i386.c (ia32_multipass_dfa_lookahead): Default to issue rate for post-reload scheduling.

	* i386.c (ia32_multipass_dfa_lookahead): Default to issue rate
	for post-reload scheduling.

From-SVN: r253453

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 777340c..009a6eb 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2017-10-05  Jan Hubicka <hubicka@ucw.cz>
+
+       * i386.c (ia32_multipass_dfa_lookahead): Default to issue rate
+       for post-reload scheduling.
+
 2017-10-05  Tamar Christina  <tamar.christina@arm.com>
 
        * doc/sourcebuild.texi (vect_sizes_16B_8B, vect_sizes_32B_16B): New.

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 01115e9..e90cbfb 100644 (file)
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -30761,44 +30761,13 @@ ix86_adjust_cost (rtx_insn *insn, int dep_type, rtx_insn *dep_insn, int cost,
 static int
 ia32_multipass_dfa_lookahead (void)
 {
-  switch (ix86_tune)
-    {
-    case PROCESSOR_PENTIUM:
-    case PROCESSOR_LAKEMONT:
-      return 2;
-
-    case PROCESSOR_PENTIUMPRO:
-    case PROCESSOR_K6:
-      return 1;
-
-    case PROCESSOR_BDVER1:
-    case PROCESSOR_BDVER2:
-    case PROCESSOR_BDVER3:
-    case PROCESSOR_BDVER4:
-      /* We use lookahead value 4 for BD both before and after reload
-        schedules. Plan is to have value 8 included for O3. */
-        return 4;
-
-    case PROCESSOR_CORE2:
-    case PROCESSOR_NEHALEM:
-    case PROCESSOR_SANDYBRIDGE:
-    case PROCESSOR_HASWELL:
-    case PROCESSOR_BONNELL:
-    case PROCESSOR_SILVERMONT:
-    case PROCESSOR_KNL:
-    case PROCESSOR_KNM:
-    case PROCESSOR_INTEL:
-      /* Generally, we want haifa-sched:max_issue() to look ahead as far
-        as many instructions can be executed on a cycle, i.e.,
-        issue_rate.  I wonder why tuning for many CPUs does not do this.  */
-      if (reload_completed)
-        return ix86_issue_rate ();
-      /* Don't use lookahead for pre-reload schedule to save compile time.  */
-      return 0;
-
-    default:
-      return 0;
-    }
+  /* Generally, we want haifa-sched:max_issue() to look ahead as far
+     as many instructions can be executed on a cycle, i.e.,
+     issue_rate.  */
+  if (reload_completed)
+    return ix86_issue_rate ();
+  /* Don't use lookahead for pre-reload schedule to save compile time.  */
+  return 0;
 }
 
 /* Return true if target platform supports macro-fusion.  */