Silence warnings on uminsi3, umaxsi3.

From-SVN: r9100

gcc/config/rs6000/rs6000.md

@@ -936,9 +936,9 @@
 
 (define_expand "uminsi3"
   [(set (match_dup 3) (xor:SI (match_operand:SI 1 "gpc_reg_operand" "")
-			      (const_int -2147483648)))
+			      (match_dup 5)))
    (set (match_dup 4) (xor:SI (match_operand:SI 2 "gpc_reg_operand" "")
-			      (const_int -2147483648)))
+			      (match_dup 5)))
    (set (match_dup 3) (if_then_else:SI (gt (match_dup 3) (match_dup 4))
 				       (const_int 0)
 				       (minus:SI (match_dup 4) (match_dup 3))))
@@ -946,13 +946,17 @@
 	(minus:SI (match_dup 2) (match_dup 3)))]
   "TARGET_POWER"
   "
-{ operands[3] = gen_reg_rtx (SImode);  operands[4] = gen_reg_rtx (SImode); }")
+{
+  operands[3] = gen_reg_rtx (SImode);
+  operands[4] = gen_reg_rtx (SImode);
+  operands[5] = GEN_INT (-2147483647 - 1);
+}")
 
 (define_expand "umaxsi3"
   [(set (match_dup 3) (xor:SI (match_operand:SI 1 "gpc_reg_operand" "")
-			      (const_int -2147483648)))
+			      (match_dup 5)))
    (set (match_dup 4) (xor:SI (match_operand:SI 2 "gpc_reg_operand" "")
-			      (const_int -2147483648)))
+			      (match_dup 5)))
    (set (match_dup 3) (if_then_else:SI (gt (match_dup 3) (match_dup 4))
 				       (const_int 0)
 				       (minus:SI (match_dup 4) (match_dup 3))))
@@ -960,7 +964,11 @@
 	(plus:SI (match_dup 3) (match_dup 1)))]
   "TARGET_POWER"
   "
-{ operands[3] = gen_reg_rtx (SImode);  operands[4] = gen_reg_rtx (SImode); }")
+{
+  operands[3] = gen_reg_rtx (SImode);
+  operands[4] = gen_reg_rtx (SImode);
+  operands[5] = GEN_INT (-2147483647 - 1);
+}")
 
 (define_insn ""
   [(set (match_operand:SI 0 "gpc_reg_operand" "=r")