Currently replaceBranchTerminator/removeUninterestingBBsFromSwitch
always creates `ret void` instructions if no successor is in the chunk.
This results in invalid IR for functions with non-void return types,
which makes those reductions unfeasible. Instead, create `ret ty undef`
for functions with non-void return types.
Reviewed By: lebedev.ri
Differential Revision: https://reviews.llvm.org/D86849
Terminator may have returned value, so we need to replace uses,
and in general handle invoke as a branch inst.
I'm not sure this is the best handling, but IMO poorly reduced
input is much better than crashing reduction tool.
A (previously-crashing!) test added.
Fixes https://bugs.llvm.org/show_bug.cgi?id=46818
Summary:
I think, this results in much more understandable/readable flow.
At least the original logic was perhaps the most hard thing for me to grasp when taking an initial look on the delta passes.
Reviewers: nickdesaulniers, dblaikie, diegotf, george.burgess.iv
Reviewed By: nickdesaulniers
Subscribers: llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D83287
Florian Hahn