This fixes lack of bb_loop_depth info in some of the early parts of
ira, which has been the case for quite some time. All active branches
return 0 from bb_loop_depth() in update_equiv_regs, but whether that
actually causes mis-optimization anywhere but trunk is yet to be
determined.
I played a little with trying to consolidate this loop_optimizer_init
call with one that occurs a little later, but ran into ICEs. (We now
have four calls to loop_optimizer_init in ira.c.)
Bootstrapped and regression tested powerpc64le-linux and x86_64-linux.
OK to apply?
PR rtl-optimization/71275
* ira.c (ira): Call loop_optimizer_init to set up bb_loop_depth
for update_equiv_regs and combine_and_move_insns.
diff --git a/gcc/ira.c b/gcc/ira.c
index 55b4bd7..1b269ea 100644
--- a/gcc/ira.c
+++ b/gcc/ira.c
@@ -5171,6 +5171,7 @@ ira (FILE *f)
ira_set_pseudo_classes (true, ira_dump_file);
init_alias_analysis ();
+ loop_optimizer_init (AVOID_CFG_MODIFICATIONS);
reg_equiv = XCNEWVEC (struct equivalence, max_reg_num ());
update_equiv_regs ();
@@ -5186,6 +5187,7 @@ ira (FILE *f)
if (optimize)
add_store_equivs ();
+ loop_optimizer_finalize ();
end_alias_analysis ();
free (reg_equiv);
--
Alan Modra
Australia Development Lab, IBM
