alias.c (static_reg_base_value): New to hold RTL for items allocated once per function for the aliasing code.

	* alias.c (static_reg_base_value): New to hold RTL for
	items allocated once per function for the aliasing code.
	(init_alias_once_per_function): Initialize static_reg_base_value.
	(init_alias_analysis): Avoid throw-away allocations of RTL by
	using pre-computed values in static_reg_base_value.
	* function.c (prepare_function_start): Call
	init_alias_once_per_function appropriately.
	* rtl.h (init_alias_once_per_function): Declare.
	* caller-save (init_caller_save): Restructure slightly to
	avoid lots of silly RTL generation.
	* expr.c (init_expr_once): Likewise.
	* reload1.c (reload_cse_regs_1): Allocate throw-away register
	RTL object here.  Pass it into children.
	(reload_cse_simplify_operands): Use passed-in register RTL
	object.
	(reload_cse_simplify): Pass through throw-away register
	RTL object.

From-SVN: r54442

1 files changed, 7 insertions, 2 deletions

diff --git a/gcc/expr.c b/gcc/expr.c
index b719956..d7dc531 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -214,6 +214,7 @@ init_expr_once ()
   enum machine_mode mode;
   int num_clobbers;
   rtx mem, mem1;
+  rtx reg;
 
   /* Try indexing by frame ptr and try by stack ptr.
      It is known that on the Convex the stack ptr isn't a valid index.
@@ -221,6 +222,10 @@ init_expr_once ()
   mem = gen_rtx_MEM (VOIDmode, stack_pointer_rtx);
   mem1 = gen_rtx_MEM (VOIDmode, frame_pointer_rtx);
 
+  /* A scratch register we can modify in-place below to avoid
+     useless RTL allocations.  */
+  reg = gen_rtx_REG (VOIDmode, -1);
+
   insn = rtx_alloc (INSN);
   pat = gen_rtx_SET (0, NULL_RTX, NULL_RTX);
   PATTERN (insn) = pat;
@@ -229,11 +234,11 @@ init_expr_once ()
        mode = (enum machine_mode) ((int) mode + 1))
     {
       int regno;
-      rtx reg;
 
       direct_load[(int) mode] = direct_store[(int) mode] = 0;
       PUT_MODE (mem, mode);
       PUT_MODE (mem1, mode);
+      PUT_MODE (reg, mode);
 
       /* See if there is some register that can be used in this mode and
 	 directly loaded or stored from memory.  */
@@ -246,7 +251,7 @@ init_expr_once ()
 	    if (! HARD_REGNO_MODE_OK (regno, mode))
 	      continue;
 
-	    reg = gen_rtx_REG (mode, regno);
+	    REGNO (reg) = regno;
 
 	    SET_SRC (pat) = mem;
 	    SET_DEST (pat) = reg;