AMDGPU.cpp

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//===--- AMDGPU.cpp - Implement AMDGPU target feature support -------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements AMDGPU TargetInfo objects.
//
//===----------------------------------------------------------------------===//
 
#include "AMDGPU.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/MacroBuilder.h"
#include "clang/Basic/TargetBuiltins.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/TargetParser/AMDGPUTargetParser.h"
using namespace clang;
using namespace clang::targets;
 
namespace clang {
namespace targets {
 
// If you edit the description strings, make sure you update
// getPointerWidthV().
 
const LangASMap AMDGPUTargetInfo::AMDGPUAddrSpaceMap = {
    {LangAS::Default, llvm::AMDGPUAS::FLAT_ADDRESS},
    {LangAS::opencl_global, llvm::AMDGPUAS::GLOBAL_ADDRESS},
    {LangAS::opencl_local, llvm::AMDGPUAS::LOCAL_ADDRESS},
    {LangAS::opencl_constant, llvm::AMDGPUAS::CONSTANT_ADDRESS},
    {LangAS::opencl_private, llvm::AMDGPUAS::PRIVATE_ADDRESS},
    {LangAS::opencl_generic, llvm::AMDGPUAS::FLAT_ADDRESS},
    {LangAS::opencl_global_device, llvm::AMDGPUAS::GLOBAL_ADDRESS},
    {LangAS::opencl_global_host, llvm::AMDGPUAS::GLOBAL_ADDRESS},
    {LangAS::cuda_device, llvm::AMDGPUAS::GLOBAL_ADDRESS},
    {LangAS::cuda_constant, llvm::AMDGPUAS::CONSTANT_ADDRESS},
    {LangAS::cuda_shared, llvm::AMDGPUAS::LOCAL_ADDRESS},
    {LangAS::sycl_global, llvm::AMDGPUAS::GLOBAL_ADDRESS},
    {LangAS::sycl_global_device, llvm::AMDGPUAS::GLOBAL_ADDRESS},
    {LangAS::sycl_global_host, llvm::AMDGPUAS::GLOBAL_ADDRESS},
    {LangAS::sycl_local, llvm::AMDGPUAS::LOCAL_ADDRESS},
    {LangAS::sycl_private, llvm::AMDGPUAS::PRIVATE_ADDRESS},
    {LangAS::ptr32_sptr, llvm::AMDGPUAS::FLAT_ADDRESS},
    {LangAS::ptr32_uptr, llvm::AMDGPUAS::FLAT_ADDRESS},
    {LangAS::ptr64, llvm::AMDGPUAS::FLAT_ADDRESS},
    {LangAS::hlsl_groupshared, llvm::AMDGPUAS::FLAT_ADDRESS},
    {LangAS::hlsl_constant, llvm::AMDGPUAS::CONSTANT_ADDRESS},
    // FIXME(pr/122103): hlsl_private -> PRIVATE is wrong, but at least this
    // will break loudly.
    {LangAS::hlsl_private, llvm::AMDGPUAS::PRIVATE_ADDRESS},
    {LangAS::hlsl_device, llvm::AMDGPUAS::GLOBAL_ADDRESS},
    {LangAS::hlsl_input, llvm::AMDGPUAS::PRIVATE_ADDRESS},
    {LangAS::hlsl_output, llvm::AMDGPUAS::PRIVATE_ADDRESS},
    {LangAS::hlsl_push_constant, llvm::AMDGPUAS::GLOBAL_ADDRESS},
    {LangAS::amdgpu_barrier, llvm::AMDGPUAS::LOCAL_ADDRESS},
};
 
} // namespace targets
} // namespace clang
 
static constexpr int NumBuiltins =
    clang::AMDGPU::LastTSBuiltin - Builtin::FirstTSBuiltin;
 
#define GET_BUILTIN_STR_TABLE
#include "clang/Basic/BuiltinsAMDGPU.inc"
#undef GET_BUILTIN_STR_TABLE
 
static constexpr Builtin::Info BuiltinInfos[] = {
#define GET_BUILTIN_INFOS
#include "clang/Basic/BuiltinsAMDGPU.inc"
#undef GET_BUILTIN_INFOS
};
static_assert(std::size(BuiltinInfos) == NumBuiltins);
 
const char *const AMDGPUTargetInfo::GCCRegNames[] = {
  "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8",
  "v9", "v10", "v11", "v12", "v13", "v14", "v15", "v16", "v17",
  "v18", "v19", "v20", "v21", "v22", "v23", "v24", "v25", "v26",
  "v27", "v28", "v29", "v30", "v31", "v32", "v33", "v34", "v35",
  "v36", "v37", "v38", "v39", "v40", "v41", "v42", "v43", "v44",
  "v45", "v46", "v47", "v48", "v49", "v50", "v51", "v52", "v53",
  "v54", "v55", "v56", "v57", "v58", "v59", "v60", "v61", "v62",
  "v63", "v64", "v65", "v66", "v67", "v68", "v69", "v70", "v71",
  "v72", "v73", "v74", "v75", "v76", "v77", "v78", "v79", "v80",
  "v81", "v82", "v83", "v84", "v85", "v86", "v87", "v88", "v89",
  "v90", "v91", "v92", "v93", "v94", "v95", "v96", "v97", "v98",
  "v99", "v100", "v101", "v102", "v103", "v104", "v105", "v106", "v107",
  "v108", "v109", "v110", "v111", "v112", "v113", "v114", "v115", "v116",
  "v117", "v118", "v119", "v120", "v121", "v122", "v123", "v124", "v125",
  "v126", "v127", "v128", "v129", "v130", "v131", "v132", "v133", "v134",
  "v135", "v136", "v137", "v138", "v139", "v140", "v141", "v142", "v143",
  "v144", "v145", "v146", "v147", "v148", "v149", "v150", "v151", "v152",
  "v153", "v154", "v155", "v156", "v157", "v158", "v159", "v160", "v161",
  "v162", "v163", "v164", "v165", "v166", "v167", "v168", "v169", "v170",
  "v171", "v172", "v173", "v174", "v175", "v176", "v177", "v178", "v179",
  "v180", "v181", "v182", "v183", "v184", "v185", "v186", "v187", "v188",
  "v189", "v190", "v191", "v192", "v193", "v194", "v195", "v196", "v197",
  "v198", "v199", "v200", "v201", "v202", "v203", "v204", "v205", "v206",
  "v207", "v208", "v209", "v210", "v211", "v212", "v213", "v214", "v215",
  "v216", "v217", "v218", "v219", "v220", "v221", "v222", "v223", "v224",
  "v225", "v226", "v227", "v228", "v229", "v230", "v231", "v232", "v233",
  "v234", "v235", "v236", "v237", "v238", "v239", "v240", "v241", "v242",
  "v243", "v244", "v245", "v246", "v247", "v248", "v249", "v250", "v251",
  "v252", "v253", "v254", "v255", "s0", "s1", "s2", "s3", "s4",
  "s5", "s6", "s7", "s8", "s9", "s10", "s11", "s12", "s13",
  "s14", "s15", "s16", "s17", "s18", "s19", "s20", "s21", "s22",
  "s23", "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31",
  "s32", "s33", "s34", "s35", "s36", "s37", "s38", "s39", "s40",
  "s41", "s42", "s43", "s44", "s45", "s46", "s47", "s48", "s49",
  "s50", "s51", "s52", "s53", "s54", "s55", "s56", "s57", "s58",
  "s59", "s60", "s61", "s62", "s63", "s64", "s65", "s66", "s67",
  "s68", "s69", "s70", "s71", "s72", "s73", "s74", "s75", "s76",
  "s77", "s78", "s79", "s80", "s81", "s82", "s83", "s84", "s85",
  "s86", "s87", "s88", "s89", "s90", "s91", "s92", "s93", "s94",
  "s95", "s96", "s97", "s98", "s99", "s100", "s101", "s102", "s103",
  "s104", "s105", "s106", "s107", "s108", "s109", "s110", "s111", "s112",
  "s113", "s114", "s115", "s116", "s117", "s118", "s119", "s120", "s121",
  "s122", "s123", "s124", "s125", "s126", "s127", "exec", "vcc", "scc",
  "m0", "flat_scratch", "exec_lo", "exec_hi", "vcc_lo", "vcc_hi",
  "flat_scratch_lo", "flat_scratch_hi",
  "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8",
  "a9", "a10", "a11", "a12", "a13", "a14", "a15", "a16", "a17",
  "a18", "a19", "a20", "a21", "a22", "a23", "a24", "a25", "a26",
  "a27", "a28", "a29", "a30", "a31", "a32", "a33", "a34", "a35",
  "a36", "a37", "a38", "a39", "a40", "a41", "a42", "a43", "a44",
  "a45", "a46", "a47", "a48", "a49", "a50", "a51", "a52", "a53",
  "a54", "a55", "a56", "a57", "a58", "a59", "a60", "a61", "a62",
  "a63", "a64", "a65", "a66", "a67", "a68", "a69", "a70", "a71",
  "a72", "a73", "a74", "a75", "a76", "a77", "a78", "a79", "a80",
  "a81", "a82", "a83", "a84", "a85", "a86", "a87", "a88", "a89",
  "a90", "a91", "a92", "a93", "a94", "a95", "a96", "a97", "a98",
  "a99", "a100", "a101", "a102", "a103", "a104", "a105", "a106", "a107",
  "a108", "a109", "a110", "a111", "a112", "a113", "a114", "a115", "a116",
  "a117", "a118", "a119", "a120", "a121", "a122", "a123", "a124", "a125",
  "a126", "a127", "a128", "a129", "a130", "a131", "a132", "a133", "a134",
  "a135", "a136", "a137", "a138", "a139", "a140", "a141", "a142", "a143",
  "a144", "a145", "a146", "a147", "a148", "a149", "a150", "a151", "a152",
  "a153", "a154", "a155", "a156", "a157", "a158", "a159", "a160", "a161",
  "a162", "a163", "a164", "a165", "a166", "a167", "a168", "a169", "a170",
  "a171", "a172", "a173", "a174", "a175", "a176", "a177", "a178", "a179",
  "a180", "a181", "a182", "a183", "a184", "a185", "a186", "a187", "a188",
  "a189", "a190", "a191", "a192", "a193", "a194", "a195", "a196", "a197",
  "a198", "a199", "a200", "a201", "a202", "a203", "a204", "a205", "a206",
  "a207", "a208", "a209", "a210", "a211", "a212", "a213", "a214", "a215",
  "a216", "a217", "a218", "a219", "a220", "a221", "a222", "a223", "a224",
  "a225", "a226", "a227", "a228", "a229", "a230", "a231", "a232", "a233",
  "a234", "a235", "a236", "a237", "a238", "a239", "a240", "a241", "a242",
  "a243", "a244", "a245", "a246", "a247", "a248", "a249", "a250", "a251",
  "a252", "a253", "a254", "a255"
};
 
ArrayRef<const char *> AMDGPUTargetInfo::getGCCRegNames() const {
  return llvm::ArrayRef(GCCRegNames);
}
 
bool AMDGPUTargetInfo::initFeatureMap(
    llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU,
    const std::vector<std::string> &FeatureVec) const {
 
  using namespace llvm::AMDGPU;
 
  if (!TargetInfo::initFeatureMap(Features, Diags, CPU, FeatureVec))
    return false;
 
  auto HasError = fillAMDGPUFeatureMap(CPU, getTriple(), Features);
  switch (HasError.first) {
  default:
    break;
  case llvm::AMDGPU::INVALID_FEATURE_COMBINATION:
    Diags.Report(diag::err_invalid_feature_combination) << HasError.second;
    return false;
  case llvm::AMDGPU::UNSUPPORTED_TARGET_FEATURE:
    Diags.Report(diag::err_opt_not_valid_on_target) << HasError.second;
    return false;
  }
 
  return true;
}
 
void AMDGPUTargetInfo::fillValidCPUList(
    SmallVectorImpl<StringRef> &Values) const {
  if (getTriple().isAMDGCN())
    llvm::AMDGPU::fillValidArchListAMDGCN(Values, getTriple().getSubArch());
  else
    llvm::AMDGPU::fillValidArchListR600(Values);
}
 
AMDGPUTargetInfo::AMDGPUTargetInfo(const llvm::Triple &Triple,
                                   const TargetOptions &Opts)
    : TargetInfo(Triple),
      GPUKind(Triple.isAMDGCN()
                  ? (Opts.CPU.empty() ? llvm::AMDGPU::getGPUKindFromSubArch(
                                            Triple.getSubArch())
                                      : llvm::AMDGPU::parseArchAMDGCN(Opts.CPU))
                  : llvm::AMDGPU::parseArchR600(Opts.CPU)),
      GPUFeatures(Triple.isAMDGCN() ? llvm::AMDGPU::getArchAttrAMDGCN(GPUKind)
                                    : llvm::AMDGPU::getArchAttrR600(GPUKind)) {
  resetDataLayout();
 
  AddrSpaceMap = &AMDGPUAddrSpaceMap;
  UseAddrSpaceMapMangling = true;
  HasAMDGPUTypes = true;
 
  if (Triple.isAMDGCN()) {
    // __bf16 is always available as a load/store only type on AMDGCN.
    BFloat16Width = BFloat16Align = 16;
    BFloat16Format = &llvm::APFloat::BFloat();
  }
 
  // TODO: This is not really true for targets without half support, but also
  // should just be assumed true for the dummy target.
  HasFastHalfType = true;
  HasFloat16 = true;
  WavefrontSize = (GPUFeatures & llvm::AMDGPU::FEATURE_WAVE32) ? 32 : 64;
 
  // Set pointer width and alignment for the generic address space.
  PointerWidth = PointerAlign = getPointerWidthV(LangAS::Default);
  if (getMaxPointerWidth() == 64) {
    LongWidth = LongAlign = 64;
    SizeType = UnsignedLong;
    PtrDiffType = SignedLong;
    IntPtrType = SignedLong;
  }
 
  MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;
  CUMode = !(GPUFeatures & llvm::AMDGPU::FEATURE_WGP);
 
  for (auto F : {"image-insts", "gws", "vmem-to-lds-load-insts"}) {
    if (GPUKind != llvm::AMDGPU::GK_NONE)
      ReadOnlyFeatures.insert(F);
  }
  HalfArgsAndReturns = true;
 
  if (Opts.AMDGPUXnackState != TargetOptions::AMDGPUFeatureState::Any) {
    OffloadArchFeatures["xnack"] =
        Opts.AMDGPUXnackState == TargetOptions::AMDGPUFeatureState::Enabled;
  }
 
  if (Opts.AMDGPUSramEccState != TargetOptions::AMDGPUFeatureState::Any) {
    OffloadArchFeatures["sramecc"] =
        Opts.AMDGPUSramEccState == TargetOptions::AMDGPUFeatureState::Enabled;
  }
}
 
void AMDGPUTargetInfo::adjust(DiagnosticsEngine &Diags, LangOptions &Opts,
                              const TargetInfo *Aux) {
  TargetInfo::adjust(Diags, Opts, Aux);
  AtomicOpts = AtomicOptions(Opts);
}
 
llvm::SmallVector<Builtin::InfosShard>
AMDGPUTargetInfo::getTargetBuiltins() const {
  return {{&BuiltinStrings, BuiltinInfos}};
}
 
void AMDGPUTargetInfo::getTargetDefines(const LangOptions &Opts,
                                        MacroBuilder &Builder) const {
  Builder.defineMacro("__AMD__");
  Builder.defineMacro("__AMDGPU__");
 
  if (getTriple().isAMDGCN())
    Builder.defineMacro("__AMDGCN__");
  else
    Builder.defineMacro("__R600__");
 
  // TODO: __HAS_FMAF__, __HAS_LDEXPF__, __HAS_FP64__ are deprecated and will be
  // removed in the near future.
  if (hasFMAF())
    Builder.defineMacro("__HAS_FMAF__");
  if (hasFastFMAF())
    Builder.defineMacro("FP_FAST_FMAF");
  if (hasLDEXPF())
    Builder.defineMacro("__HAS_LDEXPF__");
  if (hasFP64())
    Builder.defineMacro("__HAS_FP64__");
  if (hasFastFMA())
    Builder.defineMacro("FP_FAST_FMA");
  if (HasFastHalfType)
    Builder.defineMacro("FP_FAST_FMA_HALF");
 
  Builder.defineMacro("__AMDGCN_CUMODE__", Twine(CUMode));
 
  // Legacy HIP host code relies on these default attributes to be defined.
  bool IsHIPHost = Opts.HIP && !Opts.CUDAIsDevice;
  if (GPUKind == llvm::AMDGPU::GK_NONE && !IsHIPHost)
    return;
 
  llvm::SmallString<16> CanonName =
      (getTriple().isAMDGCN() ? getArchNameAMDGCN(GPUKind)
                              : getArchNameR600(GPUKind));
 
  // Sanitize the name of generic targets, the only names containing '-'.
  // e.g. gfx10-1-generic -> gfx10_1_generic
  llvm::replace(CanonName, '-', '_');
 
  Builder.defineMacro(Twine("__") + Twine(CanonName) + Twine("__"));
  // Emit macros for gfx family e.g. gfx906 -> __GFX9__, gfx1030 -> __GFX10___
  if (getTriple().isAMDGCN() && !IsHIPHost) {
    assert(StringRef(CanonName).starts_with("gfx") &&
           "Invalid amdgcn canonical name");
    StringRef CanonFamilyName = getArchFamilyNameAMDGCN(GPUKind);
    Builder.defineMacro(Twine("__") + Twine(CanonFamilyName.upper()) +
                        Twine("__"));
    Builder.defineMacro("__amdgcn_processor__",
                        Twine("\"") + Twine(CanonName) + Twine("\""));
    Builder.defineMacro(
        "__amdgcn_target_id__",
        Twine("\"") +
            Twine(getCanonicalTargetID(getArchNameAMDGCN(GPUKind),
                                       OffloadArchFeatures)) +
            Twine("\""));
    for (auto F : getAllPossibleTargetIDFeatures(getTriple(), CanonName)) {
      auto Loc = OffloadArchFeatures.find(F);
      if (Loc != OffloadArchFeatures.end()) {
        std::string NewF = F.str();
        llvm::replace(NewF, '-', '_');
        Builder.defineMacro(Twine("__amdgcn_feature_") + Twine(NewF) +
                                Twine("__"),
                            Loc->second ? "1" : "0");
      }
    }
  }
 
  if (Opts.AtomicIgnoreDenormalMode)
    Builder.defineMacro("__AMDGCN_UNSAFE_FP_ATOMICS__");
}
 
void AMDGPUTargetInfo::setAuxTarget(const TargetInfo *Aux) {
  assert(HalfFormat == Aux->HalfFormat);
  assert(FloatFormat == Aux->FloatFormat);
  assert(DoubleFormat == Aux->DoubleFormat);
 
  // On x86_64 long double is 80-bit extended precision format, which is
  // not supported by AMDGPU. 128-bit floating point format is also not
  // supported by AMDGPU. Therefore keep its own format for these two types.
  auto SaveLongDoubleFormat = LongDoubleFormat;
  auto SaveFloat128Format = Float128Format;
  auto SaveLongDoubleWidth = LongDoubleWidth;
  auto SaveLongDoubleAlign = LongDoubleAlign;
  copyAuxTarget(Aux);
  LongDoubleFormat = SaveLongDoubleFormat;
  Float128Format = SaveFloat128Format;
  LongDoubleWidth = SaveLongDoubleWidth;
  LongDoubleAlign = SaveLongDoubleAlign;
  // For certain builtin types support on the host target, claim they are
  // support to pass the compilation of the host code during the device-side
  // compilation.
  // FIXME: As the side effect, we also accept `__float128` uses in the device
  // code. To rejct these builtin types supported in the host target but not in
  // the device target, one approach would support `device_builtin` attribute
  // so that we could tell the device builtin types from the host ones. The
  // also solves the different representations of the same builtin type, such
  // as `size_t` in the MSVC environment.
  if (Aux->hasFloat128Type()) {
    HasFloat128 = true;
    Float128Format = DoubleFormat;
  }
}