https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65233
Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
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CC| |law at redhat dot com
--- Comment #14 from Jeffrey A. Law <law at redhat dot com> ---
Presumably this is a case where a block has become unreachable? Or is it a
case where the block previously had multiple preds, then by way of jump
threading we've got just a single pred and ultimately we try to merge it with
its single predecessor?
In the former case, I'd expect cleanup_tree_cfg_noloop (called from
cleanup_tree_cfg) to have removed the unreachable block(s).
Just to be clear, I'm not saying the patch is wrong, I'm just trying to
understand the events that led to a PHI with no args and whether or not it
should have already been cleaned up.
