re PR target/54089 ([SH] Refactor shift patterns)

	PR target/54089
	* config/sh/predicates.md (shift_count_operand): Handle not-SHMEDIA
	case.
	(p27_shift_count_operand, not_p27_shift_count_operand): New predicates.
	* config/sh/sh.md (ashlsi3): Remove parallel and T_REG clobber
	from expander.  Do not emit shift insn for not-SHMEDIA case.
	(ashlsi3_std): Replace with ...
	(ashlsi3_k, ashlsi3_d): ... these new insns.
	* config/sh/sh.c (gen_ashift): Make static.  Add sanity checks.
	Emit ashlsi3_k insn instead of ashlsi3_std in ASHIFT case.
	(gen_ashift_hi): Make static.
	* config/sh/sh-protos.h (gen_ashift, gen_ashift_hi): Remove forward
	declaration.

From-SVN: r189872

gcc/ChangeLog

+2012-07-25  Oleg Endo  <olegendo@gcc.gnu.org>
+
+	PR target/54089
+	* config/sh/predicates.md (shift_count_operand): Handle not-SHMEDIA
+	case.
+	(p27_shift_count_operand, not_p27_shift_count_operand): New predicates.
+	* config/sh/sh.md (ashlsi3): Remove parallel and T_REG clobber
+	from expander.  Do not emit shift insn for not-SHMEDIA case.
+	(ashlsi3_std): Replace with ...
+	(ashlsi3_k, ashlsi3_d): ... these new insns.
+	* config/sh/sh.c (gen_ashift): Make static.  Add sanity checks.
+	Emit ashlsi3_k insn instead of ashlsi3_std in ASHIFT case.
+	(gen_ashift_hi): Make static.
+	* config/sh/sh-protos.h (gen_ashift, gen_ashift_hi): Remove forward
+	declaration.
+
 2012-07-25  Bharathi Seshadri  <bseshadr@cisco.com>
 	    Jim Wilson  <jimwilso@cisco.com>
 

gcc/config/sh/predicates.md

@@ -755,6 +755,13 @@
 (define_predicate "shift_count_operand"
   (match_code "const_int,const_double,const,symbol_ref,label_ref,subreg,reg,zero_extend,sign_extend")
 {
+  /* Allow T_REG as shift count for dynamic shifts, although it is not
+     really possible.  It will then be copied to a general purpose reg.  */
+  if (! TARGET_SHMEDIA)
+    return const_int_operand (op, mode)
+	   || (TARGET_DYNSHIFT && (arith_reg_operand (op, mode)
+				   || t_reg_operand (op, mode)));
+
   return (CONSTANT_P (op)
 	  ? (CONST_INT_P (op)
 	     ? (unsigned) INTVAL (op) < GET_MODE_BITSIZE (mode)
@@ -785,6 +792,14 @@
   return arith_reg_operand (op, mode);
 })
 
+(define_predicate "p27_shift_count_operand"
+  (and (match_code "const_int")
+       (match_test "satisfies_constraint_P27 (op)")))
+
+(define_predicate "not_p27_shift_count_operand"
+  (and (match_code "const_int")
+       (match_test "! satisfies_constraint_P27 (op)")))
+
 ;; TODO: Add a comment here.
 
 (define_predicate "shift_operator"

gcc/config/sh/sh-protos.h

@@ -74,8 +74,6 @@ extern rtx sh_emit_cheap_store_flag (enum machine_mode, enum rtx_code, rtx, rtx)
 extern void sh_emit_compare_and_branch (rtx *, enum machine_mode);
 extern void sh_emit_compare_and_set (rtx *, enum machine_mode);
 extern int shift_insns_rtx (rtx);
-extern void gen_ashift (int, int, rtx);
-extern void gen_ashift_hi (int, int, rtx);
 extern void gen_shifty_op (int, rtx *);
 extern void gen_shifty_hi_op (int, rtx *);
 extern bool expand_ashiftrt (rtx *);

gcc/config/sh/sh.c

@@ -3277,9 +3277,11 @@ sh_address_cost (rtx x, bool speed ATTRIBUTE_UNUSED)
 
 /* Code to expand a shift.  */
 
-void
+static void
 gen_ashift (int type, int n, rtx reg)
 {
+  rtx n_rtx;
+
   /* Negative values here come from the shift_amounts array.  */
   if (n < 0)
     {
@@ -3290,26 +3292,30 @@ gen_ashift (int type, int n, rtx reg)
       n = -n;
     }
 
+  n_rtx = GEN_INT (n);
+  gcc_assert (satisfies_constraint_P27 (n_rtx));
+
   switch (type)
     {
     case ASHIFTRT:
-      emit_insn (gen_ashrsi3_k (reg, reg, GEN_INT (n)));
+      emit_insn (gen_ashrsi3_k (reg, reg, n_rtx));
       break;
     case LSHIFTRT:
       if (n == 1)
-	emit_insn (gen_lshrsi3_m (reg, reg, GEN_INT (n)));
+	emit_insn (gen_lshrsi3_m (reg, reg, n_rtx));
       else
-	emit_insn (gen_lshrsi3_k (reg, reg, GEN_INT (n)));
+	emit_insn (gen_lshrsi3_k (reg, reg, n_rtx));
       break;
     case ASHIFT:
-      emit_insn (gen_ashlsi3_std (reg, reg, GEN_INT (n)));
+      emit_insn (gen_ashlsi3_k (reg, reg, n_rtx));
       break;
+    default:
+      gcc_unreachable ();
     }
 }
 
 /* Same for HImode */
-
-void
+static void
 gen_ashift_hi (int type, int n, rtx reg)
 {
   /* Negative values here come from the shift_amounts array.  */

gcc/config/sh/sh.md

@@ -3492,10 +3492,9 @@ label:
 ;; SImode shift left
 
 (define_expand "ashlsi3"
-  [(parallel [(set (match_operand:SI 0 "arith_reg_operand" "")
-		   (ashift:SI (match_operand:SI 1 "arith_reg_operand" "")
-			      (match_operand:SI 2 "nonmemory_operand" "")))
-	      (clobber (reg:SI T_REG))])]
+  [(set (match_operand:SI 0 "arith_reg_operand" "")
+	(ashift:SI (match_operand:SI 1 "arith_reg_operand" "")
+		   (match_operand:SI 2 "shift_count_operand" "")))]
   ""
 {
   if (TARGET_SHMEDIA)
@@ -3503,56 +3502,74 @@ label:
       emit_insn (gen_ashlsi3_media (operands[0], operands[1], operands[2]));
       DONE;
     }
-  if (CONST_INT_P (operands[2])
-      && sh_dynamicalize_shift_p (operands[2]))
-    operands[2] = force_reg (SImode, operands[2]);
-  if (TARGET_DYNSHIFT)
+  if (TARGET_DYNSHIFT
+      && CONST_INT_P (operands[2]) && sh_dynamicalize_shift_p (operands[2]))
+      operands[2] = force_reg (SImode, operands[2]);
+})
+
+(define_insn "ashlsi3_k"
+  [(set (match_operand:SI 0 "arith_reg_dest" "=r,r")
+	(ashift:SI (match_operand:SI 1 "arith_reg_operand" "0,0")
+		   (match_operand:SI 2 "p27_shift_count_operand" "M,P27")))]
+  "TARGET_SH1"
+  "@
+	add	%0,%0
+	shll%O2	%0"
+  [(set_attr "type" "arith")])
+
+(define_insn_and_split "ashlsi3_d"
+  [(set (match_operand:SI 0 "arith_reg_dest" "=r")
+	(ashift:SI (match_operand:SI 1 "arith_reg_operand" "0")
+		   (match_operand:SI 2 "shift_count_operand" "r")))]
+  "TARGET_DYNSHIFT"
+  "shld	%2,%0"
+  "&& (CONST_INT_P (operands[2]) && ! sh_dynamicalize_shift_p (operands[2]))"
+  [(const_int 0)]
+{
+  if (satisfies_constraint_P27 (operands[2]))
     {
-      emit_insn (gen_ashlsi3_std (operands[0], operands[1], operands[2]));
+      emit_insn (gen_ashlsi3_k (operands[0], operands[1], operands[2]));
+      DONE;
+    }
+  else if (!satisfies_constraint_P27 (operands[2]))
+    {
+      emit_insn (gen_ashlsi3_n (operands[0], operands[1], operands[2]));
       DONE;
     }
-  if (! immediate_operand (operands[2], GET_MODE (operands[2])))
-    FAIL;
-})
 
-;; This pattern is used by init_expmed for computing the costs of shift
-;; insns.
-(define_insn_and_split "ashlsi3_std"
-  [(set (match_operand:SI 0 "arith_reg_dest" "=r,r,r,r")
-	(ashift:SI (match_operand:SI 1 "arith_reg_operand" "0,0,0,0")
-		   (match_operand:SI 2 "nonmemory_operand" "r,M,P27,?ri")))
-   (clobber (match_scratch:SI 3 "=X,X,X,&r"))]
-  "TARGET_DYNSHIFT || (TARGET_SH1 && satisfies_constraint_P27 (operands[2]))"
-  "@
-   shld	%2,%0
-   add	%0,%0
-   shll%O2	%0
-   #"
-  "TARGET_DYNSHIFT
-   && reload_completed
-   && CONST_INT_P (operands[2])
-   && ! satisfies_constraint_P27 (operands[2])"
-  [(set (match_dup 3) (match_dup 2))
-   (parallel
-    [(set (match_dup 0) (ashift:SI (match_dup 1) (match_dup 3)))
-     (clobber (match_dup 4))])]
-{
-  operands[4] = gen_rtx_SCRATCH (SImode);
+  FAIL;
 }
-  [(set_attr "length" "*,*,*,4")
-   (set_attr "type" "dyn_shift,arith,arith,arith")])
+  [(set_attr "type" "arith")])
 
 (define_insn_and_split "ashlsi3_n"
   [(set (match_operand:SI 0 "arith_reg_dest" "=r")
 	(ashift:SI (match_operand:SI 1 "arith_reg_operand" "0")
-		   (match_operand:SI 2 "const_int_operand" "n")))
-   (clobber (reg:SI T_REG))]
-  "TARGET_SH1 && ! sh_dynamicalize_shift_p (operands[2])"
+		   (match_operand:SI 2 "not_p27_shift_count_operand" "")))]
+  "TARGET_SH1"
   "#"
-  "TARGET_SH1 && reload_completed"
-  [(use (reg:SI R0_REG))]
+  "&& (reload_completed || INTVAL (operands[2]) == 31
+       || (sh_dynamicalize_shift_p (operands[2]) && can_create_pseudo_p ()))"
+  [(const_int 0)]
 {
-  gen_shifty_op (ASHIFT, operands);
+  if (INTVAL (operands[2]) == 31)
+    {
+      /* If the shift amount is 31 we split into a different sequence before
+	 reload so that it gets a chance to allocate R0 for the sequence.
+	 If it fails to do so (due to pressure on R0), it will take one insn
+	 more for the and.  */
+      emit_insn (gen_andsi3 (operands[0], operands[1], const1_rtx));
+      emit_insn (gen_rotlsi3_31 (operands[0], operands[0]));
+    }
+  else if (sh_dynamicalize_shift_p (operands[2]) && can_create_pseudo_p ())
+    {
+      /* If this pattern was picked and dynamic shifts are supported, switch
+	 to dynamic shift pattern before reload.  */
+      operands[2] = force_reg (SImode, operands[2]);
+      emit_insn (gen_ashlsi3_d (operands[0], operands[1], operands[2]));
+    }
+  else
+    gen_shifty_op (ASHIFT, operands);
+
   DONE;
 })