alpha.md: Revert Thu Nov 26 change that came in through the last gcc2 merge...

        * alpha.md: Revert Thu Nov 26 change that came in through the
        last gcc2 merge: reinstate (plus (plus ...)) reload patterns.
        Avoid earlyclobber when possible.

From-SVN: r29466

gcc/ChangeLog

+Thu Sep 16 16:35:41 1999  Richard Henderson  <rth@cygnus.com>
+
+	* alpha.md: Revert Thu Nov 26 change that came in through the
+	last gcc2 merge: reinstate (plus (plus ...)) reload patterns.
+	Avoid earlyclobber when possible.
+
 Thu Sep 16 18:44:48 1999  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* libgcc2.c (__do_global_ctors): Call atexit with one arg.

gcc/config/alpha/alpha.md

@@ -650,6 +650,97 @@
    s%2addq %1,%3,%0
    s%2subq %1,%n3,%0")
 
+;; These variants of the above insns can occur if the third operand
+;; is the frame pointer, or other eliminable register.  E.g. some
+;; register holding an offset from the stack pointer.  This is a
+;; kludge, but there doesn't seem to be a way around it.  Only
+;; recognize them while reloading.
+
+(define_insn ""
+  [(set (match_operand:DI 0 "some_operand" "=r,&r")
+	(plus:DI (plus:DI (match_operand:DI 1 "some_operand" "%r,r")
+			  (match_operand:DI 2 "some_operand" "%r,r"))
+		 (match_operand:DI 3 "some_operand" "IOKL,r")))]
+  "reload_in_progress"
+  "#")
+
+(define_split
+  [(set (match_operand:DI 0 "register_operand" "")
+	(plus:DI (plus:DI (match_operand:DI 1 "register_operand" "")
+			  (match_operand:DI 2 "register_operand" ""))
+		 (match_operand:DI 3 "add_operand" "")))]
+  "reload_completed"
+  [(set (match_dup 0) (plus:DI (match_dup 1) (match_dup 2)))
+   (set (match_dup 0) (plus:DI (match_dup 0) (match_dup 3)))]
+  "")
+					   
+(define_insn ""
+  [(set (match_operand:SI 0 "some_operand" "=r,&r")
+	(plus:SI (plus:SI (mult:SI (match_operand:SI 1 "some_operand" "rJ,rJ")
+				   (match_operand:SI 2 "const48_operand" "I,I"))
+			  (match_operand:SI 3 "some_operand" "%r,r"))
+		 (match_operand:SI 4 "some_operand" "IOKL,r")))]
+  "reload_in_progress"
+  "#")
+
+(define_split
+  [(set (match_operand:SI 0 "register_operand" "")
+	(plus:SI (plus:SI (mult:SI (match_operand:SI 1 "reg_or_0_operand" "")
+				   (match_operand:SI 2 "const48_operand" ""))
+			  (match_operand:SI 3 "register_operand" ""))
+		 (match_operand:SI 4 "add_operand" "rIOKL")))]
+  "reload_completed"
+  [(set (match_dup 0)
+	(plus:SI (mult:SI (match_dup 1) (match_dup 2)) (match_dup 3)))
+   (set (match_dup 0) (plus:SI (match_dup 0) (match_dup 4)))]
+  "")
+
+(define_insn ""
+  [(set (match_operand:DI 0 "some_operand" "=r,&r")
+	(sign_extend:DI
+	 (plus:SI (plus:SI
+		   (mult:SI (match_operand:SI 1 "some_operand" "rJ,rJ")
+			    (match_operand:SI 2 "const48_operand" "I,I"))
+		   (match_operand:SI 3 "some_operand" "%r,r"))
+		  (match_operand:SI 4 "some_operand" "IO,r"))))]
+  "reload_in_progress"
+  "#")
+
+(define_split
+  [(set (match_operand:DI 0 "register_operand" "")
+	(sign_extend:DI
+	 (plus:SI (plus:SI
+		   (mult:SI (match_operand:SI 1 "reg_or_0_operand" "")
+			    (match_operand:SI 2 "const48_operand" ""))
+		   (match_operand:SI 3 "register_operand" ""))
+		  (match_operand:SI 4 "sext_add_operand" ""))))]
+  "reload_completed"
+  [(set (match_dup 5)
+	(plus:SI (mult:SI (match_dup 1) (match_dup 2)) (match_dup 3)))
+   (set (match_dup 0) (sign_extend:DI (plus:SI (match_dup 5) (match_dup 4))))]
+  "operands[5] = gen_lowpart (SImode, operands[0]);")
+
+(define_insn ""
+  [(set (match_operand:DI 0 "some_operand" "=r,&r")
+	(plus:DI (plus:DI (mult:DI (match_operand:DI 1 "some_operand" "rJ,rJ")
+				   (match_operand:DI 2 "const48_operand" "I,I"))
+			  (match_operand:DI 3 "some_operand" "%r,r"))
+		 (match_operand:DI 4 "some_operand" "IOKL,r")))]
+  "reload_in_progress"
+  "#")
+
+(define_split
+  [(set (match_operand:DI 0 "register_operand" "")
+	(plus:DI (plus:DI (mult:DI (match_operand:DI 1 "reg_or_0_operand" "")
+				   (match_operand:DI 2 "const48_operand" ""))
+			  (match_operand:DI 3 "register_operand" ""))
+		 (match_operand:DI 4 "add_operand" "")))]
+  "reload_completed"
+  [(set (match_dup 0)
+	(plus:DI (mult:DI (match_dup 1) (match_dup 2)) (match_dup 3)))
+   (set (match_dup 0) (plus:DI (match_dup 0) (match_dup 4)))]
+  "")
+
 (define_insn "negsi2"
   [(set (match_operand:SI 0 "register_operand" "=r")
 	(neg:SI (match_operand:SI 1 "reg_or_8bit_operand" "rI")))]