Mercurial > hg > truffle

diff src/share/vm/opto/compile.cpp @ 418:72c5366e5d86

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
6743900: frequency based block layout Summary: post-register allocation pass that drives block layout by edge frequencies Reviewed-by: never, kvn
author rasbold
date Thu, 06 Nov 2008 14:59:10 -0800
parents f4fe12e429a4
children a1980da045cc
line wrap: on
line diff
--- a/src/share/vm/opto/compile.cpp	Thu Oct 30 17:08:48 2008 -0700
+++ b/src/share/vm/opto/compile.cpp	Thu Nov 06 14:59:10 2008 -0800
@@ -822,6 +822,7 @@
   Copy::zero_to_bytes(_trap_hist, sizeof(_trap_hist));
   set_decompile_count(0);
 
+  set_do_freq_based_layout(BlockLayoutByFrequency || method_has_option("BlockLayoutByFrequency"));
   // Compilation level related initialization
   if (env()->comp_level() == CompLevel_fast_compile) {
     set_num_loop_opts(Tier1LoopOptsCount);
@@ -1701,8 +1702,14 @@
   // are not adding any new instructions.  If any basic block is empty, we
   // can now safely remove it.
   {
-    NOT_PRODUCT( TracePhase t2("removeEmpty", &_t_removeEmptyBlocks, TimeCompiler); )
-    cfg.RemoveEmpty();
+    NOT_PRODUCT( TracePhase t2("blockOrdering", &_t_blockOrdering, TimeCompiler); )
+    cfg.remove_empty();
+    if (do_freq_based_layout()) {
+      PhaseBlockLayout layout(cfg);
+    } else {
+      cfg.set_loop_alignment();
+    }
+    cfg.fixup_flow();
   }
 
   // Perform any platform dependent postallocation verifications.