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Refactored *GVRequiresExtraLoad() to Subtarget method.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31887 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2006-11-21 00:01:06 +00:00
parent e04bf546e0
commit 12c49af81e
2 changed files with 109 additions and 120 deletions
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45
lib/Target/X86/X86ISelLowering.cpp
View File

@ -35,8 +35,6 @@
#include "llvm/ADT/StringExtras.h"
using namespace llvm;
static bool WindowsGVRequiresExtraLoad(GlobalValue *GV);
// FIXME: temporary.
static cl::opt<bool> EnableFastCC("enable-x86-fastcc", cl::Hidden,
cl::desc("Enable fastcc on X86"));
@ -655,8 +653,7 @@ SDOperand X86TargetLowering::LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG) {
// turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
// We should use extra load for direct calls to dllimported functions
if (!((Subtarget->isTargetCygwin() || Subtarget->isTargetWindows()) &&
WindowsGVRequiresExtraLoad(G->getGlobal())))
if (!Subtarget->GVRequiresExtraLoad(G->getGlobal(), true))
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), getPointerTy());
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy());
@ -1193,8 +1190,7 @@ X86TargetLowering::LowerX86_64CCCCallTo(SDOperand Op, SelectionDAG &DAG) {
// turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
// We should use extra load for direct calls to dllimported functions
if (!((Subtarget->isTargetCygwin() || Subtarget->isTargetWindows()) &&
WindowsGVRequiresExtraLoad(G->getGlobal())))
if (!Subtarget->GVRequiresExtraLoad(G->getGlobal(), true))
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), getPointerTy());
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy());
@ -1691,8 +1687,7 @@ SDOperand X86TargetLowering::LowerFastCCCallTo(SDOperand Op, SelectionDAG &DAG,
// turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
// We should use extra load for direct calls to dllimported functions
if (!((Subtarget->isTargetCygwin() || Subtarget->isTargetWindows()) &&
WindowsGVRequiresExtraLoad(G->getGlobal())))
if (!Subtarget->GVRequiresExtraLoad(G->getGlobal(), true))
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), getPointerTy());
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy());
@ -1990,8 +1985,7 @@ SDOperand X86TargetLowering::LowerStdCallCCCallTo(SDOperand Op,
// turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
// We should use extra load for direct calls to dllimported functions
if (!((Subtarget->isTargetCygwin() || Subtarget->isTargetWindows()) &&
WindowsGVRequiresExtraLoad(G->getGlobal())))
if (!Subtarget->GVRequiresExtraLoad(G->getGlobal(), true))
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), getPointerTy());
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy());
@ -2426,25 +2420,6 @@ static bool hasFPCMov(unsigned X86CC) {
}
}
/// DarwinGVRequiresExtraLoad - true if accessing the GV requires an extra
/// load. For Darwin, external and weak symbols are indirect, loading the value
/// at address GV rather then the value of GV itself. This means that the
/// GlobalAddress must be in the base or index register of the address, not the
/// GV offset field.
static bool DarwinGVRequiresExtraLoad(GlobalValue *GV) {
return (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
(GV->isExternal() && !GV->hasNotBeenReadFromBytecode()));
}
/// WindowsGVRequiresExtraLoad - true if accessing the GV requires an extra
/// load. For Windows, dllimported symbols are indirect, loading the value at
/// address GV rather then the value of GV itself. This means that the
/// GlobalAddress must be in the base or index register of the address, not the
/// GV offset field.
static bool WindowsGVRequiresExtraLoad(GlobalValue *GV) {
return (GV->hasDLLImportLinkage());
}
/// isUndefOrInRange - Op is either an undef node or a ConstantSDNode. Return
/// true if Op is undef or if its value falls within the specified range (L, H].
static bool isUndefOrInRange(SDOperand Op, unsigned Low, unsigned Hi) {
@ -3888,15 +3863,12 @@ X86TargetLowering::LowerGlobalAddress(SDOperand Op, SelectionDAG &DAG) {
// the GlobalAddress must be in the base or index register of the address,
// not the GV offset field.
if (getTargetMachine().getRelocationModel() != Reloc::Static &&
DarwinGVRequiresExtraLoad(GV))
Result = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), Result, NULL, 0);
} else if (Subtarget->isTargetCygwin() || Subtarget->isTargetWindows()) {
// FIXME: What about PIC?
if (WindowsGVRequiresExtraLoad(GV))
Subtarget->GVRequiresExtraLoad(GV, false))
Result = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), Result, NULL, 0);
} else if (Subtarget->GVRequiresExtraLoad(GV, false)) {
Result = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), Result, NULL, 0);
}
return Result;
}
@ -5020,7 +4992,7 @@ bool X86TargetLowering::isLegalAddressImmediate(GlobalValue *GV) const {
if (RModel == Reloc::Static)
return true;
else if (RModel == Reloc::DynamicNoPIC)
return !DarwinGVRequiresExtraLoad(GV);
return !(Subtarget->GVRequiresExtraLoad(GV, false));
else
return false;
} else
@ -5647,4 +5619,3 @@ X86TargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
return Res;
}

18
lib/Target/X86/X86Subtarget.h
View File

@ -14,6 +14,7 @@
#ifndef X86SUBTARGET_H
#define X86SUBTARGET_H
#include "llvm/GlobalValue.h"
#include "llvm/Target/TargetSubtarget.h"
#include <string>
@ -105,6 +106,23 @@ public:
bool isTargetELF() const { return TargetType == isELF; }
bool isTargetWindows() const { return TargetType == isWindows; }
bool isTargetCygwin() const { return TargetType == isCygwin; }
/// True if accessing the GV requires an extra load. For Windows, dllimported
/// symbols are indirect, loading the value at address GV rather then the
/// value of GV itself. This means that the GlobalAddress must be in the base
/// or index register of the address, not the GV offset field.
bool GVRequiresExtraLoad(const GlobalValue* GV, bool isDirectCall) const
{
if (isTargetDarwin()) {
return (!isDirectCall &&
(GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
(GV->isExternal() && !GV->hasNotBeenReadFromBytecode())));
} else if (isTargetCygwin() || isTargetWindows()) {
return (GV->hasDLLImportLinkage());
}
return false;
}
};
namespace X86 {