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* [DAGCombiner] Fold together mul and shl when both are by a constantJohn Brawn2015-08-211-0/+77
This is intended to improve code generation for GEPs, as the index value is shifted by the element size and in GEPs of multi-dimensional arrays the index of higher dimensions is multiplied by the lower dimension size. Differential Revision: http://reviews.llvm.org/D12197 llvm-svn: 245689
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