mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-01 04:29:57 +00:00
One unusual feature of the z architecture is that the result of a previous load can be reused indefinitely for subsequent loads, even if a cache-coherent store to that location is performed by another CPU. A special serializing instruction must be used if you want to force a load to be reattempted. Since volatile loads are not supposed to be omitted in this way, we should insert a serializing instruction before each such load. The same goes for atomic loads. The patch implements this at the IR->DAG boundary, in a similar way to atomic fences. It is a no-op for targets other than SystemZ. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196905 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
//===-- SystemZSubtarget.h - SystemZ subtarget information -----*- C++ -*--===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file declares the SystemZ specific subclass of TargetSubtargetInfo.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef SYSTEMZSUBTARGET_H
|
|
#define SYSTEMZSUBTARGET_H
|
|
|
|
#include "llvm/ADT/Triple.h"
|
|
#include "llvm/Target/TargetSubtargetInfo.h"
|
|
#include <string>
|
|
|
|
#define GET_SUBTARGETINFO_HEADER
|
|
#include "SystemZGenSubtargetInfo.inc"
|
|
|
|
namespace llvm {
|
|
class GlobalValue;
|
|
class StringRef;
|
|
|
|
class SystemZSubtarget : public SystemZGenSubtargetInfo {
|
|
virtual void anchor();
|
|
protected:
|
|
bool HasDistinctOps;
|
|
bool HasLoadStoreOnCond;
|
|
bool HasHighWord;
|
|
bool HasFPExtension;
|
|
bool HasFastSerialization;
|
|
|
|
private:
|
|
Triple TargetTriple;
|
|
|
|
public:
|
|
SystemZSubtarget(const std::string &TT, const std::string &CPU,
|
|
const std::string &FS);
|
|
|
|
// This is important for reducing register pressure in vector code.
|
|
virtual bool useAA() const LLVM_OVERRIDE { return true; }
|
|
|
|
// Automatically generated by tblgen.
|
|
void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
|
|
|
|
// Return true if the target has the distinct-operands facility.
|
|
bool hasDistinctOps() const { return HasDistinctOps; }
|
|
|
|
// Return true if the target has the load/store-on-condition facility.
|
|
bool hasLoadStoreOnCond() const { return HasLoadStoreOnCond; }
|
|
|
|
// Return true if the target has the high-word facility.
|
|
bool hasHighWord() const { return HasHighWord; }
|
|
|
|
// Return true if the target has the floating-point extension facility.
|
|
bool hasFPExtension() const { return HasFPExtension; }
|
|
|
|
// Return true if the target has the fast-serialization facility.
|
|
bool hasFastSerialization() const { return HasFastSerialization; }
|
|
|
|
// Return true if GV can be accessed using LARL for reloc model RM
|
|
// and code model CM.
|
|
bool isPC32DBLSymbol(const GlobalValue *GV, Reloc::Model RM,
|
|
CodeModel::Model CM) const;
|
|
|
|
bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
|
|
};
|
|
} // end namespace llvm
|
|
|
|
#endif
|