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eliminate the TargetLowering::UsesGlobalOffsetTable bool, which is

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subsumed by TargetLowering::getJumpTableEncoding().  Change uses of
it to be more specific.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94529 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-26 06:53:37 +00:00
parent 3b131d7cc4
commit f1214cbf3c
5 changed files with 11 additions and 28 deletions
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12
include/llvm/Target/TargetLowering.h
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@ -118,10 +118,6 @@ public:
MVT getPointerTy() const { return PointerTy; }
MVT getShiftAmountTy() const { return ShiftAmountTy; }
/// usesGlobalOffsetTable - Return true if this target uses a GOT for PIC
/// codegen.
bool usesGlobalOffsetTable() const { return UsesGlobalOffsetTable; }
/// isSelectExpensive - Return true if the select operation is expensive for
/// this target.
bool isSelectExpensive() const { return SelectIsExpensive; }
@ -908,10 +904,6 @@ public:
//
protected:
/// setUsesGlobalOffsetTable - Specify that this target does or doesn't use a
/// GOT for PC-relative code.
void setUsesGlobalOffsetTable(bool V) { UsesGlobalOffsetTable = V; }
/// setShiftAmountType - Describe the type that should be used for shift
/// amounts. This type defaults to the pointer type.
void setShiftAmountType(MVT VT) { ShiftAmountTy = VT; }
@ -1594,10 +1586,6 @@ private:
///
bool IsLittleEndian;
/// UsesGlobalOffsetTable - True if this target uses a GOT for PIC codegen.
///
bool UsesGlobalOffsetTable;
/// SelectIsExpensive - Tells the code generator not to expand operations
/// into sequences that use the select operations if possible.
bool SelectIsExpensive;

17
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
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@ -481,18 +481,19 @@ void AsmPrinter::EmitJumpTableInfo(MachineFunction &MF) {
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
if (JT.empty()) return;
bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
// Pick the directive to use to print the jump table entries, and switch to
// the appropriate section.
const Function *F = MF.getFunction();
bool JTInDiffSection = false;
if (F->isWeakForLinker() ||
(IsPic && !TM.getTargetLowering()->usesGlobalOffsetTable())) {
// In PIC mode, we need to emit the jump table to the same section as the
// function body itself, otherwise the label differences won't make sense.
// We should also do if the section name is NULL or function is declared in
// discardable section.
if (// In PIC mode, we need to emit the jump table to the same section as the
// function body itself, otherwise the label differences won't make sense.
// FIXME: Need a better predicate for this: what about custom entries?
MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
// We should also do if the section name is NULL or function is declared
// in discardable section
// FIXME: this isn't the right predicate, should be based on the MCSection
// for the function.
F->isWeakForLinker()) {
OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
TM));
} else {

5
lib/CodeGen/SelectionDAG/TargetLowering.cpp
View File

@ -510,7 +510,6 @@ TargetLowering::TargetLowering(TargetMachine &tm,TargetLoweringObjectFile *tlof)
setOperationAction(ISD::TRAP, MVT::Other, Expand);
IsLittleEndian = TD->isLittleEndian();
UsesGlobalOffsetTable = false;
ShiftAmountTy = PointerTy = MVT::getIntegerVT(8*TD->getPointerSize());
memset(RegClassForVT, 0,MVT::LAST_VALUETYPE*sizeof(TargetRegisterClass*));
memset(TargetDAGCombineArray, 0, array_lengthof(TargetDAGCombineArray));
@ -814,8 +813,8 @@ unsigned TargetLowering::getJumpTableEncoding() const {
SDValue TargetLowering::getPICJumpTableRelocBase(SDValue Table,
SelectionDAG &DAG) const {
// FIXME: Eliminate usesGlobalOffsetTable() in favor of JTEntryKind.
if (usesGlobalOffsetTable())
// If our PIC model is GP relative, use the global offset table as the base.
if (getJumpTableEncoding() == MachineJumpTableInfo::EK_GPRel32BlockAddress)
return DAG.getGLOBAL_OFFSET_TABLE(getPointerTy());
return Table;
}

2
lib/Target/Alpha/AlphaISelLowering.cpp
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@ -49,8 +49,6 @@ AlphaTargetLowering::AlphaTargetLowering(TargetMachine &TM)
setShiftAmountType(MVT::i64);
setBooleanContents(ZeroOrOneBooleanContent);
setUsesGlobalOffsetTable(true);
addRegisterClass(MVT::i64, Alpha::GPRCRegisterClass);
addRegisterClass(MVT::f64, Alpha::F8RCRegisterClass);
addRegisterClass(MVT::f32, Alpha::F4RCRegisterClass);

3
lib/Target/Mips/MipsISelLowering.cpp
View File

@ -60,9 +60,6 @@ MipsTargetLowering(MipsTargetMachine &TM)
// setcc operations results (slt, sgt, ...).
setBooleanContents(ZeroOrOneBooleanContent);
// JumpTable targets must use GOT when using PIC_
setUsesGlobalOffsetTable(true);
// Set up the register classes
addRegisterClass(MVT::i32, Mips::CPURegsRegisterClass);
addRegisterClass(MVT::f32, Mips::FGR32RegisterClass);