Simon Pilgrim 9fc191fd45 [DAGCombiner] Add vector demanded elements support to ComputeNumSignBits ... Currently ComputeNumSignBits returns the minimum number of sign bits for all elements of vector data, when we may only be interested in one/some of the elements. This patch adds a DemandedElts argument that allows us to specify the elements we actually care about. The original ComputeNumSignBits implementation calls with a DemandedElts demanding all elements to match current behaviour. Scalar types set this to 1. I've only added support for BUILD_VECTOR and EXTRACT_VECTOR_ELT so far, all others will default to demanding all elements but can be updated in due course. Followup to D25691. Differential Revision: https://reviews.llvm.org/D31311 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299219 91177308-0d34-0410-b5e6-96231b3b80d8		2017-03-31 13:54:09 +00:00
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llvm	[DAGCombiner] Add vector demanded elements support to ComputeNumSignBits	2017-03-31 13:54:09 +00:00
llvm-c	Split the SimplifyCFG pass into two variants.	2017-03-26 06:44:08 +00:00