2012-02-18 12:03:15 +00:00
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//===-- PowerPCSubtarget.cpp - PPC Subtarget Information ------------------===//
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2005-08-04 07:12:09 +00:00
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//
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// The LLVM Compiler Infrastructure
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//
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2007-12-29 20:36:04 +00:00
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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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2005-08-04 07:12:09 +00:00
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//
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//===----------------------------------------------------------------------===//
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//
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2011-07-01 21:01:15 +00:00
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// This file implements the PPC specific subclass of TargetSubtargetInfo.
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2005-08-04 07:12:09 +00:00
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//
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//===----------------------------------------------------------------------===//
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2005-10-14 23:51:18 +00:00
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#include "PPCSubtarget.h"
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2011-12-02 04:58:02 +00:00
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#include "PPCRegisterInfo.h"
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2005-10-14 23:51:18 +00:00
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#include "PPC.h"
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2009-08-02 22:11:08 +00:00
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#include "llvm/GlobalValue.h"
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2006-12-11 23:22:45 +00:00
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#include "llvm/Target/TargetMachine.h"
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2012-06-12 03:03:13 +00:00
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#include "llvm/Support/Host.h"
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2011-08-24 18:08:43 +00:00
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#include "llvm/Support/TargetRegistry.h"
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2009-01-05 17:59:02 +00:00
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#include <cstdlib>
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2011-07-01 20:45:01 +00:00
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#define GET_SUBTARGETINFO_TARGET_DESC
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2011-07-08 01:53:10 +00:00
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#define GET_SUBTARGETINFO_CTOR
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2011-07-01 22:36:09 +00:00
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#include "PPCGenSubtargetInfo.inc"
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2011-07-01 20:45:01 +00:00
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2005-08-05 22:05:03 +00:00
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using namespace llvm;
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2011-06-30 01:53:36 +00:00
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PPCSubtarget::PPCSubtarget(const std::string &TT, const std::string &CPU,
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const std::string &FS, bool is64Bit)
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2011-07-07 07:07:08 +00:00
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: PPCGenSubtargetInfo(TT, CPU, FS)
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2011-07-01 20:45:01 +00:00
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, StackAlignment(16)
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2008-02-14 23:35:16 +00:00
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, DarwinDirective(PPC::DIR_NONE)
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2012-06-11 19:57:01 +00:00
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, HasMFOCRF(false)
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2006-06-16 17:34:12 +00:00
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, Has64BitSupport(false)
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, Use64BitRegs(false)
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2006-06-16 17:50:12 +00:00
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, IsPPC64(is64Bit)
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2005-10-26 17:30:34 +00:00
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, HasAltivec(false)
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, HasFSQRT(false)
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2006-03-01 05:50:56 +00:00
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, HasSTFIWX(false)
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2012-06-22 23:10:08 +00:00
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, HasISEL(false)
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2011-10-17 04:03:49 +00:00
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, IsBookE(false)
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2008-01-02 19:35:16 +00:00
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, HasLazyResolverStubs(false)
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2010-08-04 20:47:44 +00:00
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, IsJITCodeModel(false)
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2011-04-19 20:54:28 +00:00
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, TargetTriple(TT) {
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2005-08-05 22:05:03 +00:00
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2005-09-01 21:38:21 +00:00
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// Determine default and user specified characteristics
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2011-06-30 01:53:36 +00:00
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std::string CPUName = CPU;
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if (CPUName.empty())
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CPUName = "generic";
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2012-06-12 03:03:13 +00:00
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#if (defined(__APPLE__) || defined(__linux__)) && \
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(defined(__ppc__) || defined(__powerpc__))
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2011-06-30 01:53:36 +00:00
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if (CPUName == "generic")
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2012-06-12 03:03:13 +00:00
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CPUName = sys::getHostCPUName();
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2005-09-01 21:38:21 +00:00
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#endif
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2005-10-26 17:30:34 +00:00
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// Parse features string.
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2011-07-07 07:07:08 +00:00
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ParseSubtargetFeatures(CPUName, FS);
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2005-09-01 21:38:21 +00:00
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2011-07-01 20:45:01 +00:00
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// Initialize scheduling itinerary for the specified CPU.
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InstrItins = getInstrItineraryForCPU(CPUName);
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2006-06-16 17:50:12 +00:00
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// If we are generating code for ppc64, verify that options make sense.
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if (is64Bit) {
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2008-02-15 18:40:53 +00:00
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Has64BitSupport = true;
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2006-06-16 20:05:06 +00:00
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// Silently force 64-bit register use on ppc64.
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Use64BitRegs = true;
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2006-06-16 17:50:12 +00:00
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}
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2012-10-04 16:20:24 +00:00
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2006-06-16 17:50:12 +00:00
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// If the user requested use of 64-bit regs, but the cpu selected doesn't
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2008-02-15 18:40:53 +00:00
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// support it, ignore.
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if (use64BitRegs() && !has64BitSupport())
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2006-06-16 17:50:12 +00:00
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Use64BitRegs = false;
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2006-12-11 23:22:45 +00:00
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// Set up darwin-specific properties.
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2009-08-11 22:49:34 +00:00
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if (isDarwin())
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2006-12-11 23:22:45 +00:00
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HasLazyResolverStubs = true;
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}
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/// SetJITMode - This is called to inform the subtarget info that we are
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/// producing code for the JIT.
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void PPCSubtarget::SetJITMode() {
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// JIT mode doesn't want lazy resolver stubs, it knows exactly where
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// everything is. This matters for PPC64, which codegens in PIC mode without
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// stubs.
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HasLazyResolverStubs = false;
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2010-08-04 20:47:44 +00:00
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// Calls to external functions need to use indirect calls
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IsJITCodeModel = true;
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2006-12-11 23:22:45 +00:00
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}
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/// hasLazyResolverStub - Return true if accesses to the specified global have
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/// to go through a dyld lazy resolution stub. This means that an extra load
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/// is required to get the address of the global.
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2009-08-02 22:11:08 +00:00
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bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV,
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const TargetMachine &TM) const {
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2010-11-15 02:46:57 +00:00
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// We never have stubs if HasLazyResolverStubs=false or if in static mode.
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2006-12-11 23:22:45 +00:00
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if (!HasLazyResolverStubs || TM.getRelocationModel() == Reloc::Static)
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return false;
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2008-12-05 01:06:39 +00:00
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// If symbol visibility is hidden, the extra load is not needed if
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// the symbol is definitely defined in the current translation unit.
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2010-01-27 20:34:15 +00:00
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bool isDecl = GV->isDeclaration() && !GV->isMaterializable();
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2008-12-05 01:06:39 +00:00
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if (GV->hasHiddenVisibility() && !isDecl && !GV->hasCommonLinkage())
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return false;
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2006-12-11 23:22:45 +00:00
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return GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
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2008-12-05 01:06:39 +00:00
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GV->hasCommonLinkage() || isDecl;
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2005-08-04 07:12:09 +00:00
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}
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2011-12-02 04:58:02 +00:00
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bool PPCSubtarget::enablePostRAScheduler(
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CodeGenOpt::Level OptLevel,
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TargetSubtargetInfo::AntiDepBreakMode& Mode,
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RegClassVector& CriticalPathRCs) const {
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2012-06-10 11:15:36 +00:00
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// FIXME: It would be best to use TargetSubtargetInfo::ANTIDEP_ALL here,
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// but we can't because we can't reassign the cr registers. There is a
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// dependence between the cr register and the RLWINM instruction used
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// to extract its value which the anti-dependency breaker can't currently
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// see. Maybe we should make a late-expanded pseudo to encode this dependency.
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// (the relevant code is in PPCDAGToDAGISel::SelectSETCC)
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Mode = TargetSubtargetInfo::ANTIDEP_CRITICAL;
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2011-12-02 04:58:02 +00:00
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CriticalPathRCs.clear();
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if (isPPC64())
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CriticalPathRCs.push_back(&PPC::G8RCRegClass);
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else
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CriticalPathRCs.push_back(&PPC::GPRCRegClass);
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2012-06-10 11:15:36 +00:00
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CriticalPathRCs.push_back(&PPC::F8RCRegClass);
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CriticalPathRCs.push_back(&PPC::VRRCRegClass);
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2011-12-02 04:58:02 +00:00
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return OptLevel >= CodeGenOpt::Default;
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}
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