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034261674b
be the first encoded as the first feature. It then uses the CPU name to look up features / scheduling itineray even though clients know full well the CPU name being used to query these properties. The fix is to just have the clients explictly pass the CPU name! llvm-svn: 134127
353 lines
12 KiB
C++
353 lines
12 KiB
C++
//===-- X86Subtarget.cpp - X86 Subtarget Information ----------------------===//
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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 X86 specific subclass of TargetSubtarget.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "subtarget"
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#include "X86Subtarget.h"
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#include "X86InstrInfo.h"
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#include "X86GenSubtarget.inc"
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#include "llvm/GlobalValue.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/ADT/SmallVector.h"
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using namespace llvm;
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#if defined(_MSC_VER)
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#include <intrin.h>
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#endif
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/// ClassifyBlockAddressReference - Classify a blockaddress reference for the
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/// current subtarget according to how we should reference it in a non-pcrel
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/// context.
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unsigned char X86Subtarget::
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ClassifyBlockAddressReference() const {
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if (isPICStyleGOT()) // 32-bit ELF targets.
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return X86II::MO_GOTOFF;
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if (isPICStyleStubPIC()) // Darwin/32 in PIC mode.
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return X86II::MO_PIC_BASE_OFFSET;
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// Direct static reference to label.
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return X86II::MO_NO_FLAG;
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}
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/// ClassifyGlobalReference - Classify a global variable reference for the
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/// current subtarget according to how we should reference it in a non-pcrel
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/// context.
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unsigned char X86Subtarget::
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ClassifyGlobalReference(const GlobalValue *GV, const TargetMachine &TM) const {
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// DLLImport only exists on windows, it is implemented as a load from a
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// DLLIMPORT stub.
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if (GV->hasDLLImportLinkage())
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return X86II::MO_DLLIMPORT;
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// Determine whether this is a reference to a definition or a declaration.
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// Materializable GVs (in JIT lazy compilation mode) do not require an extra
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// load from stub.
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bool isDecl = GV->hasAvailableExternallyLinkage();
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if (GV->isDeclaration() && !GV->isMaterializable())
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isDecl = true;
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// X86-64 in PIC mode.
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if (isPICStyleRIPRel()) {
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// Large model never uses stubs.
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if (TM.getCodeModel() == CodeModel::Large)
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return X86II::MO_NO_FLAG;
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if (isTargetDarwin()) {
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// If symbol visibility is hidden, the extra load is not needed if
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// target is x86-64 or the symbol is definitely defined in the current
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// translation unit.
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if (GV->hasDefaultVisibility() &&
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(isDecl || GV->isWeakForLinker()))
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return X86II::MO_GOTPCREL;
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} else if (!isTargetWin64()) {
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assert(isTargetELF() && "Unknown rip-relative target");
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// Extra load is needed for all externally visible.
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if (!GV->hasLocalLinkage() && GV->hasDefaultVisibility())
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return X86II::MO_GOTPCREL;
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}
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return X86II::MO_NO_FLAG;
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}
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if (isPICStyleGOT()) { // 32-bit ELF targets.
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// Extra load is needed for all externally visible.
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if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
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return X86II::MO_GOTOFF;
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return X86II::MO_GOT;
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}
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if (isPICStyleStubPIC()) { // Darwin/32 in PIC mode.
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// Determine whether we have a stub reference and/or whether the reference
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// is relative to the PIC base or not.
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// If this is a strong reference to a definition, it is definitely not
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// through a stub.
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if (!isDecl && !GV->isWeakForLinker())
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return X86II::MO_PIC_BASE_OFFSET;
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// Unless we have a symbol with hidden visibility, we have to go through a
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// normal $non_lazy_ptr stub because this symbol might be resolved late.
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if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference.
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return X86II::MO_DARWIN_NONLAZY_PIC_BASE;
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// If symbol visibility is hidden, we have a stub for common symbol
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// references and external declarations.
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if (isDecl || GV->hasCommonLinkage()) {
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// Hidden $non_lazy_ptr reference.
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return X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE;
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}
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// Otherwise, no stub.
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return X86II::MO_PIC_BASE_OFFSET;
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}
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if (isPICStyleStubNoDynamic()) { // Darwin/32 in -mdynamic-no-pic mode.
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// Determine whether we have a stub reference.
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// If this is a strong reference to a definition, it is definitely not
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// through a stub.
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if (!isDecl && !GV->isWeakForLinker())
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return X86II::MO_NO_FLAG;
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// Unless we have a symbol with hidden visibility, we have to go through a
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// normal $non_lazy_ptr stub because this symbol might be resolved late.
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if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference.
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return X86II::MO_DARWIN_NONLAZY;
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// Otherwise, no stub.
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return X86II::MO_NO_FLAG;
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}
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// Direct static reference to global.
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return X86II::MO_NO_FLAG;
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}
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/// getBZeroEntry - This function returns the name of a function which has an
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/// interface like the non-standard bzero function, if such a function exists on
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/// the current subtarget and it is considered prefereable over memset with zero
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/// passed as the second argument. Otherwise it returns null.
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const char *X86Subtarget::getBZeroEntry() const {
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// Darwin 10 has a __bzero entry point for this purpose.
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if (getTargetTriple().isMacOSX() &&
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!getTargetTriple().isMacOSXVersionLT(10, 6))
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return "__bzero";
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return 0;
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}
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/// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
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/// to immediate address.
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bool X86Subtarget::IsLegalToCallImmediateAddr(const TargetMachine &TM) const {
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if (Is64Bit)
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return false;
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return isTargetELF() || TM.getRelocationModel() == Reloc::Static;
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}
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/// getSpecialAddressLatency - For targets where it is beneficial to
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/// backschedule instructions that compute addresses, return a value
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/// indicating the number of scheduling cycles of backscheduling that
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/// should be attempted.
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unsigned X86Subtarget::getSpecialAddressLatency() const {
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// For x86 out-of-order targets, back-schedule address computations so
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// that loads and stores aren't blocked.
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// This value was chosen arbitrarily.
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return 200;
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}
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/// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in the
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/// specified arguments. If we can't run cpuid on the host, return true.
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static bool GetCpuIDAndInfo(unsigned value, unsigned *rEAX,
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unsigned *rEBX, unsigned *rECX, unsigned *rEDX) {
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#if defined(__x86_64__) || defined(_M_AMD64) || defined (_M_X64)
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#if defined(__GNUC__)
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// gcc doesn't know cpuid would clobber ebx/rbx. Preseve it manually.
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asm ("movq\t%%rbx, %%rsi\n\t"
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"cpuid\n\t"
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"xchgq\t%%rbx, %%rsi\n\t"
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: "=a" (*rEAX),
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"=S" (*rEBX),
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"=c" (*rECX),
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"=d" (*rEDX)
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: "a" (value));
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return false;
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#elif defined(_MSC_VER)
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int registers[4];
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__cpuid(registers, value);
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*rEAX = registers[0];
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*rEBX = registers[1];
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*rECX = registers[2];
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*rEDX = registers[3];
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return false;
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#endif
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#elif defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
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#if defined(__GNUC__)
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asm ("movl\t%%ebx, %%esi\n\t"
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"cpuid\n\t"
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"xchgl\t%%ebx, %%esi\n\t"
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: "=a" (*rEAX),
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"=S" (*rEBX),
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"=c" (*rECX),
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"=d" (*rEDX)
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: "a" (value));
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return false;
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#elif defined(_MSC_VER)
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__asm {
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mov eax,value
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cpuid
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mov esi,rEAX
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mov dword ptr [esi],eax
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mov esi,rEBX
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mov dword ptr [esi],ebx
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mov esi,rECX
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mov dword ptr [esi],ecx
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mov esi,rEDX
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mov dword ptr [esi],edx
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}
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return false;
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#endif
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#endif
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return true;
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}
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static void DetectFamilyModel(unsigned EAX, unsigned &Family, unsigned &Model) {
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Family = (EAX >> 8) & 0xf; // Bits 8 - 11
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Model = (EAX >> 4) & 0xf; // Bits 4 - 7
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if (Family == 6 || Family == 0xf) {
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if (Family == 0xf)
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// Examine extended family ID if family ID is F.
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Family += (EAX >> 20) & 0xff; // Bits 20 - 27
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// Examine extended model ID if family ID is 6 or F.
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Model += ((EAX >> 16) & 0xf) << 4; // Bits 16 - 19
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}
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}
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void X86Subtarget::AutoDetectSubtargetFeatures() {
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unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
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union {
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unsigned u[3];
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char c[12];
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} text;
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if (GetCpuIDAndInfo(0, &EAX, text.u+0, text.u+2, text.u+1))
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return;
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GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX);
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if ((EDX >> 15) & 1) HasCMov = true;
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if ((EDX >> 23) & 1) X86SSELevel = MMX;
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if ((EDX >> 25) & 1) X86SSELevel = SSE1;
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if ((EDX >> 26) & 1) X86SSELevel = SSE2;
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if (ECX & 0x1) X86SSELevel = SSE3;
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if ((ECX >> 9) & 1) X86SSELevel = SSSE3;
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if ((ECX >> 19) & 1) X86SSELevel = SSE41;
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if ((ECX >> 20) & 1) X86SSELevel = SSE42;
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// FIXME: AVX codegen support is not ready.
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//if ((ECX >> 28) & 1) { HasAVX = true; X86SSELevel = NoMMXSSE; }
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bool IsIntel = memcmp(text.c, "GenuineIntel", 12) == 0;
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bool IsAMD = !IsIntel && memcmp(text.c, "AuthenticAMD", 12) == 0;
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HasCLMUL = IsIntel && ((ECX >> 1) & 0x1);
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HasFMA3 = IsIntel && ((ECX >> 12) & 0x1);
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HasPOPCNT = IsIntel && ((ECX >> 23) & 0x1);
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HasAES = IsIntel && ((ECX >> 25) & 0x1);
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if (IsIntel || IsAMD) {
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// Determine if bit test memory instructions are slow.
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unsigned Family = 0;
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unsigned Model = 0;
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DetectFamilyModel(EAX, Family, Model);
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IsBTMemSlow = IsAMD || (Family == 6 && Model >= 13);
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// If it's Nehalem, unaligned memory access is fast.
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if (Family == 15 && Model == 26)
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IsUAMemFast = true;
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GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
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HasX86_64 = (EDX >> 29) & 0x1;
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HasSSE4A = IsAMD && ((ECX >> 6) & 0x1);
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HasFMA4 = IsAMD && ((ECX >> 16) & 0x1);
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}
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}
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X86Subtarget::X86Subtarget(const std::string &TT, const std::string &CPU,
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const std::string &FS,
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bool is64Bit, unsigned StackAlignOverride)
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: PICStyle(PICStyles::None)
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, X86SSELevel(NoMMXSSE)
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, X863DNowLevel(NoThreeDNow)
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, HasCMov(false)
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, HasX86_64(false)
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, HasPOPCNT(false)
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, HasSSE4A(false)
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, HasAVX(false)
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, HasAES(false)
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, HasCLMUL(false)
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, HasFMA3(false)
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, HasFMA4(false)
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, IsBTMemSlow(false)
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, IsUAMemFast(false)
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, HasVectorUAMem(false)
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, stackAlignment(8)
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// FIXME: this is a known good value for Yonah. How about others?
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, MaxInlineSizeThreshold(128)
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, TargetTriple(TT)
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, Is64Bit(is64Bit) {
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// Determine default and user specified characteristics
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if (!CPU.empty() || !FS.empty()) {
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// If feature string is not empty, parse features string.
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std::string CPUName = CPU;
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if (CPUName.empty())
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CPUName = sys::getHostCPUName();
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ParseSubtargetFeatures(FS, CPUName);
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// All X86-64 CPUs also have SSE2, however user might request no SSE via
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// -mattr, so don't force SSELevel here.
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if (HasAVX)
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X86SSELevel = NoMMXSSE;
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} else {
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// Otherwise, use CPUID to auto-detect feature set.
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AutoDetectSubtargetFeatures();
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// Make sure SSE2 is enabled; it is available on all X86-64 CPUs.
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if (Is64Bit && !HasAVX && X86SSELevel < SSE2)
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X86SSELevel = SSE2;
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}
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// If requesting codegen for X86-64, make sure that 64-bit features
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// are enabled.
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if (Is64Bit) {
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HasX86_64 = true;
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// All 64-bit cpus have cmov support.
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HasCMov = true;
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}
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DEBUG(dbgs() << "Subtarget features: SSELevel " << X86SSELevel
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<< ", 3DNowLevel " << X863DNowLevel
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<< ", 64bit " << HasX86_64 << "\n");
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assert((!Is64Bit || HasX86_64) &&
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"64-bit code requested on a subtarget that doesn't support it!");
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// Stack alignment is 16 bytes on Darwin, FreeBSD, Linux and Solaris (both
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// 32 and 64 bit) and for all 64-bit targets.
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if (StackAlignOverride)
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stackAlignment = StackAlignOverride;
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else if (isTargetDarwin() || isTargetFreeBSD() || isTargetLinux() ||
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isTargetSolaris() || Is64Bit)
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stackAlignment = 16;
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}
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