cfgrtl: Fix up -g vs. -g0 code generation -flto differences in fixup_reorder_chain...

This is similar to PR104237 and similarly to that, no testcase included
for the testsuite, as we don't have a framework to compile/link with
-g -flto and -g0 -flto and compare -fdump-final-insns= results from
the lto1 compilations.

With -flto, whether two location_t compare equal or not and just
express the same location is a lottery.

2022-03-02  Jakub Jelinek  <jakub@redhat.com>

	PR rtl-optimization/104589
	* cfgrtl.cc (fixup_reorder_chain): Use loc_equal instead of direct
	INSN_LOCATION comparison with goto_locus.

diff --git a/gcc/cfgrtl.cc b/gcc/cfgrtl.cc
index 5675751..74ea14e 100644 (file)
--- a/gcc/cfgrtl.cc
+++ b/gcc/cfgrtl.cc
@@ -4090,7 +4090,7 @@ fixup_reorder_chain (void)
                     && (!NONDEBUG_INSN_P (insn) || !INSN_HAS_LOCATION (insn)))
                insn = PREV_INSN (insn);
              if (insn != end
-                 && INSN_LOCATION (insn) == e->goto_locus)
+                 && loc_equal (INSN_LOCATION (insn), e->goto_locus))
                continue;
              if (simplejump_p (BB_END (e->src))
                  && !INSN_HAS_LOCATION (BB_END (e->src)))
@@ -4112,7 +4112,7 @@ fixup_reorder_chain (void)
                  while (insn != end && !NONDEBUG_INSN_P (insn))
                    insn = NEXT_INSN (insn);
                  if (insn != end && INSN_HAS_LOCATION (insn)
-                     && INSN_LOCATION (insn) == e->goto_locus)
+                     && loc_equal (INSN_LOCATION (insn), e->goto_locus))
                    continue;
                }
              nb = split_edge (e);