cfgrtl: Don't try to redirect asm goto to EXIT [PR108263]

The following testcase distilled from Linux kernel on ppc64le ICEs,
because fixup_reorder_chain sees a bb with a single fallthru edge
falling into a bb with simple return and decides to redirect
that fallthru edge to EXIT.  That is possible if the bb ending
in the fallthru edge doesn't end with a jump or ends with a normal
unconditional jump, but not when the bb ends with asm goto which can despite
a single fallthru have multiple labels to the fallthrough basic block.

The following patch makes sure we never try to redirect such cases to EXIT.

2023-01-03  Jakub Jelinek  <jakub@redhat.com>

	PR rtl-optimization/108263
	* cfgrtl.cc (fixup_reorder_chain): Avoid trying to redirect
	asm goto to EXIT.

	* gcc.dg/pr108263.c: New test.

0 files changed, 0 insertions, 0 deletions