d1e28e2a7b
This implements the __builtin_cpu_init and __builtin_cpu_supports builtin routines based on the compiler runtime changes in https://github.com/llvm/llvm-project/pull/85790. This is inspired by https://github.com/llvm/llvm-project/pull/85786. Major changes are a) a restriction in scope to only the builtins (which have a much narrower user interface), and the avoidance of false generality. This change deliberately only handles group 0 extensions (which happen to be all defined ones today), and avoids the tblgen changes from that review. I don't have an environment in which I can actually test this, but @BeMg has been kind enough to report that this appears to work as expected. Before this can make it into a release, we need a change such as https://github.com/llvm/llvm-project/pull/99958. The gcc docs claim that cpu_support can be called by "normal" code without calling the cpu_init routine because the init routine will have been called by a high priority constructor. Our current compiler-rt mechanism does not do this.
488 lines
17 KiB
C++
488 lines
17 KiB
C++
//===--- RISCV.cpp - Implement RISC-V target feature support --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements RISC-V TargetInfo objects.
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//
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//===----------------------------------------------------------------------===//
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#include "RISCV.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/MacroBuilder.h"
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#include "clang/Basic/TargetBuiltins.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/TargetParser/RISCVTargetParser.h"
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#include <optional>
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using namespace clang;
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using namespace clang::targets;
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ArrayRef<const char *> RISCVTargetInfo::getGCCRegNames() const {
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// clang-format off
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static const char *const GCCRegNames[] = {
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// Integer registers
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"x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
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"x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
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"x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23",
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"x24", "x25", "x26", "x27", "x28", "x29", "x30", "x31",
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// Floating point registers
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
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"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
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"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
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"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
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// Vector registers
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"v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7",
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"v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15",
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"v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",
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"v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",
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// CSRs
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"fflags", "frm", "vtype", "vl", "vxsat", "vxrm"
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};
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// clang-format on
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return llvm::ArrayRef(GCCRegNames);
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}
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ArrayRef<TargetInfo::GCCRegAlias> RISCVTargetInfo::getGCCRegAliases() const {
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static const TargetInfo::GCCRegAlias GCCRegAliases[] = {
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{{"zero"}, "x0"}, {{"ra"}, "x1"}, {{"sp"}, "x2"}, {{"gp"}, "x3"},
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{{"tp"}, "x4"}, {{"t0"}, "x5"}, {{"t1"}, "x6"}, {{"t2"}, "x7"},
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{{"s0"}, "x8"}, {{"s1"}, "x9"}, {{"a0"}, "x10"}, {{"a1"}, "x11"},
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{{"a2"}, "x12"}, {{"a3"}, "x13"}, {{"a4"}, "x14"}, {{"a5"}, "x15"},
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{{"a6"}, "x16"}, {{"a7"}, "x17"}, {{"s2"}, "x18"}, {{"s3"}, "x19"},
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{{"s4"}, "x20"}, {{"s5"}, "x21"}, {{"s6"}, "x22"}, {{"s7"}, "x23"},
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{{"s8"}, "x24"}, {{"s9"}, "x25"}, {{"s10"}, "x26"}, {{"s11"}, "x27"},
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{{"t3"}, "x28"}, {{"t4"}, "x29"}, {{"t5"}, "x30"}, {{"t6"}, "x31"},
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{{"ft0"}, "f0"}, {{"ft1"}, "f1"}, {{"ft2"}, "f2"}, {{"ft3"}, "f3"},
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{{"ft4"}, "f4"}, {{"ft5"}, "f5"}, {{"ft6"}, "f6"}, {{"ft7"}, "f7"},
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{{"fs0"}, "f8"}, {{"fs1"}, "f9"}, {{"fa0"}, "f10"}, {{"fa1"}, "f11"},
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{{"fa2"}, "f12"}, {{"fa3"}, "f13"}, {{"fa4"}, "f14"}, {{"fa5"}, "f15"},
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{{"fa6"}, "f16"}, {{"fa7"}, "f17"}, {{"fs2"}, "f18"}, {{"fs3"}, "f19"},
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{{"fs4"}, "f20"}, {{"fs5"}, "f21"}, {{"fs6"}, "f22"}, {{"fs7"}, "f23"},
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{{"fs8"}, "f24"}, {{"fs9"}, "f25"}, {{"fs10"}, "f26"}, {{"fs11"}, "f27"},
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{{"ft8"}, "f28"}, {{"ft9"}, "f29"}, {{"ft10"}, "f30"}, {{"ft11"}, "f31"}};
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return llvm::ArrayRef(GCCRegAliases);
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}
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bool RISCVTargetInfo::validateAsmConstraint(
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const char *&Name, TargetInfo::ConstraintInfo &Info) const {
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switch (*Name) {
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default:
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return false;
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case 'I':
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// A 12-bit signed immediate.
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Info.setRequiresImmediate(-2048, 2047);
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return true;
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case 'J':
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// Integer zero.
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Info.setRequiresImmediate(0);
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return true;
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case 'K':
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// A 5-bit unsigned immediate for CSR access instructions.
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Info.setRequiresImmediate(0, 31);
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return true;
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case 'f':
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// A floating-point register.
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Info.setAllowsRegister();
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return true;
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case 'A':
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// An address that is held in a general-purpose register.
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Info.setAllowsMemory();
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return true;
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case 's':
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case 'S': // A symbol or label reference with a constant offset
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Info.setAllowsRegister();
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return true;
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case 'v':
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// A vector register.
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if (Name[1] == 'r' || Name[1] == 'm') {
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Info.setAllowsRegister();
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Name += 1;
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return true;
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}
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return false;
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}
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}
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std::string RISCVTargetInfo::convertConstraint(const char *&Constraint) const {
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std::string R;
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switch (*Constraint) {
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case 'v':
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R = std::string("^") + std::string(Constraint, 2);
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Constraint += 1;
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break;
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default:
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R = TargetInfo::convertConstraint(Constraint);
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break;
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}
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return R;
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}
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static unsigned getVersionValue(unsigned MajorVersion, unsigned MinorVersion) {
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return MajorVersion * 1000000 + MinorVersion * 1000;
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}
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void RISCVTargetInfo::getTargetDefines(const LangOptions &Opts,
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MacroBuilder &Builder) const {
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Builder.defineMacro("__riscv");
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bool Is64Bit = getTriple().isRISCV64();
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Builder.defineMacro("__riscv_xlen", Is64Bit ? "64" : "32");
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StringRef CodeModel = getTargetOpts().CodeModel;
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unsigned FLen = ISAInfo->getFLen();
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unsigned MinVLen = ISAInfo->getMinVLen();
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unsigned MaxELen = ISAInfo->getMaxELen();
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unsigned MaxELenFp = ISAInfo->getMaxELenFp();
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if (CodeModel == "default")
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CodeModel = "small";
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if (CodeModel == "small")
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Builder.defineMacro("__riscv_cmodel_medlow");
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else if (CodeModel == "medium")
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Builder.defineMacro("__riscv_cmodel_medany");
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StringRef ABIName = getABI();
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if (ABIName == "ilp32f" || ABIName == "lp64f")
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Builder.defineMacro("__riscv_float_abi_single");
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else if (ABIName == "ilp32d" || ABIName == "lp64d")
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Builder.defineMacro("__riscv_float_abi_double");
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else
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Builder.defineMacro("__riscv_float_abi_soft");
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if (ABIName == "ilp32e" || ABIName == "lp64e")
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Builder.defineMacro("__riscv_abi_rve");
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Builder.defineMacro("__riscv_arch_test");
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for (auto &Extension : ISAInfo->getExtensions()) {
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auto ExtName = Extension.first;
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auto ExtInfo = Extension.second;
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Builder.defineMacro(Twine("__riscv_", ExtName),
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Twine(getVersionValue(ExtInfo.Major, ExtInfo.Minor)));
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}
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if (ISAInfo->hasExtension("zmmul"))
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Builder.defineMacro("__riscv_mul");
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if (ISAInfo->hasExtension("m")) {
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Builder.defineMacro("__riscv_div");
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Builder.defineMacro("__riscv_muldiv");
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}
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if (ISAInfo->hasExtension("a")) {
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Builder.defineMacro("__riscv_atomic");
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Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1");
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Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2");
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Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4");
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if (Is64Bit)
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Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8");
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}
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if (FLen) {
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Builder.defineMacro("__riscv_flen", Twine(FLen));
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Builder.defineMacro("__riscv_fdiv");
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Builder.defineMacro("__riscv_fsqrt");
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}
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if (MinVLen) {
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Builder.defineMacro("__riscv_v_min_vlen", Twine(MinVLen));
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Builder.defineMacro("__riscv_v_elen", Twine(MaxELen));
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Builder.defineMacro("__riscv_v_elen_fp", Twine(MaxELenFp));
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}
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if (ISAInfo->hasExtension("c"))
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Builder.defineMacro("__riscv_compressed");
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if (ISAInfo->hasExtension("zve32x")) {
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Builder.defineMacro("__riscv_vector");
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// Currently we support the v0.12 RISC-V V intrinsics.
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Builder.defineMacro("__riscv_v_intrinsic", Twine(getVersionValue(0, 12)));
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}
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auto VScale = getVScaleRange(Opts);
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if (VScale && VScale->first && VScale->first == VScale->second)
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Builder.defineMacro("__riscv_v_fixed_vlen",
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Twine(VScale->first * llvm::RISCV::RVVBitsPerBlock));
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if (FastScalarUnalignedAccess)
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Builder.defineMacro("__riscv_misaligned_fast");
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else
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Builder.defineMacro("__riscv_misaligned_avoid");
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if (ISAInfo->hasExtension("e")) {
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if (Is64Bit)
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Builder.defineMacro("__riscv_64e");
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else
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Builder.defineMacro("__riscv_32e");
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}
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}
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static constexpr Builtin::Info BuiltinInfo[] = {
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#define BUILTIN(ID, TYPE, ATTRS) \
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{#ID, TYPE, ATTRS, nullptr, HeaderDesc::NO_HEADER, ALL_LANGUAGES},
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#define TARGET_BUILTIN(ID, TYPE, ATTRS, FEATURE) \
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{#ID, TYPE, ATTRS, FEATURE, HeaderDesc::NO_HEADER, ALL_LANGUAGES},
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#include "clang/Basic/BuiltinsRISCVVector.def"
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#define BUILTIN(ID, TYPE, ATTRS) \
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{#ID, TYPE, ATTRS, nullptr, HeaderDesc::NO_HEADER, ALL_LANGUAGES},
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#define TARGET_BUILTIN(ID, TYPE, ATTRS, FEATURE) \
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{#ID, TYPE, ATTRS, FEATURE, HeaderDesc::NO_HEADER, ALL_LANGUAGES},
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#include "clang/Basic/BuiltinsRISCV.inc"
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};
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ArrayRef<Builtin::Info> RISCVTargetInfo::getTargetBuiltins() const {
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return llvm::ArrayRef(BuiltinInfo,
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clang::RISCV::LastTSBuiltin - Builtin::FirstTSBuiltin);
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}
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bool RISCVTargetInfo::initFeatureMap(
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llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU,
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const std::vector<std::string> &FeaturesVec) const {
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unsigned XLen = 32;
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if (getTriple().isRISCV64()) {
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Features["64bit"] = true;
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XLen = 64;
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} else {
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Features["32bit"] = true;
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}
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// If a target attribute specified a full arch string, override all the ISA
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// extension target features.
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const auto I = llvm::find(FeaturesVec, "__RISCV_TargetAttrNeedOverride");
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if (I != FeaturesVec.end()) {
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std::vector<std::string> OverrideFeatures(std::next(I), FeaturesVec.end());
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// Add back any non ISA extension features, e.g. +relax.
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auto IsNonISAExtFeature = [](StringRef Feature) {
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assert(Feature.size() > 1 && (Feature[0] == '+' || Feature[0] == '-'));
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StringRef Ext = Feature.substr(1); // drop the +/-
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return !llvm::RISCVISAInfo::isSupportedExtensionFeature(Ext);
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};
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llvm::copy_if(llvm::make_range(FeaturesVec.begin(), I),
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std::back_inserter(OverrideFeatures), IsNonISAExtFeature);
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return TargetInfo::initFeatureMap(Features, Diags, CPU, OverrideFeatures);
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}
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// Otherwise, parse the features and add any implied extensions.
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std::vector<std::string> AllFeatures = FeaturesVec;
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auto ParseResult = llvm::RISCVISAInfo::parseFeatures(XLen, FeaturesVec);
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if (!ParseResult) {
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std::string Buffer;
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llvm::raw_string_ostream OutputErrMsg(Buffer);
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handleAllErrors(ParseResult.takeError(), [&](llvm::StringError &ErrMsg) {
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OutputErrMsg << ErrMsg.getMessage();
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});
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Diags.Report(diag::err_invalid_feature_combination) << OutputErrMsg.str();
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return false;
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}
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// Append all features, not just new ones, so we override any negatives.
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llvm::append_range(AllFeatures, (*ParseResult)->toFeatures());
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return TargetInfo::initFeatureMap(Features, Diags, CPU, AllFeatures);
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}
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std::optional<std::pair<unsigned, unsigned>>
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RISCVTargetInfo::getVScaleRange(const LangOptions &LangOpts) const {
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// RISCV::RVVBitsPerBlock is 64.
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unsigned VScaleMin = ISAInfo->getMinVLen() / llvm::RISCV::RVVBitsPerBlock;
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if (LangOpts.VScaleMin || LangOpts.VScaleMax) {
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// Treat Zvl*b as a lower bound on vscale.
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VScaleMin = std::max(VScaleMin, LangOpts.VScaleMin);
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unsigned VScaleMax = LangOpts.VScaleMax;
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if (VScaleMax != 0 && VScaleMax < VScaleMin)
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VScaleMax = VScaleMin;
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return std::pair<unsigned, unsigned>(VScaleMin ? VScaleMin : 1, VScaleMax);
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}
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if (VScaleMin > 0) {
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unsigned VScaleMax = ISAInfo->getMaxVLen() / llvm::RISCV::RVVBitsPerBlock;
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return std::make_pair(VScaleMin, VScaleMax);
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}
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return std::nullopt;
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}
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/// Return true if has this feature, need to sync with handleTargetFeatures.
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bool RISCVTargetInfo::hasFeature(StringRef Feature) const {
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bool Is64Bit = getTriple().isRISCV64();
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auto Result = llvm::StringSwitch<std::optional<bool>>(Feature)
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.Case("riscv", true)
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.Case("riscv32", !Is64Bit)
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.Case("riscv64", Is64Bit)
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.Case("32bit", !Is64Bit)
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.Case("64bit", Is64Bit)
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.Case("experimental", HasExperimental)
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.Default(std::nullopt);
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if (Result)
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return *Result;
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return ISAInfo->hasExtension(Feature);
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}
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/// Perform initialization based on the user configured set of features.
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bool RISCVTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
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DiagnosticsEngine &Diags) {
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unsigned XLen = getTriple().isArch64Bit() ? 64 : 32;
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auto ParseResult = llvm::RISCVISAInfo::parseFeatures(XLen, Features);
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if (!ParseResult) {
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std::string Buffer;
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llvm::raw_string_ostream OutputErrMsg(Buffer);
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handleAllErrors(ParseResult.takeError(), [&](llvm::StringError &ErrMsg) {
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OutputErrMsg << ErrMsg.getMessage();
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});
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Diags.Report(diag::err_invalid_feature_combination) << OutputErrMsg.str();
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return false;
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} else {
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ISAInfo = std::move(*ParseResult);
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}
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if (ABI.empty())
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ABI = ISAInfo->computeDefaultABI().str();
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if (ISAInfo->hasExtension("zfh") || ISAInfo->hasExtension("zhinx"))
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HasLegalHalfType = true;
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FastScalarUnalignedAccess =
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llvm::is_contained(Features, "+unaligned-scalar-mem");
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if (llvm::is_contained(Features, "+experimental"))
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HasExperimental = true;
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if (ABI == "ilp32e" && ISAInfo->hasExtension("d")) {
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Diags.Report(diag::err_invalid_feature_combination)
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<< "ILP32E cannot be used with the D ISA extension";
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return false;
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}
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return true;
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}
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bool RISCVTargetInfo::isValidCPUName(StringRef Name) const {
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bool Is64Bit = getTriple().isArch64Bit();
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return llvm::RISCV::parseCPU(Name, Is64Bit);
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}
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void RISCVTargetInfo::fillValidCPUList(
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SmallVectorImpl<StringRef> &Values) const {
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bool Is64Bit = getTriple().isArch64Bit();
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llvm::RISCV::fillValidCPUArchList(Values, Is64Bit);
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}
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bool RISCVTargetInfo::isValidTuneCPUName(StringRef Name) const {
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bool Is64Bit = getTriple().isArch64Bit();
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return llvm::RISCV::parseTuneCPU(Name, Is64Bit);
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}
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void RISCVTargetInfo::fillValidTuneCPUList(
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SmallVectorImpl<StringRef> &Values) const {
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bool Is64Bit = getTriple().isArch64Bit();
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llvm::RISCV::fillValidTuneCPUArchList(Values, Is64Bit);
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}
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static void handleFullArchString(StringRef FullArchStr,
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std::vector<std::string> &Features) {
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Features.push_back("__RISCV_TargetAttrNeedOverride");
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auto RII = llvm::RISCVISAInfo::parseArchString(
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FullArchStr, /* EnableExperimentalExtension */ true);
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if (llvm::errorToBool(RII.takeError())) {
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// Forward the invalid FullArchStr.
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Features.push_back("+" + FullArchStr.str());
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} else {
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// Append a full list of features, including any negative extensions so that
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// we override the CPU's features.
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std::vector<std::string> FeatStrings =
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(*RII)->toFeatures(/* AddAllExtensions */ true);
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Features.insert(Features.end(), FeatStrings.begin(), FeatStrings.end());
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}
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}
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ParsedTargetAttr RISCVTargetInfo::parseTargetAttr(StringRef Features) const {
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ParsedTargetAttr Ret;
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if (Features == "default")
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return Ret;
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SmallVector<StringRef, 1> AttrFeatures;
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Features.split(AttrFeatures, ";");
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bool FoundArch = false;
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for (auto &Feature : AttrFeatures) {
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Feature = Feature.trim();
|
|
StringRef AttrString = Feature.split("=").second.trim();
|
|
|
|
if (Feature.starts_with("arch=")) {
|
|
// Override last features
|
|
Ret.Features.clear();
|
|
if (FoundArch)
|
|
Ret.Duplicate = "arch=";
|
|
FoundArch = true;
|
|
|
|
if (AttrString.starts_with("+")) {
|
|
// EXTENSION like arch=+v,+zbb
|
|
SmallVector<StringRef, 1> Exts;
|
|
AttrString.split(Exts, ",");
|
|
for (auto Ext : Exts) {
|
|
if (Ext.empty())
|
|
continue;
|
|
|
|
StringRef ExtName = Ext.substr(1);
|
|
std::string TargetFeature =
|
|
llvm::RISCVISAInfo::getTargetFeatureForExtension(ExtName);
|
|
if (!TargetFeature.empty())
|
|
Ret.Features.push_back(Ext.front() + TargetFeature);
|
|
else
|
|
Ret.Features.push_back(Ext.str());
|
|
}
|
|
} else {
|
|
// full-arch-string like arch=rv64gcv
|
|
handleFullArchString(AttrString, Ret.Features);
|
|
}
|
|
} else if (Feature.starts_with("cpu=")) {
|
|
if (!Ret.CPU.empty())
|
|
Ret.Duplicate = "cpu=";
|
|
|
|
Ret.CPU = AttrString;
|
|
|
|
if (!FoundArch) {
|
|
// Update Features with CPU's features
|
|
StringRef MarchFromCPU = llvm::RISCV::getMArchFromMcpu(Ret.CPU);
|
|
if (MarchFromCPU != "") {
|
|
Ret.Features.clear();
|
|
handleFullArchString(MarchFromCPU, Ret.Features);
|
|
}
|
|
}
|
|
} else if (Feature.starts_with("tune=")) {
|
|
if (!Ret.Tune.empty())
|
|
Ret.Duplicate = "tune=";
|
|
|
|
Ret.Tune = AttrString;
|
|
}
|
|
}
|
|
return Ret;
|
|
}
|
|
|
|
TargetInfo::CallingConvCheckResult
|
|
RISCVTargetInfo::checkCallingConvention(CallingConv CC) const {
|
|
switch (CC) {
|
|
default:
|
|
return CCCR_Warning;
|
|
case CC_C:
|
|
case CC_RISCVVectorCall:
|
|
return CCCR_OK;
|
|
}
|
|
}
|
|
|
|
bool RISCVTargetInfo::validateCpuSupports(StringRef Feature) const {
|
|
// Only allow extensions we have a known bit position for in the
|
|
// __riscv_feature_bits structure.
|
|
return -1 != llvm::RISCVISAInfo::getRISCVFeaturesBitPosition(Feature);
|
|
}
|