commit 11c9a325399b282cb4ea7d1d24d42fceeec2a09a
author Andrew Scull <ascull@google.com> Fri Aug 28 14:24:14 2015 -0700
committer Andrew Scull <ascull@google.com> Fri Aug 28 14:24:14 2015 -0700
tree 351ff0336a0789b72500fde2c83a9426a4e9ba3a
parent 25529f7bdaf3dfa08455b87642a120e84961d6d6

Weight variables for register allocation by their number of uses.

Count the number of instructions that use a variable following the heuristic
that more uses implies higher register priority. This is currently very simple
but is precursor work for weighting variables by loop nest depth.

BUG=
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/1312433004.

src/IceCfg.cpp

diff --git a/src/IceCfg.cpp b/src/IceCfg.cpp
index cf7be3b..5797fdc 100644
--- a/src/IceCfg.cpp
+++ b/src/IceCfg.cpp
@@ -765,7 +765,7 @@
         Str << getVMetadata()->isMultiBlock(Var);
       else
         Str << "?";
-      Str << " weight=" << Var->getWeight() << " ";
+      Str << " weight=" << Var->getWeight(this) << " ";
       Var->dump(this);
       Str << " LIVE=" << Var->getLiveRange() << "\n";
     }