re PR target/49487 ([avr] ICE in bytewise rotate)

	
	PR target/49487
	* config/avr/avr.md (rotl<mode>3): Generate SCRATCH instead
	of REG.
	(*rotw<mode>): Use const_int_operand for operand2.
	Use match_scatch for operand3.
	(*rotb<mode>): Ditto
	* config/avr/avr.c (avr_rotate_bytes): Treat SCRATCH.

From-SVN: r176276

gcc/ChangeLog

+2011-07-14  Georg-Johann Lay  <avr@gjlay.de>
+	
+	PR target/49487
+	* config/avr/avr.md (rotl<mode>3): Generate SCRATCH instead
+	of REG.
+	(*rotw<mode>): Use const_int_operand for operand2.
+	Use match_scatch for operand3.
+	(*rotb<mode>): Ditto
+	* config/avr/avr.c (avr_rotate_bytes): Treat SCRATCH.
+
 2011-07-14  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/49651

gcc/config/avr/avr.c

@@ -4438,7 +4438,9 @@ avr_rotate_bytes (rtx operands[])
     if (mode == DImode)
       move_mode = QImode;
     /* Make scratch smaller if needed.  */
-    if (GET_MODE (scratch) == HImode && move_mode == QImode)
+    if (SCRATCH != GET_CODE (scratch)
+        && HImode == GET_MODE (scratch)
+        && QImode == move_mode)
       scratch = simplify_gen_subreg (move_mode, scratch, HImode, 0); 
 
     move_size = GET_MODE_SIZE (move_mode);
@@ -4534,6 +4536,8 @@ avr_rotate_bytes (rtx operands[])
 		   When this move occurs, it will break chain deadlock.
 		   The scratch register is substituted for real move.  */
 
+		gcc_assert (SCRATCH != GET_CODE (scratch));
+
 		move[size].src = move[blocked].dst;
 		move[size].dst =  scratch;
 		/* Scratch move is never blocked.  */

gcc/config/avr/avr.md

@@ -1597,18 +1597,18 @@
 				(match_operand:VOID 2 "const_int_operand" "")))
 		(clobber (match_dup 3))])]
   ""
-  "
-{
-  if (CONST_INT_P (operands[2]) && 0 == (INTVAL (operands[2]) % 8))
   {
-  if (AVR_HAVE_MOVW && 0 == INTVAL (operands[2]) % 16)
-    operands[3] = gen_reg_rtx (<rotsmode>mode);
-  else
-    operands[3] = gen_reg_rtx (QImode);
-  }
-  else
-    FAIL;
-}")
+    if (CONST_INT_P (operands[2])
+        && 0 == INTVAL (operands[2]) % 8)
+      {
+        if (AVR_HAVE_MOVW && 0 == INTVAL (operands[2]) % 16)
+          operands[3] = gen_rtx_SCRATCH (<rotsmode>mode);
+        else
+          operands[3] = gen_rtx_SCRATCH (QImode);
+      }
+    else
+      FAIL;
+  })
 
 
 ;; Overlapping non-HImode registers often (but not always) need a scratch.
@@ -1620,34 +1620,38 @@
 ; Split word aligned rotates using scratch that is mode dependent.
 (define_insn_and_split "*rotw<mode>"
   [(set (match_operand:HIDI 0 "register_operand" "=r,r,#&r")
-	(rotate:HIDI (match_operand:HIDI 1 "register_operand" "0,r,r")
-		     (match_operand 2 "immediate_operand" "n,n,n")))
-   (clobber (match_operand:<rotsmode> 3 "register_operand"  "=<rotx>" ))]
-  "(CONST_INT_P (operands[2]) &&
-     (0 == (INTVAL (operands[2]) % 16) && AVR_HAVE_MOVW))"
+        (rotate:HIDI (match_operand:HIDI 1 "register_operand" "0,r,r")
+                     (match_operand 2 "const_int_operand" "n,n,n")))
+   (clobber (match_scratch:<rotsmode> 3 "=<rotx>"))]
+  "AVR_HAVE_MOVW
+   && CONST_INT_P (operands[2])
+   && 0 == INTVAL (operands[2]) % 16"
   "#"
   "&& (reload_completed || <MODE>mode == DImode)"
   [(const_int 0)]
-  "avr_rotate_bytes (operands);
-  DONE;"
-)
+  {
+    avr_rotate_bytes (operands);
+    DONE;
+  })
 
 
 ; Split byte aligned rotates using scratch that is always QI mode.
 (define_insn_and_split "*rotb<mode>"
   [(set (match_operand:HIDI 0 "register_operand" "=r,r,#&r")
-	(rotate:HIDI (match_operand:HIDI 1 "register_operand" "0,r,r")
-		     (match_operand 2 "immediate_operand" "n,n,n")))
-   (clobber (match_operand:QI 3 "register_operand" "=<rotx>" ))]
-  "(CONST_INT_P (operands[2]) &&
-     (8 == (INTVAL (operands[2]) % 16)
-     	|| (!AVR_HAVE_MOVW && 0 == (INTVAL (operands[2]) % 16))))"
+        (rotate:HIDI (match_operand:HIDI 1 "register_operand" "0,r,r")
+                     (match_operand 2 "const_int_operand" "n,n,n")))
+   (clobber (match_scratch:QI 3 "=<rotx>"))]
+  "CONST_INT_P (operands[2])
+   && (8 == INTVAL (operands[2]) % 16
+       || (!AVR_HAVE_MOVW
+           && 0 == INTVAL (operands[2]) % 16))"
   "#"
   "&& (reload_completed || <MODE>mode == DImode)"
   [(const_int 0)]
-  "avr_rotate_bytes (operands);
-  DONE;"
-)
+  {
+    avr_rotate_bytes (operands);
+    DONE;
+  })
 
 
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