commit 238ea13cca75ad499f227b60a95c40174c6caf78
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date: Wed Jan 27 14:53:28 2021 -0500
[PR97684] IRA: Recalculate pseudo classes if we added new pseduos since last calculation before updating equiv regs
update_equiv_regs can use reg classes of pseudos and they are set up in
register pressure sensitive scheduling and loop invariant motion and in
live range shrinking. This info can become obsolete if we add new pseudos
since the last set up. Recalculate it again if the new pseudos were
added.
gcc/ChangeLog:
PR rtl-optimization/97684
* ira.c (ira): Call ira_set_pseudo_classes before
update_equiv_regs when it is necessary.
gcc/testsuite/ChangeLog:
PR rtl-optimization/97684
* gcc.target/i386/pr97684.c: New.
@@ -5566,6 +5566,15 @@ ira (FILE *f)
if (warn_clobbered)
generate_setjmp_warnings ();
+ /* update_equiv_regs can use reg classes of pseudos and they are set up in
+ register pressure sensitive scheduling and loop invariant motion and in
+ live range shrinking. This info can become obsolete if we add new pseudos
+ since the last set up. Recalculate it again if the new pseudos were
+ added. */
+ if (resize_reg_info () && (flag_sched_pressure || flag_live_range_shrinkage
+ || flag_ira_loop_pressure))
+ 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 ());
@@ -5610,9 +5619,6 @@ ira (FILE *f)
regstat_recompute_for_max_regno ();
}
- if (resize_reg_info () && flag_ira_loop_pressure)
- ira_set_pseudo_classes (true, ira_dump_file);
-
setup_reg_equiv ();
grow_reg_equivs ();
setup_reg_equiv_init ();
new file mode 100644
@@ -0,0 +1,24 @@
+/* PR rtl-optimization/97684 */
+/* { dg-do compile } */
+/* { dg-options "-O1 -flive-range-shrinkage -fschedule-insns -fselective-scheduling -funroll-all-loops -fno-web" } */
+
+void
+c5 (double);
+
+void
+g4 (int *n4)
+{
+ double lp = 0.0;
+ int fn;
+
+ for (fn = 0; fn < 18; ++fn)
+ {
+ int as;
+
+ as = __builtin_abs (n4[fn]);
+ if (as > lp)
+ lp = as;
+ }
+
+ c5 (lp);
+}