combine: Use insn_cost instead of pattern_cost everywhere

	* combine.c (combine_validate_cost): Compute the new insn_cost,
	not just pattern_cost.
	(try_combine): Adjust comment.

From-SVN: r253561

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index cf83fd95aff0066350c0bc1bb909e5cb2bce78f4..dfb19231a981bcc9ea20c83f5967e446257b66de 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-10-09  Segher Boessenkool  <segher@kernel.crashing.org>
+
+       * combine.c (combine_validate_cost): Compute the new insn_cost,
+       not just pattern_cost.
+       (try_combine): Adjust comment.
+
 2017-10-09  Segher Boessenkool  <segher@kernel.crashing.org>
 
        * cfgrtl.c (rtl_account_profile_record): Replace insn_rtx_cost with

diff --git a/gcc/combine.c b/gcc/combine.c
index 5f1cbca9550aa09e7dde21547ada6f4616c19fad..b89ee6da345b2f0db90d12ee79905d39ac0b5046 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -856,7 +856,7 @@ combine_validate_cost (rtx_insn *i0, rtx_insn *i1, rtx_insn *i2, rtx_insn *i3,
   int new_i2_cost, new_i3_cost;
   int old_cost, new_cost;
 
-  /* Lookup the original insn_rtx_costs.  */
+  /* Lookup the original insn_costs.  */
   i2_cost = INSN_COST (i2);
   i3_cost = INSN_COST (i3);
 
@@ -888,11 +888,23 @@ combine_validate_cost (rtx_insn *i0, rtx_insn *i1, rtx_insn *i2, rtx_insn *i3,
     old_cost -= i1_cost;
 
 
-  /* Calculate the replacement pattern_costs.  */
-  new_i3_cost = pattern_cost (newpat, optimize_this_for_speed_p);
+  /* Calculate the replacement insn_costs.  */
+  rtx tmp = PATTERN (i3);
+  PATTERN (i3) = newpat;
+  int tmpi = INSN_CODE (i3);
+  INSN_CODE (i3) = -1;
+  new_i3_cost = insn_cost (i3, optimize_this_for_speed_p);
+  PATTERN (i3) = tmp;
+  INSN_CODE (i3) = tmpi;
   if (newi2pat)
     {
-      new_i2_cost = pattern_cost (newi2pat, optimize_this_for_speed_p);
+      tmp = PATTERN (i2);
+      PATTERN (i2) = newi2pat;
+      tmpi = INSN_CODE (i2);
+      INSN_CODE (i2) = -1;
+      new_i2_cost = insn_cost (i2, optimize_this_for_speed_p);
+      PATTERN (i2) = tmp;
+      INSN_CODE (i2) = tmpi;
       new_cost = (new_i2_cost > 0 && new_i3_cost > 0)
                 ? new_i2_cost + new_i3_cost : 0;
     }
@@ -907,7 +919,14 @@ combine_validate_cost (rtx_insn *i0, rtx_insn *i1, rtx_insn *i2, rtx_insn *i3,
       int old_other_cost, new_other_cost;
 
       old_other_cost = INSN_COST (undobuf.other_insn);
-      new_other_cost = pattern_cost (newotherpat, optimize_this_for_speed_p);
+      tmp = PATTERN (undobuf.other_insn);
+      PATTERN (undobuf.other_insn) = newotherpat;
+      tmpi = INSN_CODE (undobuf.other_insn);
+      INSN_CODE (undobuf.other_insn) = -1;
+      new_other_cost = insn_cost (undobuf.other_insn,
+                                 optimize_this_for_speed_p);
+      PATTERN (undobuf.other_insn) = tmp;
+      INSN_CODE (undobuf.other_insn) = tmpi;
       if (old_other_cost > 0 && new_other_cost > 0)
        {
          old_cost += old_other_cost;
@@ -4080,7 +4099,7 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1, rtx_insn *i0,
        }
     }
 
-  /* Only allow this combination if insn_rtx_costs reports that the
+  /* Only allow this combination if insn_cost reports that the
      replacement instructions are cheaper than the originals.  */
   if (!combine_validate_cost (i0, i1, i2, i3, newpat, newi2pat, other_pat))
     {