mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-31 12:30:06 +00:00
Creates a configurable regalloc pipeline. Ensure specific llc options do what they say and nothing more: -reglloc=... has no effect other than selecting the allocator pass itself. This patch introduces a new umbrella flag, "-optimize-regalloc", to enable/disable the optimizing regalloc "superpass". This allows for example testing coalscing and scheduling under -O0 or vice-versa. When a CodeGen pass requires the MachineFunction to have a particular property, we need to explicitly define that property so it can be directly queried rather than naming a specific Pass. For example, to check for SSA, use MRI->isSSA, not addRequired<PHIElimination>. CodeGen transformation passes are never "required" as an analysis ProcessImplicitDefs does not require LiveVariables. We have a plan to massively simplify some of the early passes within the regalloc superpass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150226 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
//===-- PTXRegAlloc.cpp - PTX Register Allocator --------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file contains a register allocator for PTX code.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "ptx-reg-alloc"
|
|
|
|
#include "PTX.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/CodeGen/RegAllocRegistry.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
// Special register allocator for PTX.
|
|
class PTXRegAlloc : public MachineFunctionPass {
|
|
public:
|
|
static char ID;
|
|
PTXRegAlloc() : MachineFunctionPass(ID) {}
|
|
|
|
virtual const char* getPassName() const {
|
|
return "PTX Register Allocator";
|
|
}
|
|
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.setPreservesCFG();
|
|
MachineFunctionPass::getAnalysisUsage(AU);
|
|
}
|
|
|
|
virtual bool runOnMachineFunction(MachineFunction &MF) {
|
|
// We do not actually do anything (at least not yet).
|
|
return false;
|
|
}
|
|
};
|
|
|
|
char PTXRegAlloc::ID = 0;
|
|
|
|
static RegisterRegAlloc
|
|
ptxRegAlloc("ptx", "PTX register allocator", createPTXRegisterAllocator);
|
|
}
|
|
|
|
FunctionPass *llvm::createPTXRegisterAllocator() {
|
|
return new PTXRegAlloc();
|
|
}
|
|
|