tree dd03f43a2a4aca90826d6c37f298bcad81d4102c
parent ad21d2d0af086c7d641d0eb71ce9a500be255f9b
author Sam Parker <sam.parker@arm.com> 1547628012 +0000
committer Sam Parker <sam.parker@arm.com> 1547628012 +0000

[DAGCombine] Fix ReduceLoadWidth for shifted offsets

ReduceLoadWidth can trigger using a shifted mask is used and this
requires that the function return a shl node to correct for the
offset. However, the way that this was implemented meant that the
returned result could be an existing node, which would be incorrect.
This fixes the method of inserting the new node and replacing uses.

Differential Revision: https://reviews.llvm.org/D50432


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351310 91177308-0d34-0410-b5e6-96231b3b80d8