This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
a patch for PR61578
- From: Vladimir Makarov <vmakarov at redhat dot com>
- To: gcc-patches <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 25 Sep 2015 17:12:49 -0400
- Subject: a patch for PR61578
- Authentication-results: sourceware.org; auth=none
The following patch is for s390 regression introduced by the first patch
for PR61578:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61578
The patch was bootstrapped and tested on x86-64.
Committed as rev. 228154.
2015-09-25 Vladimir Makarov <vmakarov@redhat.com>
PR target/61578
* lra-constarints.c (match_reload): Check presence of the input
pseudo
in the output operand.
Index: lra-constraints.c
===================================================================
--- lra-constraints.c (revision 228097)
+++ lra-constraints.c (working copy)
@@ -945,6 +945,12 @@ match_reload (signed char out, signed ch
= (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, ""));