i386.md (extendsidi2): Use # in the output template.

        * i386.md (extendsidi2): Use # in the output template.
        (extendsidi splitters): New splitters.

From-SVN: r23543

gcc/ChangeLog

+Fri Nov  6 00:10:00 1998  Jan Hubicka (hubicka@freesoft.cz)
+
+	* i386.md (extendsidi2): Use # in the output template.
+	(extendsidi splitters): New splitters.
+
 Thu Nov  5 07:59:05 1998  David S. Miller  <davem@pierdol.cobaltmicro.com>
 
 	* jump.c (init_label_info, delete_barrier_successors,

gcc/config/i386/i386.md

@@ -2045,26 +2045,82 @@
 ;;- sign extension instructions
 
 (define_insn "extendsidi2"
-  [(set (match_operand:DI 0 "register_operand" "=r")
-	(sign_extend:DI (match_operand:SI 1 "register_operand" "0")))]
+  [(set (match_operand:DI 0 "nonimmediate_operand" "=A,?r,?Ar,*o")
+	(sign_extend:DI (match_operand:SI 1 "register_operand" "0,0,r,*r")))
+   (clobber (match_scratch:SI 2 "=X,X,X,&r"))]
   ""
-  "*
+  "#")
+
+;; Extend to memory case when source register does die.
+(define_split 
+  [(set (match_operand:DI 0 "memory_operand" "")
+	(sign_extend:DI (match_operand:SI 1 "register_operand" "")))
+   (clobber (match_operand:SI 2 "register_operand" ""))]
+  "(flow2_completed
+    && dead_or_set_p (insn, operands[1])
+    && !reg_mentioned_p (operands[1], operands[0]))"
+  [(set (match_dup 3) (match_dup 1))
+   (set (match_dup 1) (ashiftrt:SI (match_dup 1) (const_int 31)))
+   (set (match_dup 4) (match_dup 1))]
+  "split_di (&operands[0], 1, &operands[3], &operands[4]);")
+
+;; Extend to memory case when source register does not die.
+(define_split 
+  [(set (match_operand:DI 0 "memory_operand" "")
+	(sign_extend:DI (match_operand:SI 1 "register_operand" "")))
+   (clobber (match_operand:SI 2 "register_operand" ""))]
+  "flow2_completed"
+  [(const_int 0)]
+  "
 {
-  if (REGNO (operands[0]) == 0)
+  split_di (&operands[0], 1, &operands[3], &operands[4]);
+
+  emit_move_insn (operands[3], operands[1]);
+
+  /* Generate a cltd if possible and doing so it profitable.  */
+  if (true_regnum (operands[1]) == 0
+      && true_regnum (operands[2]) == 1
+      && (optimize_size || !TARGET_PENTIUM))
     {
-      /* This used to be cwtl, but that extends HI to SI somehow.  */
-#ifdef INTEL_SYNTAX
-      return \"cdq\";
-#else
-      return \"cltd\";
-#endif
+      emit_insn (gen_ashrsi3_31 (operands[2], operands[1]));
+    }
+  else
+    {
+      emit_move_insn (operands[2], operands[1]);
+      emit_insn (gen_ashrsi3_31 (operands[2], operands[2]));
+    }
+  emit_move_insn (operands[4], operands[2]);
+  DONE;
+}")
+
+;; Extend to register case.  Optimize case where source and destination
+;; registers match and cases where we can use cltd.
+(define_split 
+  [(set (match_operand:DI 0 "register_operand" "")
+	(sign_extend:DI (match_operand:SI 1 "register_operand" "")))
+   (clobber (match_scratch:SI 2 ""))]
+  "reload_completed"
+  [(const_int 0)]
+  "
+{
+  split_di (&operands[0], 1, &operands[3], &operands[4]);
+
+  if (true_regnum (operands[3]) != true_regnum (operands[1]))
+    emit_move_insn (operands[3], operands[1]);
+
+  /* Generate a cltd if possible and doing so it profitable.  */
+  if (true_regnum (operands[3]) == 0
+      && (optimize_size || !TARGET_PENTIUM))
+    {
+      emit_insn (gen_ashrsi3_31 (operands[4], operands[3]));
+      DONE;
     }
 
-  operands[1] = gen_rtx_REG (SImode, REGNO (operands[0]) + 1);
-  output_asm_insn (AS2 (mov%L0,%0,%1), operands);
+  if (true_regnum (operands[4]) != true_regnum (operands[1]))
+    emit_move_insn (operands[4], operands[1]);
 
-  operands[0] = GEN_INT (31);
-  return AS2 (sar%L1,%0,%1);
+  emit_insn (gen_ashrsi3_31 (operands[4], operands[4]));
+  DONE;
 }")
 
 ;; Note that the i386 programmers' manual says that the opcodes