Hi! The following testcase ICEs on s390x. The problem is that the bbpart pass calls df_set_flags (DF_DEFER_INSN_RESCAN); because it wants to defer rescanning, but doesn't actually df_finish_pass (it does in one case, but then calls df_set_flags with another changeable flag, so it has the same issue), and if the IRA pass is invoked soon after it without any df_finish_pass calls in between, we end up with deferred insn rescanning during IRA which heavily relies on immediate insn rescanning.
Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk? 2017-08-03 Jakub Jelinek <ja...@redhat.com> PR target/81621 * bb-reorder.c (pass_partition_blocks::execute): Return TODO_df_finish after setting changeable df flags. * gcc.dg/pr81621.c: New test. --- gcc/bb-reorder.c.jj 2017-07-21 10:28:13.000000000 +0200 +++ gcc/bb-reorder.c 2017-08-02 19:43:58.797243254 +0200 @@ -2904,7 +2904,7 @@ pass_partition_blocks::execute (function crossing_edges = find_rarely_executed_basic_blocks_and_crossing_edges (); if (!crossing_edges.exists ()) - return 0; + return TODO_df_finish; crtl->has_bb_partition = true; @@ -2970,7 +2970,7 @@ pass_partition_blocks::execute (function df_analyze (); } - return 0; + return TODO_df_finish; } } // anon namespace --- gcc/testsuite/gcc.dg/pr81621.c.jj 2017-08-02 19:52:08.435831121 +0200 +++ gcc/testsuite/gcc.dg/pr81621.c 2017-08-02 19:52:00.026924067 +0200 @@ -0,0 +1,5 @@ +/* PR target/81621 */ +/* { dg-do compile { target freorder } } */ +/* { dg-options "-Og -fno-split-wide-types -freorder-blocks-and-partition" } */ + +#include "graphite/scop-10.c" Jakub