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(parent: bc8858c) | patch
Make 91378 more conservative.
authorEvan Cheng <evan.cheng@apple.com>
Tue, 15 Dec 2009 03:00:32 +0000 (03:00 +0000)
committerEvan Cheng <evan.cheng@apple.com>
Tue, 15 Dec 2009 03:00:32 +0000 (03:00 +0000)
commit9818c043d2ef1be70780de92bb42edd53d1da62a
treedce080d6fe7af6bcf4d4b1bc2eda60cb09be32dbtree | snapshot
parentbc8858c3b058bbee5a1a1fd5950050cf610fd507commit | diff
Make 91378 more conservative.
1. Only perform (zext (shl (zext x), y)) -> (shl (zext x), y) when y is a constant. This makes sure it remove at least one zest.
2. If the shift is a left shift, make sure the original shift cannot shift out bits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91399 91177308-0d34-0410-b5e6-96231b3b80d8
lib/CodeGen/SelectionDAG/DAGCombiner.cpp diff | blob | history
test/CodeGen/X86/zext-shl.ll diff | blob | history
C/C++ LLVM-based compilers that forbids OOTA behaviors