1 //===- MBlazeSubtarget.cpp - MBlaze Subtarget Information -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the MBlaze specific subclass of TargetSubtarget.
12 //===----------------------------------------------------------------------===//
14 #include "MBlazeSubtarget.h"
16 #include "MBlazeRegisterInfo.h"
17 #include "MBlazeGenSubtarget.inc"
18 #include "llvm/Support/CommandLine.h"
21 MBlazeSubtarget::MBlazeSubtarget(const std::string &TT, const std::string &FS):
22 HasBarrel(false), HasDiv(false), HasMul(false), HasPatCmp(false),
23 HasFPU(false), HasMul64(false), HasSqrt(false)
25 // Parse features string.
26 std::string CPU = "mblaze";
27 CPU = ParseSubtargetFeatures(FS, CPU);
29 // Only use instruction scheduling if the selected CPU has an instruction
30 // itinerary (the default CPU is the only one that doesn't).
31 HasItin = CPU != "mblaze";
32 DEBUG(dbgs() << "CPU " << CPU << "(" << HasItin << ")\n");
34 // Compute the issue width of the MBlaze itineraries
38 void MBlazeSubtarget::computeIssueWidth() {
39 InstrItins.IssueWidth = 1;
42 bool MBlazeSubtarget::
43 enablePostRAScheduler(CodeGenOpt::Level OptLevel,
44 TargetSubtarget::AntiDepBreakMode& Mode,
45 RegClassVector& CriticalPathRCs) const {
46 Mode = TargetSubtarget::ANTIDEP_CRITICAL;
47 CriticalPathRCs.clear();
48 CriticalPathRCs.push_back(&MBlaze::GPRRegClass);
49 return HasItin && OptLevel >= CodeGenOpt::Default;