https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107057
--- Comment #5 from Hongtao.liu <crazylht at gmail dot com> ---
I'm testing
modified gcc/lra-constraints.cc
@@ -4382,7 +4382,14 @@ curr_insn_transform (bool check_only_p)
(op, (enum reg_class) goal_alt[i]) == NO_REGS)
|| no_input_reloads_p))
{
- rtx tem = force_const_mem (mode, op);
+ rtx tem;
+
+ /* PR 107057, for same constant pool, don't bother
+ force_const_mem again, just reuse the matched op. */
+ if (goal_alt_matches[i] >= 0)
+ tem = *curr_id->operand_loc[goal_alt_matches[i]];
+ else
+ tem = force_const_mem (mode, op);
change_p = true;
if (subreg != NULL_RTX)
