i386.md (QImode add pattern): Support lea instruction.

        * i386.md (QImode add pattern): Support lea instruction.
        (HImode add pattern): Likewise.

Co-Authored-By: Jeffrey A Law <law@cygnus.com>

From-SVN: r26468

gcc/ChangeLog

 Thu Apr 15 01:03:21 1999  Jan Hubicka <hubicka@freesoft.cz>
 			  Jeff Law <law@cygnus.com>
 
+	* i386.md (QImode add pattern): Support lea instruction.
+	(HImode add pattern): Likewise.
+
 	* i386.md (ashlsi patterns): Call output_ashl instead of output_ashlsi3.
 	(ashlqi): Use expander, separate LEA and SAL / ADD patterns; call
 	output_ashl.

gcc/config/i386/i386.md

@@ -3421,12 +3421,30 @@
   "IX86_EXPAND_BINARY_OPERATOR (PLUS, HImode, operands);")
 
 (define_insn ""
-  [(set (match_operand:HI 0 "nonimmediate_operand" "=rm,r")
-	(plus:HI (match_operand:HI 1 "nonimmediate_operand" "%0,0")
-		 (match_operand:HI 2 "general_operand" "ri,rm")))]
+  [(set (match_operand:HI 0 "nonimmediate_operand" "=rm,r,?r")
+	(plus:HI (match_operand:HI 1 "nonimmediate_operand" "%0,0,r")
+		 (match_operand:HI 2 "general_operand" "ri,rm,ri")))]
   "ix86_binary_operator_ok (PLUS, HImode, operands)"
   "*
 {
+  if (REG_P (operands[0]) && REG_P (operands[1])
+      && (REG_P (operands[2]) || CONSTANT_P (operands[2]))
+      && REGNO (operands[0]) != REGNO (operands[1]))
+    {
+      if (operands[2] == stack_pointer_rtx) 
+	abort ();
+
+      CC_STATUS_INIT;
+      operands[1]
+	= gen_rtx_PLUS (SImode,
+			gen_rtx_REG (SImode, REGNO (operands[1])),
+			(! REG_P (operands[2])
+			 ? operands[2]
+			 : gen_rtx_REG (SImode, REGNO (operands[2]))));
+      operands[0] = gen_rtx_REG (SImode, REGNO (operands[0]));
+      return AS2 (lea%L0,%a1,%0);
+    }
+
   /* ??? what about offsettable memory references? */
   if (!TARGET_PENTIUMPRO /* partial stalls are just too painful to risk. */
       && QI_REG_P (operands[0])
@@ -3488,12 +3506,31 @@
   "IX86_EXPAND_BINARY_OPERATOR (PLUS, QImode, operands);")
 
 (define_insn ""
-  [(set (match_operand:QI 0 "nonimmediate_operand" "=qm,q")
-	(plus:QI (match_operand:QI 1 "nonimmediate_operand" "%0,0")
-		 (match_operand:QI 2 "general_operand" "qn,qmn")))]
+  [(set (match_operand:QI 0 "nonimmediate_operand" "=qm,q,?q")
+	(plus:QI (match_operand:QI 1 "nonimmediate_operand" "%0,0,q")
+		 (match_operand:QI 2 "general_operand" "qn,qmn,qn")))]
   "ix86_binary_operator_ok (PLUS, QImode, operands)"
   "*
 {
+  if (REG_P (operands[0]) && REG_P (operands[1])
+      && (REG_P (operands[2]) || CONSTANT_P (operands[2]))
+      && (REGNO (operands[0]) != REGNO (operands[1])
+	  || NON_QI_REG_P (operands[1])
+	  || (REG_P (operands[2]) && NON_QI_REG_P (operands[2]))))
+    {
+      if (operands[2] == stack_pointer_rtx) 
+	abort ();
+
+      CC_STATUS_INIT;
+      operands[1]
+	= gen_rtx_PLUS (SImode,
+			gen_rtx_REG (SImode, REGNO (operands[1])),
+			(! REG_P (operands[2])
+			 ? operands[2]
+			 : gen_rtx_REG (SImode, REGNO (operands[2]))));
+      operands[0] = gen_rtx_REG (SImode, REGNO (operands[0]));
+      return AS2 (lea%L0,%a1,%0);
+    }
   if (operands[2] == const1_rtx)
     return AS1 (inc%B0,%0);