Implement single block splitting.
Before spilling a live range, we split it into a separate range for each basic
block where it is used. That way we only get one reload per basic block if the
new smaller ranges can allocate to a register.
This type of splitting is already present in the standard spiller.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110934 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/InlineSpiller.cpp b/lib/CodeGen/InlineSpiller.cpp
index 63a89aa..7978372 100644
--- a/lib/CodeGen/InlineSpiller.cpp
+++ b/lib/CodeGen/InlineSpiller.cpp
@@ -118,6 +118,15 @@
.splitAroundLoop(loop))
return true;
}
+
+ // Try splitting into single block intervals.
+ SplitAnalysis::BlockPtrSet blocks;
+ if (splitAnalysis_.getMultiUseBlocks(blocks)) {
+ if (SplitEditor(splitAnalysis_, lis_, vrm_, *newIntervals_)
+ .splitSingleBlocks(blocks))
+ return true;
+ }
+
return false;
}