loop.h (struct loop_mem_info): Move from loop.c (struct loop_info): Add fields store_mems...

	* loop.h (struct loop_mem_info): Move from loop.c
	(struct loop_info): Add fields store_mems, mems, mems_idx,
	mems_allocated, unknown_address_altered,
	unknown_constant_address_altered, num_mem_sets, and
	first_loop_store_insn.

	* loop.c (loop_store_mems): Replace with field in loop_info struct.
	(loop_mems, loop_mems_idx, loop_mems_allocated): Likewise.
	(unknown_address_altered, unknown_constant_address_altered): Likewise.
	(num_mem_sets): Likewise.
 	(replace_loop_mems, replace_loop_regs): New.
	(struct loop_replace_args): New.
	(load_mems): Use replace_loop_mems.
	(try_copy_prop): Use replace_loop_regs.
	(replace_loop_reg, replace_loop_mem): Use loop_replace_args structure.

From-SVN: r36284

gcc/ChangeLog

+2000-09-11  Michael Hayes  <mhayes@cygnus.com>
+
+	* loop.h (struct loop_mem_info): Move from loop.c
+	(struct loop_info): Add fields store_mems, mems, mems_idx,
+	mems_allocated, unknown_address_altered,
+	unknown_constant_address_altered, num_mem_sets, and
+	first_loop_store_insn.
+
+	* loop.c (loop_store_mems): Replace with field in loop_info struct.
+	(loop_mems, loop_mems_idx, loop_mems_allocated): Likewise.
+	(unknown_address_altered, unknown_constant_address_altered): Likewise.
+	(num_mem_sets): Likewise.
+ 	(replace_loop_mems, replace_loop_regs): New.
+	(struct loop_replace_args): New.
+	(load_mems): Use replace_loop_mems.
+	(try_copy_prop): Use replace_loop_regs.
+	(replace_loop_reg, replace_loop_mem): Use loop_replace_args structure.
+
 2000-09-09  Stephane Carrez  <Stephane.Carrez@worldnet.fr>
 
 	* configure.in: Recognize m6811-elf and m6812-elf.

gcc/loop.h

@@ -164,6 +164,15 @@ struct iv_class {
 				   biv controls. */
 };
 
+
+typedef struct loop_mem_info
+{
+  rtx mem;      /* The MEM itself.  */
+  rtx reg;      /* Corresponding pseudo, if any.  */
+  int optimize; /* Nonzero if we can optimize access to this MEM.  */
+} loop_mem_info;
+
+
 /* Information required to calculate the number of loop iterations. 
    This is set by loop_iterations.  */
 
@@ -207,6 +216,30 @@ struct loop_info
   /* The number of times the loop body was unrolled.  */
   unsigned int unroll_number;
   int used_count_register;
+  /* List of MEMs that are stored in this loop.  */
+  rtx store_mems;
+  /* Array of MEMs that are used (read or written) in this loop, but
+     cannot be aliased by anything in this loop, except perhaps
+     themselves.  In other words, if mems[i] is altered during
+     the loop, it is altered by an expression that is rtx_equal_p to
+     it.  */
+  loop_mem_info *mems;
+  /* The index of the next available slot in MEMS.  */
+  int mems_idx;
+  /* The number of elements allocated in MEMS.  */
+  int mems_allocated;
+  /* Nonzero if we don't know what MEMs were changed in the current
+     loop.  This happens if the loop contains a call (in which case
+     `has_call' will also be set) or if we store into more than
+     NUM_STORES MEMs.  */
+  int unknown_address_altered;
+  /* The above doesn't count any readonly memory locations that are
+     stored.  This does.  */
+  int unknown_constant_address_altered;
+  /* Count of memory write instructions discovered in the loop.  */
+  int num_mem_sets;
+  /* The insn where the first of these was found.  */
+  rtx first_loop_store_insn;
 };
 
 /* Definitions used by the basic induction variable discovery code.  */