tree 339fe66ab49abd9c703ce794dbb43ef8dab331c3
parent 05f7051a703dabd941f474762e3f3f833795fc63
author Craig Topper <craig.topper@intel.com> 1529469125 +0000
committer Craig Topper <craig.topper@intel.com> 1529469125 +0000

[SelectionDAG] Don't crash on inline assembly errors when the inline assembly return type is a struct.

Summary:
If we get an error building the SelectionDAG for inline assembly we try to continue and still build the DAG.

But if the return type for the inline assembly is a struct we end up crashing because we try to create an UNDEF node with a struct type which isn't valid.

Instead we need to create an UNDEF for each element of the struct and join them with merge_values.

This patch relies on single operand merge_values being handled gracefully by getMergeValues. If the return type is void there will be no VTs returned by ComputeValueVTs and now we just return instead of calling setValue. Hopefully that's ok, I assumed nothing would need to look up the mapped value for void node.

Fixes PR37359

Reviewers: rengolin, rovka, echristo, efriedma, bogner

Reviewed By: efriedma

Subscribers: craig.topper, llvm-commits

Differential Revision: https://reviews.llvm.org/D46560

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335093 91177308-0d34-0410-b5e6-96231b3b80d8