A recent patch for PR70478 introduced a regression on ARM. Here is an
additional patch to fix it.
The patch was successfully tested and bootstrapped on x86-64.
Committed as rev. 246854.
Index: ChangeLog
===================================================================
--- ChangeLog (revision 246853)
+++ ChangeLog (working copy)
@@ -1,3 +1,9 @@
+2017-04-11 Vladimir Makarov <vmaka...@redhat.com>
+
+ PR rtl-optimization/70478
+ * lra-constraints.c (process_alt_operands): Check memory for
+ disfavoring memory insn operand.
+
2017-04-11 Jakub Jelinek <ja...@redhat.com>
PR middle-end/80100
Index: lra-constraints.c
===================================================================
--- lra-constraints.c (revision 246808)
+++ lra-constraints.c (working copy)
@@ -2722,12 +2722,14 @@ process_alt_operands (int only_alternati
}
}
- /* When we use memory operand, the insn should read the
- value from memory and even if we just wrote a value
- into the memory it is costly in comparison with an
- insn alternative which does not use memory
- (e.g. register or immediate operand). */
- if (no_regs_p && offmemok)
+ /* When we use an operand requiring memory in given
+ alternative, the insn should write *and* read the
+ value to/from memory it is costly in comparison with
+ an insn alternative which does not use memory
+ (e.g. register or immediate operand). We exclude
+ memory operand for such case as we can satisfy the
+ memory constraints by reloading address. */
+ if (no_regs_p && offmemok && !MEM_P (op))
{
if (lra_dump_file != NULL)
fprintf
