58fe9d56c680ftree | snapshot
parent89db49fb9b078c3442c1fee6c1385760c7287bfdcommit | diff
InstSimplify: [al]shr exact undef, %X -> undef

Exact shifts always keep the non-zero bits of their input.  This means
it keeps it's undef bits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223923 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Analysis/InstructionSimplify.cpp diff | blob | history
test/Transforms/InstSimplify/undef.ll diff | blob | history
C/C++ LLVM-based compilers that forbids OOTA behaviors