Do not bias REG_N_REFS by loop_depth when optimising for size.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@33833 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/ChangeLog

+2000-05-10  Nick Clifton  <nickc@redhat.com>
+
+	* flow.c (find_auto_inc): Do not bias REG_N_REFS by loop_depth
+	when optimising for size.
+	(mark_used_regs:) Ditto.
+	(try_pre_increment_1): Ditto.
+
 2000-05-10  Zack Weinberg  <zack@wolery.cumb.org>
 	* cppexp.c (lex): Use %.*s to print non-NUL-terminated string.

gcc/flow.c

@@ -4854,7 +4854,8 @@ find_auto_inc (pbi, x, insn)
 	      /* Count an extra reference to the reg.  When a reg is
 		 incremented, spilling it is worse, so we want to make
 		 that less likely.  */
-	      REG_N_REFS (regno) += pbi->bb->loop_depth + 1;
+	      REG_N_REFS (regno) += (optimize_size ? 1
+				     : pbi->bb->loop_depth + 1);
 
 	      /* Count the increment as a setting of the register,
 		 even though it isn't a SET in rtl.  */
@@ -4935,7 +4936,8 @@ mark_used_reg (pbi, reg, cond, insn)
 	    REG_BASIC_BLOCK (regno) = REG_BLOCK_GLOBAL;
 
 	  /* Count (weighted) number of uses of each reg.  */
-	  REG_N_REFS (regno) += pbi->bb->loop_depth + 1;
+	  REG_N_REFS (regno) += (optimize_size ? 1
+				 : pbi->bb->loop_depth + 1);
 	}
     }
 
@@ -5353,7 +5355,8 @@ try_pre_increment_1 (pbi, insn)
 	 less likely.  */
       if (regno >= FIRST_PSEUDO_REGISTER)
 	{
-	  REG_N_REFS (regno) += pbi->bb->loop_depth + 1;
+	  REG_N_REFS (regno) += (optimize_size ? 1
+				 : pbi->bb->loop_depth + 1);
 	  REG_N_SETS (regno)++;
 	}
       return 1;