Live Range Splitting after initial Register Allocation
After register allocation is done once, this pass targets
the variables that do not get registers, break them into
multiple variables with shorter (at most spanning a basic
block) live ranges. After discarding the new variables with
too few uses, the register allocator is run again and
the new variables that manage to get registers are inserted.
BUG=None
R=stichnot@chromium.org
Review URL: https://codereview.chromium.org/2172313002 .
diff --git a/src/IceTargetLowering.h b/src/IceTargetLowering.h
index ad2a63e..278b7a8 100644
--- a/src/IceTargetLowering.h
+++ b/src/IceTargetLowering.h
@@ -23,11 +23,12 @@
#ifndef SUBZERO_SRC_ICETARGETLOWERING_H
#define SUBZERO_SRC_ICETARGETLOWERING_H
-#include "IceDefs.h"
#include "IceBitVector.h"
#include "IceCfgNode.h"
+#include "IceDefs.h"
#include "IceInst.h" // for the names of the Inst subtypes
#include "IceOperand.h"
+#include "IceRegAlloc.h"
#include "IceTypes.h"
#include <utility>
@@ -290,6 +291,7 @@
virtual const SmallBitVector &getAliasesForRegister(RegNumT) const = 0;
void regAlloc(RegAllocKind Kind);
+ void postRegallocSplitting(const SmallBitVector &RegMask);
virtual void
makeRandomRegisterPermutation(llvm::SmallVectorImpl<RegNumT> &Permutation,