tree 691202d0aef81a6dd78eaaefa5faf1cb6afc57cb
parent 84f2271acd818e50c598fef7ce9586e7ee0ac553
author Simon Pilgrim <llvm-dev@redking.me.uk> 1554476181 +0000
committer Simon Pilgrim <llvm-dev@redking.me.uk> 1554476181 +0000

[SelectionDAG] Add fcmp UNDEF handling to SelectionDAG::FoldSetCC

Second half of PR40800, this patch adds DAG undef handling to fcmp instructions to match the behavior in llvm::ConstantFoldCompareInstruction, this permits constant folding of vector comparisons where some elements had been reduced to UNDEF (by SimplifyDemandedVectorElts etc.).

This involves a lot of tweaking to reduced tests as bugpoint loves to reduce fcmp arguments to undef........

Differential Revision: https://reviews.llvm.org/D60006

llvm-svn: 357765