https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61578
--- Comment #35 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
Looks like the extra condition in that patch is still not good enough:
--- a/gcc/lra-constraints.c
+++ b/gcc/lra-constraints.c
@@ -945,6 +945,12 @@ match_reload (signed char out, signed char *ins, enum
reg_c
= (ins[1] < 0 && REG_P (in_rtx)
&& (int) REGNO (in_rtx) < lra_new_regno_start
&& find_regno_note (curr_insn, REG_DEAD, REGNO (in_rtx))
+ /* We can not use the same value if the pseudo is mentioned
+ in the output, e.g. as an address part in memory,
+ becuase output reload will actually extend the pseudo
+ liveness. We don't care about eliminable hard regs here
+ as we are interesting only in pseudos. */
+ && (out < 0 || regno_use_in (REGNO (in_rtx), out_rtx) == NULL_RTX)
? lra_create_new_reg (inmode, in_rtx, goal_class, "")
: lra_create_new_reg_with_unique_value (outmode, out_rtx,
goal_class, ""));
