Commit message (Collapse) | Author | Age | Files | Lines | |
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* | [SelectionDAG] swap select_cc operands to enable folding | Alexandros Lamprineas | 2018-11-09 | 1 | -0/+54 |
The DAGCombiner tries to SimplifySelectCC as follows: select_cc(x, y, 16, 0, cc) -> shl(zext(set_cc(x, y, cc)), 4) It can't cope with the situation of reordered operands: select_cc(x, y, 0, 16, cc) In that case we just need to swap the operands and invert the Condition Code: select_cc(x, y, 16, 0, ~cc) Differential Revision: https://reviews.llvm.org/D53236 llvm-svn: 346484 |