rs6000: Remove "O" alternative from lshrsi3

Nothing will ever generate RTL matching this alternative.  Maybe long
ago this was needed, but not anymore.

From-SVN: r211875

gcc/ChangeLog

+2014-06-22  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config/rs6000/rs6000.md (lshrsi3, and its two dot patterns):
+	Remove "O" alternative.
+
 2014-06-22  Richard Sandiford  <rdsandiford@googlemail.com>
 
 	* config/mips/mips.c (mips_move_to_gpr_cost): Remove mode argument.

gcc/config/rs6000/rs6000.md

@@ -4543,16 +4543,15 @@
   "")
 
 (define_insn "lshrsi3"
-  [(set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r")
-	(lshiftrt:SI (match_operand:SI 1 "gpc_reg_operand" "r,r,r")
-		     (match_operand:SI 2 "reg_or_cint_operand" "O,r,i")))]
+  [(set (match_operand:SI 0 "gpc_reg_operand" "=r,r")
+	(lshiftrt:SI (match_operand:SI 1 "gpc_reg_operand" "r,r")
+		     (match_operand:SI 2 "reg_or_cint_operand" "r,i")))]
   ""
   "@
-  mr %0,%1
   srw %0,%1,%2
   srwi %0,%1,%h2"
-  [(set_attr "type" "integer,shift,shift")
-   (set_attr "var_shift" "no,yes,no")])
+  [(set_attr "type" "shift")
+   (set_attr "var_shift" "yes,no")])
 
 (define_insn "*lshrsi3_64"
   [(set (match_operand:DI 0 "gpc_reg_operand" "=r,r")
@@ -4567,23 +4566,21 @@
    (set_attr "var_shift" "yes,no")])
 
 (define_insn ""
-  [(set (match_operand:CC 0 "cc_reg_operand" "=x,x,x,?y,?y,?y")
-	(compare:CC (lshiftrt:SI (match_operand:SI 1 "gpc_reg_operand" "r,r,r,r,r,r")
-				 (match_operand:SI 2 "reg_or_cint_operand" "O,r,i,O,r,i"))
+  [(set (match_operand:CC 0 "cc_reg_operand" "=x,x,?y,?y")
+	(compare:CC (lshiftrt:SI (match_operand:SI 1 "gpc_reg_operand" "r,r,r,r")
+				 (match_operand:SI 2 "reg_or_cint_operand" "r,i,r,i"))
 		    (const_int 0)))
-   (clobber (match_scratch:SI 3 "=X,r,r,X,r,r"))]
+   (clobber (match_scratch:SI 3 "=r,r,r,r"))]
   "TARGET_32BIT"
   "@
-   mr. %1,%1
    srw. %3,%1,%2
    srwi. %3,%1,%h2
    #
-   #
    #"
-  [(set_attr "type" "logical,shift,shift,shift,shift,shift")
-   (set_attr "var_shift" "no,yes,no,no,yes,no")
+  [(set_attr "type" "shift")
+   (set_attr "var_shift" "yes,no,yes,no")
    (set_attr "dot" "yes")
-   (set_attr "length" "4,4,4,8,8,8")])
+   (set_attr "length" "4,4,8,8")])
 
 (define_split
   [(set (match_operand:CC 0 "cc_reg_not_cr0_operand" "")
@@ -4600,24 +4597,22 @@
   "")
 
 (define_insn ""
-  [(set (match_operand:CC 3 "cc_reg_operand" "=x,x,x,?y,?y,?y")
-	(compare:CC (lshiftrt:SI (match_operand:SI 1 "gpc_reg_operand" "r,r,r,r,r,r")
-				 (match_operand:SI 2 "reg_or_cint_operand" "O,r,i,O,r,i"))
+  [(set (match_operand:CC 3 "cc_reg_operand" "=x,x,?y,?y")
+	(compare:CC (lshiftrt:SI (match_operand:SI 1 "gpc_reg_operand" "r,r,r,r")
+				 (match_operand:SI 2 "reg_or_cint_operand" "r,i,r,i"))
 		    (const_int 0)))
-   (set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r,r,r,r")
+   (set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r,r")
 	(lshiftrt:SI (match_dup 1) (match_dup 2)))]
   "TARGET_32BIT"
   "@
-   mr. %0,%1
    srw. %0,%1,%2
    srwi. %0,%1,%h2
    #
-   #
    #"
-  [(set_attr "type" "logical,shift,shift,shift,shift,shift")
-   (set_attr "var_shift" "no,yes,no,no,yes,no")
+  [(set_attr "type" "shift")
+   (set_attr "var_shift" "yes,no,yes,no")
    (set_attr "dot" "yes")
-   (set_attr "length" "4,4,4,8,8,8")])
+   (set_attr "length" "4,4,8,8")])
 
 (define_split
   [(set (match_operand:CC 3 "cc_reg_not_cr0_operand" "")