tree cb1f165a84c8ce5a9069e03bf0054f42e5d00c07
parent 87e4eb4492701426a02f5fcf460bb0b6d432d2b7
author Andrew Pinski <andrew.pinski@oss.qualcomm.com> 1778732683 -0700
committer Andrew Pinski <andrew.pinski@oss.qualcomm.com> 1778870478 -0700

tree-cfg: Revert part of r8-546 [PR125290]

This reverts the group_case_labels_stmt part of r8-546-gca4d2851687875.
This is placed in the wrong location to remove the case statements that go
directly to __builtin_unreachable. In fact the removal of the case statements
make us lose optimizations in some cases (Wuninitialized-pr107919-1.C for one).

Also this fixes PR 125290 by no longer leaving around a switch which just
has a default case.

Bootstrapped and tested on x86_64-linux-gnu.

	PR tree-optimization/125290

gcc/ChangeLog:

	* tree-cfg.cc (group_case_labels_stmt): Remove code that was
	added to remove `cases` that goto blocks of unreachable.
	* tree-ssa-forwprop.cc (optimize_unreachable): Remove the
	comment about switch cases being handled.

gcc/testsuite/ChangeLog:

	* g++.dg/warn/Wuninitialized-pr107919-1.C: Remove xfail.
	* gcc.dg/analyzer/taint-assert.c: Update for the non-removal
	of block containing unreachable.
	* gcc.dg/torture/pr125290-1.c: New test.

Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>