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[RISCV] Allow YAML file to control multilib selection #98856

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Aug 16, 2024
Merged

[RISCV] Allow YAML file to control multilib selection #98856

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19 changes: 19 additions & 0 deletions clang/lib/Driver/ToolChain.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
#include "clang/Driver/ToolChain.h"
#include "ToolChains/Arch/AArch64.h"
#include "ToolChains/Arch/ARM.h"
#include "ToolChains/Arch/RISCV.h"
#include "ToolChains/Clang.h"
#include "ToolChains/CommonArgs.h"
#include "ToolChains/Flang.h"
Expand Down Expand Up @@ -43,6 +44,7 @@
#include "llvm/Support/VersionTuple.h"
#include "llvm/Support/VirtualFileSystem.h"
#include "llvm/TargetParser/AArch64TargetParser.h"
#include "llvm/TargetParser/RISCVISAInfo.h"
#include "llvm/TargetParser/TargetParser.h"
#include "llvm/TargetParser/Triple.h"
#include <cassert>
Expand Down Expand Up @@ -258,6 +260,19 @@ static void getARMMultilibFlags(const Driver &D,
}
}

static void getRISCVMultilibFlags(const Driver &D, const llvm::Triple &Triple,
const llvm::opt::ArgList &Args,
Multilib::flags_list &Result) {
std::string Arch = riscv::getRISCVArch(Args, Triple);
// Canonicalize arch for easier matching
auto ISAInfo = llvm::RISCVISAInfo::parseArchString(
Arch, /*EnableExperimentalExtensions*/ true);
if (!llvm::errorToBool(ISAInfo.takeError()))
Result.push_back("-march=" + (*ISAInfo)->toString());

Result.push_back(("-mabi=" + riscv::getRISCVABI(Args, Triple)).str());
}

Multilib::flags_list
ToolChain::getMultilibFlags(const llvm::opt::ArgList &Args) const {
using namespace clang::driver::options;
Expand All @@ -278,6 +293,10 @@ ToolChain::getMultilibFlags(const llvm::opt::ArgList &Args) const {
case llvm::Triple::thumbeb:
getARMMultilibFlags(D, Triple, Args, Result);
break;
case llvm::Triple::riscv32:
case llvm::Triple::riscv64:
getRISCVMultilibFlags(D, Triple, Args, Result);
break;
default:
break;
}
Expand Down
16 changes: 9 additions & 7 deletions clang/lib/Driver/ToolChains/BareMetal.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -218,17 +218,19 @@ static std::string computeBaseSysRoot(const Driver &D,
void BareMetal::findMultilibs(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args) {
DetectedMultilibs Result;
if (isRISCVBareMetal(Triple)) {
// Look for a multilib.yaml before trying target-specific hardwired logic.
// If it exists, always do what it specifies.
llvm::SmallString<128> MultilibPath(computeBaseSysRoot(D, Triple));
llvm::sys::path::append(MultilibPath, MultilibFilename);
if (D.getVFS().exists(MultilibPath)) {
findMultilibsFromYAML(*this, D, MultilibPath, Args, Result);
SelectedMultilibs = Result.SelectedMultilibs;
Multilibs = Result.Multilibs;
} else if (isRISCVBareMetal(Triple)) {
if (findRISCVMultilibs(D, Triple, Args, Result)) {
SelectedMultilibs = Result.SelectedMultilibs;
Multilibs = Result.Multilibs;
}
} else {
llvm::SmallString<128> MultilibPath(computeBaseSysRoot(D, Triple));
llvm::sys::path::append(MultilibPath, MultilibFilename);
findMultilibsFromYAML(*this, D, MultilibPath, Args, Result);
SelectedMultilibs = Result.SelectedMultilibs;
Multilibs = Result.Multilibs;
}
}

Expand Down
15 changes: 15 additions & 0 deletions clang/test/Driver/print-multi-selection-flags.c
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Original file line number Diff line number Diff line change
Expand Up @@ -58,3 +58,18 @@
// RUN: %clang -print-multi-flags-experimental --target=aarch64-none-elf -march=armv9-a | FileCheck --check-prefix=CHECK-SVE2 %s
// CHECK-SVE2: --target=aarch64-unknown-none-elf
// CHECK-SVE2: -march=armv{{.*}}-a{{.*}}+simd{{.*}}+sve{{.*}}+sve2{{.*}}

// RUN: %clang -print-multi-flags-experimental --target=riscv32-none-elf -march=rv32g | FileCheck --check-prefix=CHECK-RV32 %s
// CHECK-RV32: --target=riscv32-unknown-none-elf
// CHECK-RV32: -mabi=ilp32d
// CHECK-RV32: -march=rv32i{{[0-9]+p[0-9]+}}_m{{[0-9]+p[0-9]+}}_a{{[0-9]+p[0-9]+}}_f{{[0-9]+p[0-9]+}}_d{{[0-9]+p[0-9]+}}_zicsr{{[0-9]+p[0-9]+}}_zifencei{{[0-9]+p[0-9]+}}_zmmul{{[0-9]+p[0-9]+}}

// RUN: %clang -print-multi-flags-experimental --target=riscv64-none-elf -march=rv64g | FileCheck --check-prefix=CHECK-RV64 %s
// CHECK-RV64: --target=riscv64-unknown-none-elf
// CHECK-RV64: -mabi=lp64d
// CHECK-RV64: -march=rv64i{{[0-9]+p[0-9]+}}_m{{[0-9]+p[0-9]+}}_a{{[0-9]+p[0-9]+}}_f{{[0-9]+p[0-9]+}}_d{{[0-9]+p[0-9]+}}_zicsr{{[0-9]+p[0-9]+}}_zifencei{{[0-9]+p[0-9]+}}_zmmul{{[0-9]+p[0-9]+}}

// RUN: %clang -print-multi-flags-experimental --target=riscv32-none-elf -march=rv32e_zicsr_c | FileCheck --check-prefix=CHECK-RV32E-ORDER %s
// CHECK-RV32E-ORDER: --target=riscv32-unknown-none-elf
// CHECK-RV32E-ORDER: -mabi=ilp32e
// CHECK-RV32E-ORDER: -march=rv32e{{[0-9]+p[0-9]+}}_c{{[0-9]+p[0-9]+}}_zicsr{{[0-9]+p[0-9]+}}
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