re PR target/18251 (unable to find a register to spill in class `POINTER_REGS')

	PR target/18251
	* config/avr/avr.md (movmemhi): Rewrite as RTL loop.
	(*movmemqi_insn): Delete.
	(*movmemhi): Delete.

From-SVN: r96365

gcc/ChangeLog

+2005-03-13  Andy Hutchinson  <HutchinsonAndy@netscape.net>
+
+	PR target/18251
+	* config/avr/avr.md (movmemhi): Rewrite as RTL loop.
+	(*movmemqi_insn): Delete.
+	(*movmemhi): Delete.
+
 2005-03-13  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* builtins.c (fold_builtin_classify): Take decomposed

gcc/config/avr/avr.md

@@ -346,75 +346,69 @@
 
 ;;=========================================================================
 ;; move string (like memcpy)
+;; implement as RTL loop
 
 (define_expand "movmemhi"
   [(parallel [(set (match_operand:BLK 0 "memory_operand" "")
-		   (match_operand:BLK 1 "memory_operand" ""))
-	      (use (match_operand:HI 2 "const_int_operand" ""))
-	      (use (match_operand:HI 3 "const_int_operand" ""))
-	      (clobber (match_scratch:HI 4 ""))
-	      (clobber (match_scratch:HI 5 ""))
-	      (clobber (match_dup 6))])]
+          (match_operand:BLK 1 "memory_operand" ""))
+          (use (match_operand:HI 2 "const_int_operand" ""))
+          (use (match_operand:HI 3 "const_int_operand" ""))])]
   ""
   "{
-  rtx addr0, addr1;
-  int cnt8;
+  int prob;
+  HOST_WIDE_INT count;
   enum machine_mode mode;
+  rtx label = gen_label_rtx ();
+  rtx loop_reg;
+  rtx jump;
+
+  /* Copy pointers into new psuedos - they will be changed.  */
+  rtx addr0 = copy_to_mode_reg (Pmode, XEXP (operands[0], 0));
+  rtx addr1 = copy_to_mode_reg (Pmode, XEXP (operands[1], 0));
+
+  /* Create rtx for tmp register - we use this as scratch.  */
+  rtx tmp_reg_rtx  = gen_rtx_REG (QImode, TMP_REGNO);
 
   if (GET_CODE (operands[2]) != CONST_INT)
     FAIL;
-  cnt8 = byte_immediate_operand (operands[2], GET_MODE (operands[2]));
-  mode = cnt8 ? QImode : HImode;
-  operands[6] = gen_rtx_SCRATCH (mode);
-  operands[2] = copy_to_mode_reg (mode,
-                                  gen_int_mode (INTVAL (operands[2]), mode));
-  addr0 = copy_to_mode_reg (Pmode, XEXP (operands[0], 0));
-  addr1 = copy_to_mode_reg (Pmode, XEXP (operands[1], 0));
 
-  operands[0] = gen_rtx_MEM (BLKmode, addr0);
-  operands[1] = gen_rtx_MEM (BLKmode, addr1);
-}")
-
-(define_insn "*movmemqi_insn"
-  [(set (mem:BLK (match_operand:HI 0 "register_operand" "e"))
-	(mem:BLK (match_operand:HI 1 "register_operand" "e")))
-   (use (match_operand:QI 2 "register_operand" "r"))
-   (use (match_operand:QI 3 "const_int_operand" "i"))
-   (clobber (match_scratch:HI 4 "=0"))
-   (clobber (match_scratch:HI 5 "=1"))
-   (clobber (match_scratch:QI 6 "=2"))]
-  ""
-  "ld __tmp_reg__,%a1+
-	st %a0+,__tmp_reg__
-	dec %2
-	brne .-8"
-  [(set_attr "length" "4")
-   (set_attr "cc" "clobber")])
+  count = INTVAL (operands[2]);
+  if (count <= 0)
+    FAIL;
 
-(define_insn "*movmemhi"
-  [(set (mem:BLK (match_operand:HI 0 "register_operand" "e,e"))
-	(mem:BLK (match_operand:HI 1 "register_operand" "e,e")))
-   (use (match_operand:HI 2 "register_operand" "!w,d"))
-   (use (match_operand:HI 3 "const_int_operand" ""))
-   (clobber (match_scratch:HI 4 "=0,0"))
-   (clobber (match_scratch:HI 5 "=1,1"))
-   (clobber (match_scratch:HI 6 "=2,2"))]
-  ""
-  "*{
-     if (which_alternative==0)
-       return (AS2 (ld,__tmp_reg__,%a1+) CR_TAB
-	       AS2 (st,%a0+,__tmp_reg__)  CR_TAB
-	       AS2 (sbiw,%A2,1) CR_TAB
-	       AS1 (brne,.-8));
-     else
-       return (AS2 (ld,__tmp_reg__,%a1+) CR_TAB
-	       AS2 (st,%a0+,__tmp_reg__)  CR_TAB
-	       AS2 (subi,%A2,1) CR_TAB
-	       AS2 (sbci,%B2,0) CR_TAB
-	       AS1 (brne,.-10));
-}"
-  [(set_attr "length" "4,5")
-   (set_attr "cc" "clobber,clobber")])
+  /* Work out branch probability for latter use.  */
+  prob = REG_BR_PROB_BASE - REG_BR_PROB_BASE / count;
+
+  /* See if constant fit 8 bits.  */
+  mode = (count < 0x100) ? QImode : HImode;
+  /* Create loop counter register.  */
+  loop_reg = copy_to_mode_reg (mode, gen_int_mode (count, mode));
+
+  /* Now create RTL code for move loop.  */
+  /* Label at top of loop.  */
+  emit_label (label);
+
+  /* Move one byte into scratch and inc pointer.  */
+  emit_move_insn (tmp_reg_rtx, gen_rtx_MEM (QImode, addr1));
+  emit_move_insn (addr1, gen_rtx_PLUS (Pmode, addr1, const1_rtx));
+
+  /* Move to mem and inc pointer.  */
+  emit_move_insn (gen_rtx_MEM (QImode, addr0), tmp_reg_rtx);
+  emit_move_insn (addr0, gen_rtx_PLUS (Pmode, addr0, const1_rtx));
+
+  /* Decrement count.  */
+  emit_move_insn (loop_reg, gen_rtx_PLUS (mode, loop_reg, constm1_rtx));
+
+  /* Compare with zero and jump if not equal. */
+  emit_cmp_and_jump_insns (loop_reg, const0_rtx, NE, NULL_RTX, mode, 1,
+                           label);
+  /* Set jump probability based on loop count.  */
+  jump = get_last_insn ();
+  REG_NOTES (jump) = gen_rtx_EXPR_LIST (REG_BR_PROB,
+                    GEN_INT (prob),
+                    REG_NOTES (jump));
+  DONE;
+}")
 
 ;; =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0
 ;; memset (%0, 0, %1)