Compared to the optimized code with branch conditions never frozen,
limiting the type of freeze's operand causes generation of suboptimal code in
some cases.
I would like to suggest removing the constraint, as this patch does.
If the number of freeze instructions becomes significant, this can be revisited.
Differential Revision: https://reviews.llvm.org/D84949
This patch makes JumpThreading fold br(freeze(undef)) if the freeze instruction
is only used by the branch.
Reviewed By: efriedma
Differential Revision: https://reviews.llvm.org/D84818
This patch adds a basic support for freeze instruction to JumpThreading
by making ComputeValueKnownInPredecessorsImpl look into its operand.
Reviewed By: efriedma, nikic
Differential Revision: https://reviews.llvm.org/D84598
Juneyoung Lee