-//===- PowerPCSubtarget.cpp - PPC Subtarget Information ---------*- C++ -*-===//
+//===- PowerPCSubtarget.cpp - PPC Subtarget Information -------------------===//
//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Nate Begeman and is distributed under the
-// University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#include "PPCSubtarget.h"
#include "PPC.h"
-#include "llvm/Module.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Target/SubtargetFeature.h"
-
+#include "llvm/GlobalValue.h"
+#include "llvm/Target/TargetMachine.h"
+#include "PPCGenSubtarget.inc"
+#include <cstdlib>
using namespace llvm;
-PPCTargetEnum llvm::PPCTarget = TargetDefault;
-
-namespace llvm {
- cl::opt<PPCTargetEnum, true>
- PPCTargetArg(cl::desc("Force generation of code for a specific PPC target:"),
- cl::values(
- clEnumValN(TargetAIX, "aix", " Enable AIX codegen"),
- clEnumValN(TargetDarwin,"darwin",
- " Enable Darwin codegen"),
- clEnumValEnd),
- cl::location(PPCTarget), cl::init(TargetDefault));
-}
-
-enum PowerPCFeature {
- PowerPCFeature64Bit = 1 << 0,
- PowerPCFeatureAltivec = 1 << 1,
- PowerPCFeatureFSqrt = 1 << 2,
- PowerPCFeatureGPUL = 1 << 3,
-};
-
-/// Sorted (by key) array of values for CPU subtype.
-static const SubtargetFeatureKV PowerPCSubTypeKV[] = {
- { "601" , "Select the PowerPC 601 processor", 0 },
- { "602" , "Select the PowerPC 602 processor", 0 },
- { "603" , "Select the PowerPC 603 processor", 0 },
- { "603e" , "Select the PowerPC 603e processor", 0 },
- { "603ev" , "Select the PowerPC 603ev processor", 0 },
- { "604" , "Select the PowerPC 604 processor", 0 },
- { "604e" , "Select the PowerPC 604e processor", 0 },
- { "620" , "Select the PowerPC 620 processor", 0 },
- { "7400" , "Select the PowerPC 7400 (G4) processor",
- PowerPCFeatureAltivec },
- { "7450" , "Select the PowerPC 7450 (G4+) processor",
- PowerPCFeatureAltivec },
- { "750" , "Select the PowerPC 750 (G3) processor", 0 },
- { "970" , "Select the PowerPC 970 (G5 - GPUL) processor",
- PowerPCFeature64Bit | PowerPCFeatureAltivec |
- PowerPCFeatureFSqrt | PowerPCFeatureGPUL },
- { "g3" , "Select the PowerPC G3 (750) processor", 0 },
- { "g4" , "Select the PowerPC G4 (7400) processor",
- PowerPCFeatureAltivec },
- { "g4+" , "Select the PowerPC G4+ (7450) processor",
- PowerPCFeatureAltivec },
- { "g5" , "Select the PowerPC g5 (970 - GPUL) processor",
- PowerPCFeature64Bit | PowerPCFeatureAltivec |
- PowerPCFeatureFSqrt | PowerPCFeatureGPUL },
- { "generic", "Select instructions for a generic PowerPC processor", 0 }
-};
-/// Length of PowerPCSubTypeKV.
-static const unsigned PowerPCSubTypeKVSize = sizeof(PowerPCSubTypeKV)
- / sizeof(SubtargetFeatureKV);
-
-/// Sorted (by key) array of values for CPU features.
-static SubtargetFeatureKV PowerPCFeatureKV[] = {
- { "64bit" , "Should 64 bit instructions be used" , PowerPCFeature64Bit },
- { "altivec", "Should Altivec instructions be used" , PowerPCFeatureAltivec },
- { "fsqrt" , "Should the fsqrt instruction be used", PowerPCFeatureFSqrt },
- { "gpul" , "Should GPUL instructions be used" , PowerPCFeatureGPUL }
- };
-/// Length of PowerPCFeatureKV.
-static const unsigned PowerPCFeatureKVSize = sizeof(PowerPCFeatureKV)
- / sizeof(SubtargetFeatureKV);
-
#if defined(__APPLE__)
#include <mach/mach.h>
}
#endif
-PPCSubtarget::PPCSubtarget(const Module &M, const std::string &FS)
- : StackAlignment(16), IsGigaProcessor(false), IsAIX(false), IsDarwin(false) {
+
+PPCSubtarget::PPCSubtarget(const std::string &TT, const std::string &FS,
+ bool is64Bit)
+ : StackAlignment(16)
+ , DarwinDirective(PPC::DIR_NONE)
+ , IsGigaProcessor(false)
+ , Has64BitSupport(false)
+ , Use64BitRegs(false)
+ , IsPPC64(is64Bit)
+ , HasAltivec(false)
+ , HasFSQRT(false)
+ , HasSTFIWX(false)
+ , HasLazyResolverStubs(false)
+ , DarwinVers(0) {
// Determine default and user specified characteristics
std::string CPU = "generic";
#if defined(__APPLE__)
CPU = GetCurrentPowerPCCPU();
#endif
- uint32_t Bits =
- SubtargetFeatures::Parse(FS, CPU,
- PowerPCSubTypeKV, PowerPCSubTypeKVSize,
- PowerPCFeatureKV, PowerPCFeatureKVSize);
- IsGigaProcessor = (Bits & PowerPCFeatureGPUL ) != 0;
- Is64Bit = (Bits & PowerPCFeature64Bit) != 0;
- HasFSQRT = (Bits & PowerPCFeatureFSqrt) != 0;
+ // Parse features string.
+ ParseSubtargetFeatures(FS, CPU);
+
+ // If we are generating code for ppc64, verify that options make sense.
+ if (is64Bit) {
+ Has64BitSupport = true;
+ // Silently force 64-bit register use on ppc64.
+ Use64BitRegs = true;
+ }
+
+ // If the user requested use of 64-bit regs, but the cpu selected doesn't
+ // support it, ignore.
+ if (use64BitRegs() && !has64BitSupport())
+ Use64BitRegs = false;
+
// Set the boolean corresponding to the current target triple, or the default
// if one cannot be determined, to true.
- const std::string& TT = M.getTargetTriple();
- if (TT.length() > 5) {
- IsDarwin = TT.find("darwin") != std::string::npos;
- } else if (TT.empty()) {
-#if defined(_POWER)
- IsAIX = true;
-#elif defined(__APPLE__)
- IsDarwin = true;
-#endif
+ if (TT.length() > 7) {
+ // Determine which version of darwin this is.
+ size_t DarwinPos = TT.find("-darwin");
+ if (DarwinPos != std::string::npos) {
+ if (isdigit(TT[DarwinPos+7]))
+ DarwinVers = atoi(&TT[DarwinPos+7]);
+ else
+ DarwinVers = 8; // Minimum supported darwin is Tiger.
+ }
}
+
+ // Set up darwin-specific properties.
+ if (isDarwin())
+ HasLazyResolverStubs = true;
+}
+
+/// SetJITMode - This is called to inform the subtarget info that we are
+/// producing code for the JIT.
+void PPCSubtarget::SetJITMode() {
+ // JIT mode doesn't want lazy resolver stubs, it knows exactly where
+ // everything is. This matters for PPC64, which codegens in PIC mode without
+ // stubs.
+ HasLazyResolverStubs = false;
+}
+
+
+/// hasLazyResolverStub - Return true if accesses to the specified global have
+/// to go through a dyld lazy resolution stub. This means that an extra load
+/// is required to get the address of the global.
+bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV,
+ const TargetMachine &TM) const {
+ // We never hae stubs if HasLazyResolverStubs=false or if in static mode.
+ if (!HasLazyResolverStubs || TM.getRelocationModel() == Reloc::Static)
+ return false;
+ // If symbol visibility is hidden, the extra load is not needed if
+ // the symbol is definitely defined in the current translation unit.
+ bool isDecl = GV->isDeclaration() && !GV->isMaterializable();
+ if (GV->hasHiddenVisibility() && !isDecl && !GV->hasCommonLinkage())
+ return false;
+ return GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
+ GV->hasCommonLinkage() || isDecl;
}
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