It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCHazardRecognizers.h b/lib/Target/PowerPC/PPCHazardRecognizers.h
new file mode 100644
index 0000000..cbff943
--- /dev/null
+++ b/lib/Target/PowerPC/PPCHazardRecognizers.h
@@ -0,0 +1,73 @@
+//===-- PPCHazardRecognizers.h - PowerPC Hazard Recognizers -----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Chris Lattner and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines hazard recognizers for scheduling on PowerPC processors.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef PPCHAZRECS_H
+#define PPCHAZRECS_H
+
+#include "llvm/CodeGen/ScheduleDAG.h"
+#include "PPCInstrInfo.h"
+
+namespace llvm {
+
+/// PPCHazardRecognizer970 - This class defines a finite state automata that
+/// models the dispatch logic on the PowerPC 970 (aka G5) processor. This
+/// promotes good dispatch group formation and implements noop insertion to
+/// avoid structural hazards that cause significant performance penalties (e.g.
+/// setting the CTR register then branching through it within a dispatch group),
+/// or storing then loading from the same address within a dispatch group.
+class PPCHazardRecognizer970 : public HazardRecognizer {
+ const TargetInstrInfo &TII;
+
+ unsigned NumIssued; // Number of insts issued, including advanced cycles.
+
+ // Various things that can cause a structural hazard.
+
+ // HasCTRSet - If the CTR register is set in this group, disallow BCTRL.
+ bool HasCTRSet;
+
+ // StoredPtr - Keep track of the address of any store. If we see a load from
+ // the same address (or one that aliases it), disallow the store. We can have
+ // up to four stores in one dispatch group, hence we track up to 4.
+ //
+ // This is null if we haven't seen a store yet. We keep track of both
+ // operands of the store here, since we support [r+r] and [r+i] addressing.
+ SDOperand StorePtr1[4], StorePtr2[4];
+ unsigned StoreSize[4];
+ unsigned NumStores;
+
+public:
+ PPCHazardRecognizer970(const TargetInstrInfo &TII);
+ virtual HazardType getHazardType(SDNode *Node);
+ virtual void EmitInstruction(SDNode *Node);
+ virtual void AdvanceCycle();
+ virtual void EmitNoop();
+
+private:
+ /// EndDispatchGroup - Called when we are finishing a new dispatch group.
+ ///
+ void EndDispatchGroup();
+
+ /// GetInstrType - Classify the specified powerpc opcode according to its
+ /// pipeline.
+ PPCII::PPC970_Unit GetInstrType(unsigned Opcode,
+ bool &isFirst, bool &isSingle,bool &isCracked,
+ bool &isLoad, bool &isStore);
+
+ bool isLoadOfStoredAddress(unsigned LoadSize,
+ SDOperand Ptr1, SDOperand Ptr2) const;
+};
+
+} // end namespace llvm
+
+#endif
+