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2012-08-30It is illegal to transform (sdiv (ashr X c1) c2) -> (sdiv x (2^c1 * c2)),Nadav Rotem
because C always rounds towards zero. Thanks Dirk and Ben. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162899 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-28InstCombine: Guard the transform introduced in r162743 against large ints ↵Benjamin Kramer
and non-const shifts. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162751 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-28Make sure that we don't call getZExtValue on values > 64 bits.Nadav Rotem
Thanks Benjamin for noticing this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162749 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-28Teach InstCombine to canonicalize [SU]div+[AL]shl patterns.Nadav Rotem
For example: %1 = lshr i32 %x, 2 %2 = udiv i32 %1, 100 rdar://12182093 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162743 91177308-0d34-0410-b5e6-96231b3b80d8
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