[llvm-commits] [llvm] r48567 - /llvm/trunk/lib/Transforms/Scalar/LoopUnroll.cpp

[Devang Patel]

Author: dpatel
Date: Wed Mar 19 18:05:52 2008
New Revision: 48567

URL: http://llvm.org/viewvc/llvm-project?rev=48567&view=rev
Log:
Add comment.

Modified:
    llvm/trunk/lib/Transforms/Scalar/LoopUnroll.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/LoopUnroll.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/LoopUnroll.cpp?rev=48567&r1=48566&r2=48567&view=diff

==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopUnroll.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/LoopUnroll.cpp Wed Mar 19 18:05:52 2008
@@ -101,6 +101,10 @@
       } else if (isa<DbgInfoIntrinsic>(I)) {
         // Ignore debug instructions
       } else if (isa<CallInst>(I)) {
+        // Estimate size overhead introduced by call instructions which
+        // is higher than other instructions. Here 3 and 10 are magic
+        // numbers that help one isolated test case from PR2067 without
+        // negatively impacting measured benchmarks.
         if (isa<IntrinsicInst>(I))
           Size = Size + 3;
         else