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JumpTable support! What this represents is working asm and jit support for

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x86 and ppc for 100% dense switch statements when relocations are non-PIC.
This support will be extended and enhanced in the coming days to support
PIC, and less dense forms of jump tables.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27947 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
2006-04-22 18:53:45 +00:00
parent 1900c012f5
commit 37efe67645
40 changed files with 717 additions and 77 deletions
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36
lib/CodeGen/MachineFunction.cpp
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@ -18,6 +18,7 @@
#include "llvm/CodeGen/SSARegMap.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetFrameInfo.h"
@ -113,6 +114,7 @@ MachineFunction::MachineFunction(const Function *F,
MFInfo = 0;
FrameInfo = new MachineFrameInfo();
ConstantPool = new MachineConstantPool(TM.getTargetData());
JumpTableInfo = new MachineJumpTableInfo(TM.getTargetData());
BasicBlocks.Parent = this;
}
@ -122,6 +124,7 @@ MachineFunction::~MachineFunction() {
delete MFInfo;
delete FrameInfo;
delete ConstantPool;
delete JumpTableInfo;
delete[] UsedPhysRegs;
}
@ -132,6 +135,9 @@ void MachineFunction::print(std::ostream &OS) const {
// Print Frame Information
getFrameInfo()->print(*this, OS);
// Print JumpTable Information
getJumpTableInfo()->print(OS);
// Print Constant Pool
getConstantPool()->print(OS);
@ -333,6 +339,36 @@ void MachineFrameInfo::dump(const MachineFunction &MF) const {
}
//===----------------------------------------------------------------------===//
// MachineJumpTableInfo implementation
//===----------------------------------------------------------------------===//
/// getJumpTableIndex - Create a new jump table entry in the jump table info
/// or return an existing one.
///
unsigned MachineJumpTableInfo::getJumpTableIndex(
std::vector<MachineBasicBlock*> &DestBBs) {
for (unsigned i = 0, e = JumpTables.size(); i != e; ++i)
if (JumpTables[i].MBBs == DestBBs)
return i;
JumpTables.push_back(MachineJumpTableEntry(DestBBs));
return JumpTables.size()-1;
}
void MachineJumpTableInfo::print(std::ostream &OS) const {
// FIXME: this is lame, maybe we could print out the MBB numbers or something
// like {1, 2, 4, 5, 3, 0}
for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) {
OS << " <jt #" << i << "> has " << JumpTables[i].MBBs.size()
<< " entries\n";
}
}
void MachineJumpTableInfo::dump() const { print(std::cerr); }
//===----------------------------------------------------------------------===//
// MachineConstantPool implementation
//===----------------------------------------------------------------------===//