Eli Friedman
c6b8ba8673
Fix an infinite loop where a transform in InstCombiner::visitAnd claims a construct is changed when it is not. (See included testcase.)
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Patch by Xiaoyi Guo.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140072 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-19 21:58:15 +00:00
Anders Carlsson
d70be0b2c1
Make InstCombiner::FoldAndOfICmps create a ConstantRange that's the
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intersection of the LHS and RHS ConstantRanges and return "false" when
the range is empty.
This simplifies some code and catches some extra cases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126744 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-01 15:05:01 +00:00
Benjamin Kramer
6844c8ea5a
Teach InstructionSimplify to fold (A & B) & A -> A & B and (A | B) | A -> A | B.
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Reassociate does this but it doesn't catch all cases (e.g. if the operands are i1).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113651 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-10 22:39:55 +00:00
Chris Lattner
2e1cdbf92d
convert to filecheck.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95854 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-11 06:24:37 +00:00
Dan Gohman
3e054fe9ef
Use opt -S instead of piping bitcode output through llvm-dis.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81257 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-08 22:34:10 +00:00
Dan Gohman
b1e1e82c54
Change these tests to feed the assembly files to opt directly, instead
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of using llvm-as, now that opt supports this.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81226 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-08 16:50:01 +00:00
Chris Lattner
99c65745a2
Implement a couple of foldings for ordered and unordered comparisons,
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implementing cases related to PR1738.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43289 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-24 05:38:08 +00:00
