(zero_extendqisi2+4,+5): Add new patterns for combining a SI->QI mode truncate...

(zero_extendqisi2+4,+5): Add new patterns for combining
a SI->QI mode truncate with an insn that sets the condition codes.

From-SVN: r3743

gcc/config/sparc/sparc.md

@@ -1419,6 +1419,26 @@
   "andcc %1,0xff,%0"
   [(set_attr "type" "unary")])
 
+;; Similarly, handle SI->QI mode truncation followed by a compare.
+
+(define_insn ""
+  [(set (reg:CC 0)
+	(compare:CC (subreg:QI (match_operand:SI 0 "register_operand" "r") 0)
+		    (const_int 0)))]
+  ""
+  "andcc %0,0xff,%%g0"
+  [(set_attr "type" "compare")])
+
+(define_insn ""
+  [(set (reg:CC 0)
+	(compare:CC (subreg:QI (match_operand:SI 1 "register_operand" "r") 0)
+		    (const_int 0)))
+   (set (match_operand:QI 0 "register_operand" "=r")
+	(match_dup 1))]
+  ""
+  "andcc %1,0xff,%0"
+  [(set_attr "type" "unary")])
+
 ;;- sign extension instructions
 
 ;; These patterns originally accepted general_operands, however, slightly