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Enable rematerialization of constants using AliasAnalysis::pointsToConstantMemory,

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and knowledge of PseudoSourceValues. This unfortunately isn't sufficient to allow
constants to be rematerialized in PIC mode -- the extra indirection is a
complication.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54000 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-07-25 00:02:30 +00:00
parent 3eee6542f5
commit 6d69ba8a69
6 changed files with 141 additions and 16 deletions
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20
lib/CodeGen/PseudoSourceValue.cpp
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@ -11,6 +11,7 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Support/Compiler.h"
@ -51,6 +52,9 @@ namespace llvm {
const int FI;
public:
explicit FixedStackPseudoSourceValue(int fi) : FI(fi) {}
virtual bool isConstant(const MachineFrameInfo *MFI) const;
virtual void print(std::ostream &OS) const {
OS << "FixedStack" << FI;
}
@ -64,4 +68,20 @@ namespace llvm {
V = new FixedStackPseudoSourceValue(FI);
return V;
}
bool PseudoSourceValue::isConstant(const MachineFrameInfo *) const {
if (this == getStack())
return false;
if (this == getGOT() ||
this == getConstantPool() ||
this == getJumpTable())
return true;
assert(0 && "Unknown PseudoSourceValue!");
return false;
}
bool
FixedStackPseudoSourceValue::isConstant(const MachineFrameInfo *MFI) const {
return MFI && MFI->isImmutableObjectIndex(FI);
}
}