Subzero: Control whether deleted instructions are retained.

src/IceCfg.cpp

Index: src/IceCfg.cpp
diff --git a/src/IceCfg.cpp b/src/IceCfg.cpp
index c3d91e65c3f3d24a283a2cfefbe4fcab6469693b..4f7a5a527d85c4b5e7ac2479a6e5720d1df394e0 100644
--- a/src/IceCfg.cpp
+++ b/src/IceCfg.cpp
@@ -271,6 +271,14 @@ void Cfg::computeInOutEdges() {
     Node->validatePhis();
 }
 
+/// Renumber the non-deleted instructions in the Cfg.  This needs to be done in
+/// preparation for live range analysis.  The instruction numbers in a block
+/// must be monotonically increasing.  The range of instruction numbers in a
+/// block, from lowest to highest, must not overlap with the range of any other
+/// block.
+///
+/// Also, if the configuration specifies to do so, remove/unlink all deleted
+/// instructions from the Cfg, to speed up later passes over the instructions.

[John, 2016/03/14 13:27:15]

Maybe document the .h file instead?

[Jim Stichnoth, 2016/03/14 13:51:15]

Done.

 void Cfg::renumberInstructions() {
   TimerMarker T(TimerStack::TT_renumberInstructions, this);
   NextInstNumber = Inst::NumberInitial;