From a5004c3da9d0b789d68611ec00a1f59d8f62761b Mon Sep 17 00:00:00 2001
From: uweigand <uweigand@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 14 Aug 2002 10:04:51 +0000
Subject: 	* reload.c (find_reloads): Handle constraint letters marked by
 	EXTRA_ADDRESS_CONSTRAINT and EXTRA_MEMORY_CONSTRAINT. 
 (alternative_allows_memconst): Likewise. 	* reload1.c
 (maybe_fix_stack_asms): Likewise. 	* recog.c (asm_operand_ok,
 preprocess_constraints, 	constrain_operands): Likewise. 	* regclass.c
 (record_operand_costs, record_reg_classes): Likewise. 	* local-alloc.c
 (block_alloc, requires_inout): Likewise. 	* stmt.c
 (parse_output_constraint, parse_input_constraint): Likewise.

	* defaults.h (EXTRA_MEMORY_CONSTRAINT): Provide a default.
	(EXTRA_ADDRESS_CONSTRAINT): Likewise.
	* doc/tm.texi: Document these two new target macros.

	* config/s390/s390.c (s390_expand_plus_operand): Accept already
	valid operands.
	(q_constraint): New function.
	config/s390/s390-protos.h (q_constraint): Declare it.
	config/s390/s390.h (EXTRA_CONSTRAINT): Use it.
	(EXTRA_MEMORY_CONSTRAINT): New macro.

	* config/s390/s390.md: Throughout the machine description,
	replace all instances of the constraint combinations 'Qo'
	or 'oQ' with simply 'Q'.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@56291 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/recog.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

(limited to 'gcc/recog.c')

diff --git a/gcc/recog.c b/gcc/recog.c
index c56069a053c..6bb8670e166 100644
--- a/gcc/recog.c
+++ b/gcc/recog.c
@@ -1848,6 +1848,18 @@ asm_operand_ok (op, constraint)
 #ifdef EXTRA_CONSTRAINT
 	  if (EXTRA_CONSTRAINT (op, c))
 	    return 1;
+	  if (EXTRA_MEMORY_CONSTRAINT (c))
+	    {
+	      /* Every memory operand can be reloaded to fit.  */
+	      if (memory_operand (op, VOIDmode))
+	        return 1;
+	    }
+	  if (EXTRA_ADDRESS_CONSTRAINT (c))
+	    {
+	      /* Every address operand can be reloaded to fit.  */
+	      if (address_operand (op, VOIDmode))
+	        return 1;
+	    }
 #endif
 	  break;
 	}
@@ -2287,6 +2299,19 @@ preprocess_constraints ()
 		  break;
 
 		default:
+		  if (EXTRA_MEMORY_CONSTRAINT (c))
+		    {
+		      op_alt[j].memory_ok = 1;
+		      break;
+		    }
+		  if (EXTRA_ADDRESS_CONSTRAINT (c))
+		    {
+		      op_alt[j].is_address = 1;
+		      op_alt[j].class = reg_class_subunion[(int) op_alt[j].class]
+		        [(int) MODE_BASE_REG_CLASS (VOIDmode)];
+		      break;
+		    }
+
 		  op_alt[j].class = reg_class_subunion[(int) op_alt[j].class][(int) REG_CLASS_FROM_LETTER ((unsigned char) c)];
 		  break;
 		}
@@ -2600,6 +2625,28 @@ constrain_operands (strict)
 #ifdef EXTRA_CONSTRAINT
 		  else if (EXTRA_CONSTRAINT (op, c))
 		    win = 1;
+
+		  if (EXTRA_MEMORY_CONSTRAINT (c))
+		    {
+		      /* Every memory operand can be reloaded to fit,
+			 so copy the condition from the 'm' case.  */
+		      if (GET_CODE (op) == MEM
+		          /* Before reload, accept what reload can turn into mem.  */
+		          || (strict < 0 && CONSTANT_P (op))
+		          /* During reload, accept a pseudo  */
+		          || (reload_in_progress && GET_CODE (op) == REG
+			      && REGNO (op) >= FIRST_PSEUDO_REGISTER))
+			win = 1;
+		    }
+		  if (EXTRA_ADDRESS_CONSTRAINT (c))
+		    {
+		      /* Every address operand can be reloaded to fit,
+			 so copy the condition from the 'p' case.  */
+		      if (strict <= 0
+		          || (strict_memory_address_p (recog_data.operand_mode[opno],
+						       op)))
+		        win = 1;
+		    }
 #endif
 		  break;
 		}
-- 
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