[llvm-commits] [llvm] r44671 - /llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp

[Evan Cheng]

Author: evancheng
Date: Thu Dec  6 18:28:32 2007
New Revision: 44671

URL: http://llvm.org/viewvc/llvm-project?rev=44671&view=rev
Log:
Add an option to control this heuristic tweak so I can test it.

Modified:
    llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp

Modified: llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp
URL: 
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp?rev=44671&r1=44670&r2=44671&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp (original)
+++ llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp Thu Dec  6 18:28:32 2007
@@ -52,6 +52,11 @@
                 cl::desc("Use new coalescer heuristic"),
                 cl::init(false));
 
+  static cl::opt<bool>
+  ReMatSpillWeight("tweak-remat-spill-weight",
+                   cl::desc("Tweak spill weight of re-materializable 
intervals"),
+                   cl::init(true));
+
   RegisterPass<SimpleRegisterCoalescing> 
   X("simple-register-coalescing", "Simple Register Coalescing");
 
@@ -1487,7 +1492,7 @@
         LI.weight = HUGE_VALF;
       else {
         bool isLoad = false;
-        if (li_->isReMaterializable(LI, isLoad)) {
+        if (ReMatSpillWeight && li_->isReMaterializable(LI, isLoad)) {
           // If all of the definitions of the interval are re-materializable,
           // it is a preferred candidate for spilling. If non of the defs are
           // loads, then it's potentially very cheap to re-materialize.


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