Duncan Sands
f72cfa961d
Have SimplifyBinOp dispatch Xor, Add and Sub to the corresponding methods
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(they had just been forgotten before). Adding Xor causes "main" in the
existing testcase 2010-11-01-lshr-mask.ll to be hugely more simplified.
llvm-svn: 122245
2010-12-20 14:47:04 +00:00
Dan Gohman
3d9fc7db03
Really check that the bits that will become zero are actually already zero
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before eliminating the operation that zeros them. This fixes rdar://8739316.
llvm-svn: 121353
2010-12-09 02:52:17 +00:00
Owen Anderson
47f0efad86
When folding away a (shl (shr)) pair, we need to check that the bits that will BECOME the low
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bits are zero, not that the current low bits are zero. Fixes <rdar://problem/8606771>.
llvm-svn: 117953
2010-11-01 21:08:20 +00:00
