llvm-6502/lib/Target/Mips/MipsTargetMachine.cpp

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//===-- MipsTargetMachine.cpp - Define TargetMachine for Mips -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Implements the info about Mips target spec.
//
//===----------------------------------------------------------------------===//
#include "Mips.h"
#include "MipsTargetMachine.h"
#include "llvm/PassManager.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
extern "C" void LLVMInitializeMipsTarget() {
// Register the target.
RegisterTargetMachine<MipsTargetMachine> X(TheMipsTarget);
RegisterTargetMachine<MipselTargetMachine> Y(TheMipselTarget);
}
// DataLayout --> Big-endian, 32-bit pointer/ABI/alignment
// The stack is always 8 byte aligned
// On function prologue, the stack is created by decrementing
// its pointer. Once decremented, all references are done with positive
// offset from the stack/frame pointer, using StackGrowsUp enables
// an easier handling.
Several changes to Mips backend, experimental fp support being the most important. - Cleanup in the Subtarget info with addition of new features, not all support yet, but they allow the future inclusion of features easier. Among new features, we have : Arch family info (mips1, mips2, ...), ABI info (o32, eabi), 64-bit integer and float registers, allegrex vector FPU (VFPU), single float only support. - TargetMachine now detects allegrex core. - Added allegrex (Mips32r2) sext_inreg instructions. - *Added Float Point Instructions*, handling single float only, and aliased accesses for 32-bit FPUs. - Some cleanup in FP instruction formats and FP register classes. - Calling conventions improved to support mips 32-bit EABI. - Added Asm Printer support for fp cond codes. - Added support for sret copy to a return register. - EABI support added into LowerCALL and FORMAL_ARGS. - MipsFunctionInfo now keeps a virtual register per function to track the sret on function entry until function ret. - MipsInstrInfo FP support into methods (isMoveInstr, isLoadFromStackSlot, ...), FP cond codes mapping and initial FP Branch Analysis. - Two new Mips SDNode to handle fp branch and compare instructions : FPBrcond, FPCmp - MipsTargetLowering : handling different FP classes, Allegrex support, sret return copy, no homing location within EABI, non 32-bit stack objects arguments, and asm constraint for float. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53146 91177308-0d34-0410-b5e6-96231b3b80d8
2008-07-05 19:05:21 +00:00
// Using CodeModel::Large enables different CALL behavior.
MipsTargetMachine::
MipsTargetMachine(const Target &T, StringRef TT,
StringRef CPU, StringRef FS,
Reloc::Model RM, CodeModel::Model CM,
bool isLittle=false):
LLVMTargetMachine(T, TT, CPU, FS, RM, CM),
Subtarget(TT, CPU, FS, isLittle),
DataLayout(isLittle ?
std::string("e-p:32:32:32-i8:8:32-i16:16:32-i64:64:64-n32") :
std::string("E-p:32:32:32-i8:8:32-i16:16:32-i64:64:64-n32")),
InstrInfo(*this),
FrameLowering(Subtarget),
TLInfo(*this), TSInfo(*this), JITInfo() {
}
MipselTargetMachine::
MipselTargetMachine(const Target &T, StringRef TT,
StringRef CPU, StringRef FS,
Reloc::Model RM, CodeModel::Model CM) :
MipsTargetMachine(T, TT, CPU, FS, RM, CM, true) {}
// Install an instruction selector pass using
// the ISelDag to gen Mips code.
bool MipsTargetMachine::
addInstSelector(PassManagerBase &PM, CodeGenOpt::Level OptLevel)
{
PM.add(createMipsISelDag(*this));
return false;
}
// Implemented by targets that want to run passes immediately before
// machine code is emitted. return true if -print-machineinstrs should
// print out the code after the passes.
bool MipsTargetMachine::
addPreEmitPass(PassManagerBase &PM, CodeGenOpt::Level OptLevel)
{
PM.add(createMipsDelaySlotFillerPass(*this));
return true;
}
bool MipsTargetMachine::
addPreRegAlloc(PassManagerBase &PM, CodeGenOpt::Level OptLevel) {
PM.add(createMipsEmitGPRestorePass(*this));
return true;
}
bool MipsTargetMachine::
addPostRegAlloc(PassManagerBase &PM, CodeGenOpt::Level OptLevel) {
PM.add(createMipsExpandPseudoPass(*this));
return true;
}
bool MipsTargetMachine::addCodeEmitter(PassManagerBase &PM,
CodeGenOpt::Level OptLevel,
JITCodeEmitter &JCE) {
// Machine code emitter pass for Mips.
PM.add(createMipsJITCodeEmitterPass(*this, JCE));
return false;
}