target.def (legitimate_combined_insn): New target hook.

	* target.def (legitimate_combined_insn): New target hook.
	* doc/tm.texi.in (TARGET_LEGITIMATE_COMBINED_INSN): New hook.
	* doc/tm.texi: Regenerated.
	* combine.c (recog_for_combine): Call targetm.legitimate_combined_insn
	to allow targets to reject combined insn.
	* hooks.h (hook_bool_rtx_true): New.
	* hooks.c (hook_bool_rtx_true): Ditto.

From-SVN: r190846

gcc/ChangeLog

+2012-09-01  Uros Bizjak  <ubizjak@gmail.com>
+
+	* target.def (legitimate_combined_insn): New target hook.
+	* doc/tm.texi.in (TARGET_LEGITIMATE_COMBINED_INSN): New hook.
+	* doc/tm.texi: Regenerated.
+	* combine.c (recog_for_combine): Call targetm.legitimate_combined_insn
+	to allow targets to reject combined insn.
+	* hooks.h (hook_bool_rtx_true): New.
+	* hooks.c (hook_bool_rtx_true): Ditto.
+
 2012-08-31  Martin Jambor  <mjambor@suse.cz>
 
 	* ipa-inline-analysis.c (estimate_function_body_sizes): Allocate
@@ -62,8 +72,9 @@
 2012-08-29  Oleg Endo  <olegendo@gcc.gnu.org>
 
 	* config/sh/iterators.md: New file.
-	* config/sh/sync.md (I124, I12, i124suffix): Delete.  Replace usage with
-	new iterators QIHISI, QIHI, bw, bwl respectively throughout the file.
+	* config/sh/sync.md (I124, I12, i124suffix): Delete.  Replace usage
+	with new iterators QIHISI, QIHI, bw, bwl respectively throughout
+	the file.
 	* config/sh/sh.md: Include new file iterators.md.
 	(zero_extendhisi2, zero_extendqisi2): Fold into zero_extend<mode>si2.
 	(*zero_extendhisi2_compact, *zero_extendqisi2_compact): Fold into

gcc/combine.c

@@ -10500,11 +10500,13 @@ static int
 recog_for_combine (rtx *pnewpat, rtx insn, rtx *pnotes)
 {
   rtx pat = *pnewpat;
+  rtx pat_without_clobbers;
   int insn_code_number;
   int num_clobbers_to_add = 0;
   int i;
-  rtx notes = 0;
+  rtx notes = NULL_RTX;
   rtx old_notes, old_pat;
+  int old_icode;
 
   /* If PAT is a PARALLEL, check to see if it contains the CLOBBER
      we use to indicate that something didn't match.  If we find such a
@@ -10518,7 +10520,7 @@ recog_for_combine (rtx *pnewpat, rtx insn, rtx *pnotes)
   old_pat = PATTERN (insn);
   old_notes = REG_NOTES (insn);
   PATTERN (insn) = pat;
-  REG_NOTES (insn) = 0;
+  REG_NOTES (insn) = NULL_RTX;
 
   insn_code_number = recog (pat, insn, &num_clobbers_to_add);
   if (dump_file && (dump_flags & TDF_DETAILS))
@@ -10564,6 +10566,9 @@ recog_for_combine (rtx *pnewpat, rtx insn, rtx *pnotes)
 	  print_rtl_single (dump_file, pat);
 	}
     }
+
+  pat_without_clobbers = pat;
+
   PATTERN (insn) = old_pat;
   REG_NOTES (insn) = old_notes;
 
@@ -10605,6 +10610,35 @@ recog_for_combine (rtx *pnewpat, rtx insn, rtx *pnotes)
       pat = newpat;
     }
 
+  if (insn_code_number >= 0
+      && insn_code_number != NOOP_MOVE_INSN_CODE)
+    {
+      old_pat = PATTERN (insn);
+      old_notes = REG_NOTES (insn);
+      old_icode = INSN_CODE (insn);
+      PATTERN (insn) = pat;
+      REG_NOTES (insn) = notes;
+
+      /* Allow targets to reject combined insn.  */
+      if (!targetm.legitimate_combined_insn (insn))
+	{
+	  if (dump_file && (dump_flags & TDF_DETAILS))
+	    fputs ("Instruction not appropriate for target.",
+		   dump_file);
+
+	  /* Callers expect recog_for_combine to strip
+	     clobbers from the pattern on failure.  */
+	  pat = pat_without_clobbers;
+	  notes = NULL_RTX;
+
+	  insn_code_number = -1;
+	}
+
+      PATTERN (insn) = old_pat;
+      REG_NOTES (insn) = old_notes;
+      INSN_CODE (insn) = old_icode;
+    }
+
   *pnewpat = pat;
   *pnotes = notes;
 

gcc/doc/tm.texi

@@ -10938,6 +10938,10 @@ By default, the RTL loop optimizer does not use a present doloop pattern for
 loops containing function calls or branch on table instructions.
 @end deftypefn
 
+@deftypefn {Target Hook} bool TARGET_LEGITIMATE_COMBINED_INSN (rtx @var{insn})
+Take an instruction in @var{insn} and return @code{false} if the instruction is not appropriate as a combination of two or more instructions.  The default is to accept all instructions.
+@end deftypefn
+
 @defmac MD_CAN_REDIRECT_BRANCH (@var{branch1}, @var{branch2})
 
 Take a branch insn in @var{branch1} and another in @var{branch2}.

gcc/doc/tm.texi.in

@@ -10796,6 +10796,8 @@ By default, the RTL loop optimizer does not use a present doloop pattern for
 loops containing function calls or branch on table instructions.
 @end deftypefn
 
+@hook TARGET_LEGITIMATE_COMBINED_INSN
+
 @defmac MD_CAN_REDIRECT_BRANCH (@var{branch1}, @var{branch2})
 
 Take a branch insn in @var{branch1} and another in @var{branch2}.

gcc/hooks.c

@@ -269,6 +269,12 @@ hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 }
 
 bool
+hook_bool_rtx_true (rtx a ATTRIBUTE_UNUSED)
+{
+  return true;
+}
+
+bool
 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 {
   return false;

gcc/hooks.h

@@ -50,6 +50,7 @@ extern bool hook_bool_const_tree_hwi_hwi_const_tree_true (const_tree,
 							  HOST_WIDE_INT,
 							  HOST_WIDE_INT,
 							  const_tree);
+extern bool hook_bool_rtx_true (rtx);
 extern bool hook_bool_rtx_false (rtx);
 extern bool hook_bool_rtx_int_false (rtx, int);
 extern bool hook_bool_uintp_uintp_false (unsigned int *, unsigned int *);

gcc/target.def

@@ -1984,6 +1984,15 @@ DEFHOOK
  const char *, (const_rtx insn),
  default_invalid_within_doloop)
 
+/* Returns true for a legitimate combined insn.  */
+DEFHOOK
+(legitimate_combined_insn,
+"Take an instruction in @var{insn} and return @code{false} if the instruction\
+ is not appropriate as a combination of two or more instructions.  The\
+ default is to accept all instructions.",
+ bool, (rtx insn),
+ hook_bool_rtx_true)
+
 DEFHOOK
 (valid_dllimport_attribute_p,
 "@var{decl} is a variable or function with @code{__attribute__((dllimport))}\