i386.md (simple lea to add peephole): Also transform RTXes where second PLUS…

i386.md (simple lea to add peephole): Also transform RTXes where second PLUS operand matches output.

	* config/i386/i386.md (simple lea to add peephole): Also transform
	RTXes where second PLUS operand matches output.

From-SVN: r189320

gcc/ChangeLog

 2012-07-06  Uros Bizjak  <ubizjak@gmail.com>
 
+	* config/i386/i386.md (simple lea to add peephole): Also transform
+	RTXes where second PLUS operand matches output.
+
+2012-07-06  Uros Bizjak  <ubizjak@gmail.com>
+
 	* config/i386/i386.c (construct_plt_address): Make static.
 	* config/i386/i386-protos.h (construct_plt_address): Remove.
 

gcc/config/i386/i386.md

@@ -17301,6 +17301,14 @@
 	      (clobber (reg:CC FLAGS_REG))])])
 
 (define_peephole2
+  [(set (match_operand:SWI48 0 "register_operand")
+  	(plus:SWI48 (match_operand:SWI48 1 "<nonmemory_operand>")
+		    (match_dup 0)))]
+  "peep2_regno_dead_p (0, FLAGS_REG)"
+  [(parallel [(set (match_dup 0) (plus:SWI48 (match_dup 0) (match_dup 1)))
+	      (clobber (reg:CC FLAGS_REG))])])
+
+(define_peephole2
   [(set (match_operand:SI 0 "register_operand")
   	(subreg:SI (plus:DI (match_operand:DI 1 "register_operand")
 			    (match_operand:DI 2 "nonmemory_operand")) 0))]
@@ -17312,6 +17320,17 @@
   "operands[2] = gen_lowpart (SImode, operands[2]);")
 
 (define_peephole2
+  [(set (match_operand:SI 0 "register_operand")
+  	(subreg:SI (plus:DI (match_operand:DI 1 "nonmemory_operand")
+			    (match_operand:DI 2 "register_operand")) 0))]
+  "TARGET_64BIT
+   && peep2_regno_dead_p (0, FLAGS_REG)
+   && REGNO (operands[0]) == REGNO (operands[2])"
+  [(parallel [(set (match_dup 0) (plus:SI (match_dup 0) (match_dup 1)))
+	      (clobber (reg:CC FLAGS_REG))])]
+  "operands[1] = gen_lowpart (SImode, operands[1]);")
+
+(define_peephole2
   [(set (match_operand:SWI48 0 "register_operand")
   	(mult:SWI48 (match_dup 0)
 		    (match_operand:SWI48 1 "const_int_operand")))]