re PR target/34930 (ICE in instantiate_virtual_regs_in_insn with vector splat load)

        PR target/34930
        * function.c (instantiate_virtual_regs_in_insn): Reload address
        before falling back to reloading the whole operand.

From-SVN: r132317

gcc/ChangeLog

+2008-02-14  Michael Matz  <matz@suse.de>
+
+	PR target/34930
+	* function.c (instantiate_virtual_regs_in_insn): Reload address
+	before falling back to reloading the whole operand.
+
 2008-02-14  Andreas Krebbel  <krebbel1@de.ibm.com>
 
 	* config/s390/s390.c (s390_mainpool_start): Emit the pool

gcc/function.c

@@ -1468,6 +1468,20 @@ instantiate_virtual_regs_in_insn (rtx insn)
 
 	    start_sequence ();
 	    x = replace_equiv_address (x, addr);
+	    /* It may happen that the address with the virtual reg
+	       was valid (e.g. based on the virtual stack reg, which might
+	       be acceptable to the predicates with all offsets), whereas
+	       the address now isn't anymore, for instance when the address
+	       is still offsetted, but the base reg isn't virtual-stack-reg
+	       anymore.  Below we would do a force_reg on the whole operand,
+	       but this insn might actually only accept memory.  Hence,
+	       before doing that last resort, try to reload the address into
+	       a register, so this operand stays a MEM.  */
+	    if (!safe_insn_predicate (insn_code, i, x))
+	      {
+		addr = force_reg (GET_MODE (addr), addr);
+		x = replace_equiv_address (x, addr);
+	      }
 	    seq = get_insns ();
 	    end_sequence ();
 	    if (seq)