Add SplitAnalysis::getNumLiveBlocks().

It is important that this function returns the same number of live blocks as
countLiveBlocks(CurLI) because live range splitting uses the number of live
blocks to ensure it is making progress.

This is in preparation of supporting duplicate UseBlock entries for basic blocks
that have a virtual register live-in and live-out, but not live-though.

llvm-svn: 132244

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SplitKit.cpp b/llvm/lib/CodeGen/SplitKit.cpp
index 55ae97c792a..53141b54c9f 100644
--- a/llvm/lib/CodeGen/SplitKit.cpp
+++ b/llvm/lib/CodeGen/SplitKit.cpp
@@ -224,6 +224,8 @@ bool SplitAnalysis::calcLiveBlockInfo() {
     else
       MFI = LIS.getMBBFromIndex(LVI->start);
   }
+
+  assert(getNumLiveBlocks() == countLiveBlocks(CurLI) && "Bad block count");
   return true;
 }