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(parent: 1c61990) | patch
When pattern matching during instruction selection make sure shl x,1 is not
authorChad Rosier <mcrosier@apple.com>
Tue, 14 Jun 2011 22:29:10 +0000 (22:29 +0000)
committerChad Rosier <mcrosier@apple.com>
Tue, 14 Jun 2011 22:29:10 +0000 (22:29 +0000)
commit92bcd96bbcf42911a76570cc0974e513bc7f261d
treef7aa5be2ae7bfc3418f06248d0efe73406e1648btree | snapshot
parent1c61990b2daa77f3444eb2b6d8157cdc805ce22fcommit | diff
When pattern matching during instruction selection make sure shl x,1 is not
converted to add x,x if x is a undef.  add undef, undef does not guarantee
that the resulting low order bit is zero.
Fixes <rdar://problem/9453156> and <rdar://problem/9487392>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133022 91177308-0d34-0410-b5e6-96231b3b80d8
lib/CodeGen/SelectionDAG/DAGCombiner.cpp diff | blob | history
test/CodeGen/X86/shl_undef.ll [new file with mode: 0644] blob
C/C++ LLVM-based compilers that forbids OOTA behaviors