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https://github.com/c64scene-ar/llvm-6502.git
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349baa6039
useAA significantly improves the handling of vector code that has TBAA information attached. It also helps other cases, as shown by the testsuite changes here. The only real downside I've seen is that it interferes with MergeConsecutiveStores. The problem is that that optimization works top down, starting at the first store in the chain, and looks for cases where the chain result is only used by a single related store. These related stores don't alias, so useAA will have rewritten all the later stores to use a different chain input (typically the same one as the first store). I think the advantages outweigh the disadvantages though, so for now I've just disabled alias analysis for the unaligned-01.ll test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193521 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
//===-- SystemZSubtarget.h - SystemZ subtarget information -----*- C++ -*--===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the SystemZ specific subclass of TargetSubtargetInfo.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SYSTEMZSUBTARGET_H
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#define SYSTEMZSUBTARGET_H
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#include "llvm/ADT/Triple.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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#include <string>
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#define GET_SUBTARGETINFO_HEADER
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#include "SystemZGenSubtargetInfo.inc"
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namespace llvm {
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class GlobalValue;
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class StringRef;
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class SystemZSubtarget : public SystemZGenSubtargetInfo {
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protected:
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bool HasDistinctOps;
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bool HasLoadStoreOnCond;
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bool HasHighWord;
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bool HasFPExtension;
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private:
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Triple TargetTriple;
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public:
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SystemZSubtarget(const std::string &TT, const std::string &CPU,
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const std::string &FS);
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// This is important for reducing register pressure in vector code.
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virtual bool useAA() const LLVM_OVERRIDE { return true; }
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// Automatically generated by tblgen.
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void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
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// Return true if the target has the distinct-operands facility.
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bool hasDistinctOps() const { return HasDistinctOps; }
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// Return true if the target has the load/store-on-condition facility.
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bool hasLoadStoreOnCond() const { return HasLoadStoreOnCond; }
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// Return true if the target has the high-word facility.
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bool hasHighWord() const { return HasHighWord; }
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// Return true if the target has the floating-point extension facility.
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bool hasFPExtension() const { return HasFPExtension; }
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// Return true if GV can be accessed using LARL for reloc model RM
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// and code model CM.
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bool isPC32DBLSymbol(const GlobalValue *GV, Reloc::Model RM,
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CodeModel::Model CM) const;
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bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
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};
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} // end namespace llvm
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#endif
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