Begin implementation of an inline spiller.

InlineSpiller inserts loads and spills immediately instead of deferring to
VirtRegMap. This is possible now because SlotIndexes allows instructions to be
inserted and renumbered.

This is work in progress, and is mostly a copy of TrivialSpiller so far. It
works very well for functions that don't require spilling.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107227 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 1 deletions

diff --git a/lib/CodeGen/Spiller.cpp b/lib/CodeGen/Spiller.cpp
index aed18ed9ac..f4d6024f97 100644
--- a/lib/CodeGen/Spiller.cpp
+++ b/lib/CodeGen/Spiller.cpp
@@ -26,7 +26,7 @@
 using namespace llvm;
 
 namespace {
-  enum SpillerName { trivial, standard, splitting };
+  enum SpillerName { trivial, standard, splitting, inline_ };
 }
 
 static cl::opt<SpillerName>
@@ -36,6 +36,7 @@ spillerOpt("spiller",
            cl::values(clEnumVal(trivial,   "trivial spiller"),
                       clEnumVal(standard,  "default spiller"),
                       clEnumVal(splitting, "splitting spiller"),
+                      "inline", inline_,   "inline spiller",
                       clEnumValEnd),
            cl::init(standard));
 
@@ -506,6 +507,13 @@ private:
 } // end anonymous namespace
 
 
+namespace llvm {
+Spiller *createInlineSpiller(MachineFunction*,
+                             LiveIntervals*,
+                             const MachineLoopInfo*,
+                             VirtRegMap*);
+}
+
 llvm::Spiller* llvm::createSpiller(MachineFunction *mf, LiveIntervals *lis,
                                    const MachineLoopInfo *loopInfo,
                                    VirtRegMap *vrm) {
@@ -514,5 +522,6 @@ llvm::Spiller* llvm::createSpiller(MachineFunction *mf, LiveIntervals *lis,
   case trivial: return new TrivialSpiller(mf, lis, vrm);
   case standard: return new StandardSpiller(lis, loopInfo, vrm);
   case splitting: return new SplittingSpiller(mf, lis, loopInfo, vrm);
+  case inline_: return createInlineSpiller(mf, lis, loopInfo, vrm);
   }
 }