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RuntimeLibcalls: Really move default libcall handling to tablegen #148780

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5 changes: 0 additions & 5 deletions llvm/include/llvm/IR/RuntimeLibcalls.h
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Original file line number Diff line number Diff line change
Expand Up @@ -128,9 +128,6 @@ struct RuntimeLibcallsInfo {
}

private:
static const RTLIB::LibcallImpl
DefaultLibcallImpls[RTLIB::UNKNOWN_LIBCALL + 1];

/// Stores the implementation choice for each each libcall.
RTLIB::LibcallImpl LibcallImpls[RTLIB::UNKNOWN_LIBCALL + 1] = {
RTLIB::Unsupported};
Expand Down Expand Up @@ -178,8 +175,6 @@ struct RuntimeLibcallsInfo {
return hasSinCos(TT) || TT.isPS();
}

LLVM_ABI void initDefaultLibCallImpls();

/// Generated by tablegen.
void setTargetRuntimeLibcallSets(const Triple &TT,
FloatABI::ABIType FloatABI);
Expand Down
36 changes: 33 additions & 3 deletions llvm/include/llvm/IR/RuntimeLibcalls.td
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Expand Up @@ -1581,7 +1581,9 @@ def HexagonSystemLibrary
(add (sub DefaultLibcallImpls32,
__adddf3, __divsf3, __udivsi3, __udivdi3,
__umoddi3, __divdf3, __muldf3, __divsi3, __subdf3, sqrtf,
__divdi3, __umodsi3, __moddi3, __modsi3), HexagonLibcalls)>;
__divdi3, __umodsi3, __moddi3, __modsi3), HexagonLibcalls,
LibmHasSinCosF32, LibmHasSinCosF64, LibmHasSinCosF128,
exp10f, exp10, exp10l_f128)>;

//===----------------------------------------------------------------------===//
// Lanai Runtime Libcalls
Expand Down Expand Up @@ -2128,8 +2130,12 @@ def __memcpy_4 : RuntimeLibcallImpl<MEMCPY_ALIGN_4>;

def isXCore : RuntimeLibcallPredicate<"TT.getArch() == Triple::xcore">;
def XCoreSystemLibrary
: SystemRuntimeLibrary<isXCore, (add DefaultRuntimeLibcallImpls,
__memcpy_4)>;
: SystemRuntimeLibrary<isXCore,
(add DefaultRuntimeLibcallImpls,
exp10f, exp10, exp10l_f128,
__memcpy_4,
LibcallImpls<(add LibmF128Libcalls, LibmF128FiniteLibcalls), isGNUEnvironment>
)>;

//===----------------------------------------------------------------------===//
// ZOS Runtime Libcalls
Expand Down Expand Up @@ -2246,3 +2252,27 @@ def WasmSystemLibrary
CompilerRTOnlyInt64Libcalls, CompilerRTOnlyInt128Libcalls,
exp10f, exp10,
emscripten_return_address)>;

//===----------------------------------------------------------------------===//
// Legacy Default Runtime Libcalls
//===----------------------------------------------------------------------===//

// TODO: Should make every target explicit.
def isDefaultLibcallArch : RuntimeLibcallPredicate<[{
TT.isMIPS() || TT.isLoongArch() || TT.isVE() || TT.isBPF() ||
TT.getArch() == Triple::csky || TT.getArch() == Triple::arc ||
TT.getArch() == Triple::m68k || TT.getArch() == Triple::xtensa ||
(TT.isSystemZ() && !TT.isOSzOS()) ||
TT.isSPIRV() || TT.isDXIL()
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This goes away when #148628 and #148631 land

}]>;


def isArch64Bit : RuntimeLibcallPredicate<[{TT.isArch64Bit()}]>;
def LegacyDefaultSystemLibrary
: SystemRuntimeLibrary<isDefaultLibcallArch,
(add DefaultRuntimeLibcallImpls,
LibmHasSinCosF32, LibmHasSinCosF64, LibmHasSinCosF128,
exp10f, exp10, exp10l_f128,
__powisf2, __powidf2, __powitf2_f128,
LibcallImpls<(add Int128RTLibcalls), isArch64Bit>
)>;
42 changes: 3 additions & 39 deletions llvm/lib/IR/RuntimeLibcalls.cpp
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Expand Up @@ -7,6 +7,9 @@
//===----------------------------------------------------------------------===//

#include "llvm/IR/RuntimeLibcalls.h"
#include "llvm/Support/Debug.h"

#define DEBUG_TYPE "runtime-libcalls-info"

using namespace llvm;
using namespace RTLIB;
Expand Down Expand Up @@ -61,12 +64,6 @@ static void setARMLibcallNames(RuntimeLibcallsInfo &Info, const Triple &TT,
Info.setLibcallImplCallingConv(Impl, CallingConv::ARM_AAPCS);
}

void RTLIB::RuntimeLibcallsInfo::initDefaultLibCallImpls() {
std::memcpy(LibcallImpls, DefaultLibcallImpls, sizeof(LibcallImpls));
static_assert(sizeof(LibcallImpls) == sizeof(DefaultLibcallImpls),
"libcall array size should match");
}

/// Set default libcall names. If a target wants to opt-out of a libcall it
/// should be placed here.
void RuntimeLibcallsInfo::initLibcalls(const Triple &TT,
Expand All @@ -75,10 +72,6 @@ void RuntimeLibcallsInfo::initLibcalls(const Triple &TT,
EABI EABIVersion, StringRef ABIName) {
setTargetRuntimeLibcallSets(TT, FloatABI);

// Early exit for targets that have fully ported to tablegen.
if (TT.isAMDGPU() || TT.isNVPTX() || TT.isWasm())
return;

if (TT.isX86() || TT.isVE() || TT.isARM() || TT.isThumb()) {
if (ExceptionModel == ExceptionHandling::SjLj)
setLibcallImpl(RTLIB::UNWIND_RESUME, RTLIB::_Unwind_SjLj_Resume);
Expand All @@ -91,46 +84,17 @@ void RuntimeLibcallsInfo::initLibcalls(const Triple &TT,
// FIXME: What about other targets?
setLibcallImpl(RTLIB::FPEXT_F16_F32, RTLIB::__extendhfsf2);
setLibcallImpl(RTLIB::FPROUND_F32_F16, RTLIB::__truncsfhf2);

if (!darwinHasExp10(TT)) {
setLibcallImpl(RTLIB::EXP10_F32, RTLIB::Unsupported);
setLibcallImpl(RTLIB::EXP10_F64, RTLIB::Unsupported);
}
}

if (TT.isOSOpenBSD()) {
setLibcallImpl(RTLIB::STACKPROTECTOR_CHECK_FAIL, RTLIB::Unsupported);
}

// Skip default manual processing for targets that have been mostly ported to
// tablegen for now. Eventually the rest of this should be deleted.
if (TT.isX86() || TT.isAArch64() || TT.isWasm() || TT.isPPC())
return;

if (TT.isARM() || TT.isThumb()) {
setARMLibcallNames(*this, TT, FloatABI, EABIVersion);
return;
}

if (hasSinCos(TT)) {
setLibcallImpl(RTLIB::SINCOS_F32, RTLIB::sincosf);
setLibcallImpl(RTLIB::SINCOS_F64, RTLIB::sincos);
setLibcallImpl(RTLIB::SINCOS_F128, RTLIB::sincos_f128);
}

setLibcallImpl(RTLIB::EXP10_F32, RTLIB::exp10f);
setLibcallImpl(RTLIB::EXP10_F64, RTLIB::exp10);
setLibcallImpl(RTLIB::EXP10_F128, RTLIB::exp10l_f128);

// These libcalls are only available in compiler-rt, not libgcc.
if (TT.isArch64Bit()) {
setLibcallImpl(RTLIB::SHL_I128, RTLIB::__ashlti3);
setLibcallImpl(RTLIB::SRL_I128, RTLIB::__lshrti3);
setLibcallImpl(RTLIB::SRA_I128, RTLIB::__ashrti3);
setLibcallImpl(RTLIB::MUL_I128, RTLIB::__multi3);
setLibcallImpl(RTLIB::MULO_I64, RTLIB::__mulodi4);
}

if (TT.getArch() == Triple::ArchType::msp430) {
setLibcallImplCallingConv(RTLIB::__mspabi_mpyll,
CallingConv::MSP430_BUILTIN);
Expand Down
14 changes: 1 addition & 13 deletions llvm/test/TableGen/RuntimeLibcallEmitter.td
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Expand Up @@ -104,18 +104,6 @@ def BlahLibrary : SystemRuntimeLibrary<isBlahArch, (add calloc, LibraryWithCondi
// CHECK-NEXT: #endif

// CHECK: #ifdef GET_INIT_RUNTIME_LIBCALL_NAMES
// CHECK-NEXT: const RTLIB::LibcallImpl llvm::RTLIB::RuntimeLibcallsInfo::DefaultLibcallImpls[RTLIB::UNKNOWN_LIBCALL + 1] = {
// CHECK-NEXT: RTLIB::Unsupported, // RTLIB::BZERO
// CHECK-NEXT: RTLIB::Unsupported, // RTLIB::CALLOC
// CHECK-NEXT: RTLIB::Unsupported, // RTLIB::MEMCPY
// CHECK-NEXT: RTLIB::Unsupported, // RTLIB::MEMSET
// CHECK-NEXT: RTLIB::__ashlsi3, // RTLIB::SHL_I32
// CHECK-NEXT: RTLIB::sqrtl_f80, // RTLIB::SQRT_F80
// CHECK-NEXT: RTLIB::sqrtl_f128, // RTLIB::SQRT_F128
// CHECK-NEXT: RTLIB::__lshrdi3, // RTLIB::SRL_I64
// CHECK-NEXT: RTLIB::Unsupported
// CHECK-NEXT: };
// CHECK-EMPTY:
// CHECK-NEXT: const char *const llvm::RTLIB::RuntimeLibcallsInfo::LibCallImplNames[RTLIB::NumLibcallImpls] = {
// CHECK-NEXT: nullptr, // RTLIB::Unsupported
// CHECK-NEXT: "___memcpy", // RTLIB::___memcpy
Expand Down Expand Up @@ -236,7 +224,7 @@ def BlahLibrary : SystemRuntimeLibrary<isBlahArch, (add calloc, LibraryWithCondi
// CHECK-EMPTY:
// CHECK-NEXT: return;
// CHECK-NEXT: }
// CHECK-NEXT: initDefaultLibCallImpls();
// CHECK-NEXT: LLVM_DEBUG(dbgs() << "no system runtime library applied to target \'" << TT.str() << "\'\n");
// CHECK-NEXT: }
// CHECK-EMPTY:
// CHECK: #endif
35 changes: 5 additions & 30 deletions llvm/utils/TableGen/Basic/RuntimeLibcallsEmitter.cpp
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Expand Up @@ -307,29 +307,6 @@ void RuntimeLibcallEmitter::emitGetInitRuntimeLibcallNames(
raw_ostream &OS) const {
// TODO: Emit libcall names as string offset table.

OS << "const RTLIB::LibcallImpl "
"llvm::RTLIB::RuntimeLibcallsInfo::"
"DefaultLibcallImpls[RTLIB::UNKNOWN_LIBCALL + 1] = {\n";

for (const RuntimeLibcall &LibCall : RuntimeLibcallDefList) {
auto I = LibCallToDefaultImpl.find(&LibCall);
if (I == LibCallToDefaultImpl.end()) {
OS << " RTLIB::Unsupported,";
} else {
const RuntimeLibcallImpl *LibCallImpl = I->second;
OS << " ";
LibCallImpl->emitEnumEntry(OS);
OS << ',';
}

OS << " // ";
LibCall.emitEnumEntry(OS);
OS << '\n';
}

OS << " RTLIB::Unsupported\n"
"};\n\n";

// Emit the implementation names
OS << "const char *const llvm::RTLIB::RuntimeLibcallsInfo::"
"LibCallImplNames[RTLIB::NumLibcallImpls] = {\n"
Expand Down Expand Up @@ -528,13 +505,11 @@ void RuntimeLibcallEmitter::emitSystemRuntimeLibrarySetCalls(
TopLevelPredicate.emitEndIf(OS);
}

// Fallback to the old default set for manual table entries.
//
// TODO: Remove this when targets have switched to using generated tables by
// default.
OS << " initDefaultLibCallImpls();\n";

OS << "}\n\n";
// FIXME: This should be a fatal error. A few contexts are improperly relying
// on RuntimeLibcalls constructed with fully unknown triples.
OS << " LLVM_DEBUG(dbgs() << \"no system runtime library applied to target "
"\\'\" << TT.str() << \"\\'\\n\");\n"
"}\n\n";
}

void RuntimeLibcallEmitter::run(raw_ostream &OS) {
Expand Down