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

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a942946..3bb68a3 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+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.

diff --git a/gcc/flow.c b/gcc/flow.c
index e20e4b2..1bea9c2 100644 (file)
--- a/gcc/flow.c
+++ b/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;