The following patch should fix PR
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70025
The patch was successfully bootstrapped and tested on x86/x86-64.
Committed as rev. 233876.
I'll work on the test tomorrow -- I have no access to s390x right now.
Index: ChangeLog
===================================================================
--- ChangeLog (revision 233875)
+++ ChangeLog (working copy)
@@ -1,3 +1,9 @@
+2016-03-01 Vladimir Makarov <vmaka...@redhat.com>
+
+ PR middle-end/70025
+ * lra-constraints.c (regno_val_use_in): New.
+ (match_reload): Use it instead of regno_use_in.
+
2016-03-01 Eric Botcazou <ebotca...@adacore.com>
PR rtl-optimization/70007
Index: lra-constraints.c
===================================================================
--- lra-constraints.c (revision 233861)
+++ lra-constraints.c (working copy)
@@ -840,6 +840,36 @@ narrow_reload_pseudo_class (rtx reg, enu
lra_change_class (REGNO (reg), rclass, " Change to", true);
}
+/* Searches X for any reference to a reg with the same value as REGNO,
+ returning the rtx of the reference found if any. Otherwise,
+ returns NULL_RTX. */
+static rtx
+regno_val_use_in (unsigned int regno, rtx x)
+{
+ const char *fmt;
+ int i, j;
+ rtx tem;
+
+ if (REG_P (x) && lra_reg_info[REGNO (x)].val == lra_reg_info[regno].val)
+ return x;
+
+ fmt = GET_RTX_FORMAT (GET_CODE (x));
+ for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--)
+ {
+ if (fmt[i] == 'e')
+ {
+ if ((tem = regno_val_use_in (regno, XEXP (x, i))))
+ return tem;
+ }
+ else if (fmt[i] == 'E')
+ for (j = XVECLEN (x, i) - 1; j >= 0; j--)
+ if ((tem = regno_val_use_in (regno , XVECEXP (x, i, j))))
+ return tem;
+ }
+
+ return NULL_RTX;
+}
+
/* Generate reloads for matching OUT and INS (array of input operand
numbers with end marker -1) with reg class GOAL_CLASS. Add input
and output reloads correspondingly to the lists *BEFORE and *AFTER.
@@ -942,7 +972,8 @@ match_reload (signed char out, signed ch
= (! early_clobber_p && 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))
- && (out < 0 || regno_use_in (REGNO (in_rtx), out_rtx) == NULL_RTX)
+ && (out < 0
+ || regno_val_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, ""));
