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52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
//===- MBlazeSubtarget.cpp - MBlaze Subtarget Information -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the MBlaze specific subclass of TargetSubtarget.
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//
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//===----------------------------------------------------------------------===//
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#include "MBlazeSubtarget.h"
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#include "MBlaze.h"
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#include "MBlazeRegisterInfo.h"
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#include "MBlazeGenSubtarget.inc"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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MBlazeSubtarget::MBlazeSubtarget(const std::string &TT, const std::string &FS):
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HasBarrel(false), HasDiv(false), HasMul(false), HasPatCmp(false),
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HasFPU(false), HasMul64(false), HasSqrt(false)
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{
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// Parse features string.
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std::string CPU = "mblaze";
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CPU = ParseSubtargetFeatures(FS, CPU);
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// Only use instruction scheduling if the selected CPU has an instruction
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// itinerary (the default CPU is the only one that doesn't).
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HasItin = CPU != "mblaze";
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DEBUG(dbgs() << "CPU " << CPU << "(" << HasItin << ")\n");
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// Compute the issue width of the MBlaze itineraries
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computeIssueWidth();
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}
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void MBlazeSubtarget::computeIssueWidth() {
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InstrItins.IssueWidth = 1;
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}
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bool MBlazeSubtarget::
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enablePostRAScheduler(CodeGenOpt::Level OptLevel,
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TargetSubtarget::AntiDepBreakMode& Mode,
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RegClassVector& CriticalPathRCs) const {
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Mode = TargetSubtarget::ANTIDEP_CRITICAL;
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CriticalPathRCs.clear();
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CriticalPathRCs.push_back(&MBlaze::GPRRegClass);
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return HasItin && OptLevel >= CodeGenOpt::Default;
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}
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