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X86.td
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//===-- X86.td - Target definition file for the Intel X86 --*- tablegen -*-===//
//
// 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 is a target description file for the Intel i386 architecture, referred
// to here as the "X86" architecture.
//
//===----------------------------------------------------------------------===//
// Get the target-independent interfaces which we are implementing...
//
include "llvm/Target/Target.td"
//===----------------------------------------------------------------------===//
// X86 Subtarget state
//
def Mode64Bit : SubtargetFeature<"64bit-mode", "In64BitMode", "true",
"64-bit mode (x86_64)">;
def Mode32Bit : SubtargetFeature<"32bit-mode", "In32BitMode", "true",
"32-bit mode (80386)">;
def Mode16Bit : SubtargetFeature<"16bit-mode", "In16BitMode", "true",
"16-bit mode (i8086)">;
//===----------------------------------------------------------------------===//
// X86 Subtarget ISA features
//===----------------------------------------------------------------------===//
def FeatureX87 : SubtargetFeature<"x87","HasX87", "true",
"Enable X87 float instructions">;
def FeatureNOPL : SubtargetFeature<"nopl", "HasNOPL", "true",
"Enable NOPL instruction">;
def FeatureCMOV : SubtargetFeature<"cmov","HasCMov", "true",
"Enable conditional move instructions">;
def FeatureCMPXCHG8B : SubtargetFeature<"cx8", "HasCmpxchg8b", "true",
"Support CMPXCHG8B instructions">;
def FeatureCRC32 : SubtargetFeature<"crc32", "HasCRC32", "true",
"Enable SSE 4.2 CRC32 instruction">;
def FeaturePOPCNT : SubtargetFeature<"popcnt", "HasPOPCNT", "true",
"Support POPCNT instruction">;
def FeatureFXSR : SubtargetFeature<"fxsr", "HasFXSR", "true",
"Support fxsave/fxrestore instructions">;
def FeatureXSAVE : SubtargetFeature<"xsave", "HasXSAVE", "true",
"Support xsave instructions">;
def FeatureXSAVEOPT: SubtargetFeature<"xsaveopt", "HasXSAVEOPT", "true",
"Support xsaveopt instructions",
[FeatureXSAVE]>;
def FeatureXSAVEC : SubtargetFeature<"xsavec", "HasXSAVEC", "true",
"Support xsavec instructions",
[FeatureXSAVE]>;
def FeatureXSAVES : SubtargetFeature<"xsaves", "HasXSAVES", "true",
"Support xsaves instructions",
[FeatureXSAVE]>;
def FeatureSSE1 : SubtargetFeature<"sse", "X86SSELevel", "SSE1",
"Enable SSE instructions">;
def FeatureSSE2 : SubtargetFeature<"sse2", "X86SSELevel", "SSE2",
"Enable SSE2 instructions",
[FeatureSSE1]>;
def FeatureSSE3 : SubtargetFeature<"sse3", "X86SSELevel", "SSE3",
"Enable SSE3 instructions",
[FeatureSSE2]>;
def FeatureSSSE3 : SubtargetFeature<"ssse3", "X86SSELevel", "SSSE3",
"Enable SSSE3 instructions",
[FeatureSSE3]>;
def FeatureSSE41 : SubtargetFeature<"sse4.1", "X86SSELevel", "SSE41",
"Enable SSE 4.1 instructions",
[FeatureSSSE3]>;
def FeatureSSE42 : SubtargetFeature<"sse4.2", "X86SSELevel", "SSE42",
"Enable SSE 4.2 instructions",
[FeatureSSE41]>;
// The MMX subtarget feature is separate from the rest of the SSE features
// because it's important (for odd compatibility reasons) to be able to
// turn it off explicitly while allowing SSE+ to be on.
def FeatureMMX : SubtargetFeature<"mmx","X863DNowLevel", "MMX",
"Enable MMX instructions">;
def Feature3DNow : SubtargetFeature<"3dnow", "X863DNowLevel", "ThreeDNow",
"Enable 3DNow! instructions",
[FeatureMMX]>;
def Feature3DNowA : SubtargetFeature<"3dnowa", "X863DNowLevel", "ThreeDNowA",
"Enable 3DNow! Athlon instructions",
[Feature3DNow]>;
// All x86-64 hardware has SSE2, but we don't mark SSE2 as an implied
// feature, because SSE2 can be disabled (e.g. for compiling OS kernels)
// without disabling 64-bit mode. Nothing should imply this feature bit. It
// is used to enforce that only 64-bit capable CPUs are used in 64-bit mode.
def Feature64Bit : SubtargetFeature<"64bit", "HasX86_64", "true",
"Support 64-bit instructions">;
def FeatureCMPXCHG16B : SubtargetFeature<"cx16", "HasCmpxchg16b", "true",
"64-bit with cmpxchg16b",
[FeatureCMPXCHG8B]>;
def FeatureSSE4A : SubtargetFeature<"sse4a", "HasSSE4A", "true",
"Support SSE 4a instructions",
[FeatureSSE3]>;
def FeatureAVX : SubtargetFeature<"avx", "X86SSELevel", "AVX",
"Enable AVX instructions",
[FeatureSSE42]>;
def FeatureAVX2 : SubtargetFeature<"avx2", "X86SSELevel", "AVX2",
"Enable AVX2 instructions",
[FeatureAVX]>;
def FeatureFMA : SubtargetFeature<"fma", "HasFMA", "true",
"Enable three-operand fused multiple-add",
[FeatureAVX]>;
def FeatureF16C : SubtargetFeature<"f16c", "HasF16C", "true",
"Support 16-bit floating point conversion instructions",
[FeatureAVX]>;
def FeatureAVX512 : SubtargetFeature<"avx512f", "X86SSELevel", "AVX512F",
"Enable AVX-512 instructions",
[FeatureAVX2, FeatureFMA, FeatureF16C]>;
def FeatureERI : SubtargetFeature<"avx512er", "HasERI", "true",
"Enable AVX-512 Exponential and Reciprocal Instructions",
[FeatureAVX512]>;
def FeatureCDI : SubtargetFeature<"avx512cd", "HasCDI", "true",
"Enable AVX-512 Conflict Detection Instructions",
[FeatureAVX512]>;
def FeatureVPOPCNTDQ : SubtargetFeature<"avx512vpopcntdq", "HasVPOPCNTDQ",
"true", "Enable AVX-512 Population Count Instructions",
[FeatureAVX512]>;
def FeaturePFI : SubtargetFeature<"avx512pf", "HasPFI", "true",
"Enable AVX-512 PreFetch Instructions",
[FeatureAVX512]>;
def FeaturePREFETCHWT1 : SubtargetFeature<"prefetchwt1", "HasPREFETCHWT1",
"true",
"Prefetch with Intent to Write and T1 Hint">;
def FeatureDQI : SubtargetFeature<"avx512dq", "HasDQI", "true",
"Enable AVX-512 Doubleword and Quadword Instructions",
[FeatureAVX512]>;
def FeatureBWI : SubtargetFeature<"avx512bw", "HasBWI", "true",
"Enable AVX-512 Byte and Word Instructions",
[FeatureAVX512]>;
def FeatureVLX : SubtargetFeature<"avx512vl", "HasVLX", "true",
"Enable AVX-512 Vector Length eXtensions",
[FeatureAVX512]>;
def FeatureVBMI : SubtargetFeature<"avx512vbmi", "HasVBMI", "true",
"Enable AVX-512 Vector Byte Manipulation Instructions",
[FeatureBWI]>;
def FeatureVBMI2 : SubtargetFeature<"avx512vbmi2", "HasVBMI2", "true",
"Enable AVX-512 further Vector Byte Manipulation Instructions",
[FeatureBWI]>;
def FeatureIFMA : SubtargetFeature<"avx512ifma", "HasIFMA", "true",
"Enable AVX-512 Integer Fused Multiple-Add",
[FeatureAVX512]>;
def FeaturePKU : SubtargetFeature<"pku", "HasPKU", "true",
"Enable protection keys">;
def FeatureVNNI : SubtargetFeature<"avx512vnni", "HasVNNI", "true",
"Enable AVX-512 Vector Neural Network Instructions",
[FeatureAVX512]>;
def FeatureAVXVNNI : SubtargetFeature<"avxvnni", "HasAVXVNNI", "true",
"Support AVX_VNNI encoding",
[FeatureAVX2]>;
def FeatureBF16 : SubtargetFeature<"avx512bf16", "HasBF16", "true",
"Support bfloat16 floating point",
[FeatureBWI]>;
def FeatureBITALG : SubtargetFeature<"avx512bitalg", "HasBITALG", "true",
"Enable AVX-512 Bit Algorithms",
[FeatureBWI]>;
def FeatureVP2INTERSECT : SubtargetFeature<"avx512vp2intersect",
"HasVP2INTERSECT", "true",
"Enable AVX-512 vp2intersect",
[FeatureAVX512]>;
// FIXME: FP16 scalar intrinsics use the type v8f16, which is supposed to be
// guarded under condition hasVLX. So we imply it in FeatureFP16 currently.
// FIXME: FP16 conversion between f16 and i64 customize type v8i64, which is
// supposed to be guarded under condition hasDQI. So we imply it in FeatureFP16
// currently.
def FeatureFP16 : SubtargetFeature<"avx512fp16", "HasFP16", "true",
"Support 16-bit floating point",
[FeatureBWI, FeatureVLX, FeatureDQI]>;
def FeaturePCLMUL : SubtargetFeature<"pclmul", "HasPCLMUL", "true",
"Enable packed carry-less multiplication instructions",
[FeatureSSE2]>;
def FeatureGFNI : SubtargetFeature<"gfni", "HasGFNI", "true",
"Enable Galois Field Arithmetic Instructions",
[FeatureSSE2]>;
def FeatureVPCLMULQDQ : SubtargetFeature<"vpclmulqdq", "HasVPCLMULQDQ", "true",
"Enable vpclmulqdq instructions",
[FeatureAVX, FeaturePCLMUL]>;
def FeatureFMA4 : SubtargetFeature<"fma4", "HasFMA4", "true",
"Enable four-operand fused multiple-add",
[FeatureAVX, FeatureSSE4A]>;
def FeatureXOP : SubtargetFeature<"xop", "HasXOP", "true",
"Enable XOP instructions",
[FeatureFMA4]>;
def FeatureSSEUnalignedMem : SubtargetFeature<"sse-unaligned-mem",
"HasSSEUnalignedMem", "true",
"Allow unaligned memory operands with SSE instructions">;
def FeatureAES : SubtargetFeature<"aes", "HasAES", "true",
"Enable AES instructions",
[FeatureSSE2]>;
def FeatureVAES : SubtargetFeature<"vaes", "HasVAES", "true",
"Promote selected AES instructions to AVX512/AVX registers",
[FeatureAVX, FeatureAES]>;
def FeatureTBM : SubtargetFeature<"tbm", "HasTBM", "true",
"Enable TBM instructions">;
def FeatureLWP : SubtargetFeature<"lwp", "HasLWP", "true",
"Enable LWP instructions">;
def FeatureMOVBE : SubtargetFeature<"movbe", "HasMOVBE", "true",
"Support MOVBE instruction">;
def FeatureRDRAND : SubtargetFeature<"rdrnd", "HasRDRAND", "true",
"Support RDRAND instruction">;
def FeatureFSGSBase : SubtargetFeature<"fsgsbase", "HasFSGSBase", "true",
"Support FS/GS Base instructions">;
def FeatureLZCNT : SubtargetFeature<"lzcnt", "HasLZCNT", "true",
"Support LZCNT instruction">;
def FeatureBMI : SubtargetFeature<"bmi", "HasBMI", "true",
"Support BMI instructions">;
def FeatureBMI2 : SubtargetFeature<"bmi2", "HasBMI2", "true",
"Support BMI2 instructions">;
def FeatureRTM : SubtargetFeature<"rtm", "HasRTM", "true",
"Support RTM instructions">;
def FeatureADX : SubtargetFeature<"adx", "HasADX", "true",
"Support ADX instructions">;
def FeatureSHA : SubtargetFeature<"sha", "HasSHA", "true",
"Enable SHA instructions",
[FeatureSSE2]>;
def FeatureSHSTK : SubtargetFeature<"shstk", "HasSHSTK", "true",
"Support CET Shadow-Stack instructions">;
def FeaturePRFCHW : SubtargetFeature<"prfchw", "HasPRFCHW", "true",
"Support PRFCHW instructions">;
def FeatureRDSEED : SubtargetFeature<"rdseed", "HasRDSEED", "true",
"Support RDSEED instruction">;
def FeatureLAHFSAHF : SubtargetFeature<"sahf", "HasLAHFSAHF64", "true",
"Support LAHF and SAHF instructions in 64-bit mode">;
def FeatureMWAITX : SubtargetFeature<"mwaitx", "HasMWAITX", "true",
"Enable MONITORX/MWAITX timer functionality">;
def FeatureCLZERO : SubtargetFeature<"clzero", "HasCLZERO", "true",
"Enable Cache Line Zero">;
def FeatureCLDEMOTE : SubtargetFeature<"cldemote", "HasCLDEMOTE", "true",
"Enable Cache Demote">;
def FeaturePTWRITE : SubtargetFeature<"ptwrite", "HasPTWRITE", "true",
"Support ptwrite instruction">;
def FeatureAMXTILE : SubtargetFeature<"amx-tile", "HasAMXTILE", "true",
"Support AMX-TILE instructions">;
def FeatureAMXINT8 : SubtargetFeature<"amx-int8", "HasAMXINT8", "true",
"Support AMX-INT8 instructions",
[FeatureAMXTILE]>;
def FeatureAMXBF16 : SubtargetFeature<"amx-bf16", "HasAMXBF16", "true",
"Support AMX-BF16 instructions",
[FeatureAMXTILE]>;
def FeatureINVPCID : SubtargetFeature<"invpcid", "HasINVPCID", "true",
"Invalidate Process-Context Identifier">;
def FeatureSGX : SubtargetFeature<"sgx", "HasSGX", "true",
"Enable Software Guard Extensions">;
def FeatureCLFLUSHOPT : SubtargetFeature<"clflushopt", "HasCLFLUSHOPT", "true",
"Flush A Cache Line Optimized">;
def FeatureCLWB : SubtargetFeature<"clwb", "HasCLWB", "true",
"Cache Line Write Back">;
def FeatureWBNOINVD : SubtargetFeature<"wbnoinvd", "HasWBNOINVD", "true",
"Write Back No Invalidate">;
def FeatureRDPID : SubtargetFeature<"rdpid", "HasRDPID", "true",
"Support RDPID instructions">;
def FeatureWAITPKG : SubtargetFeature<"waitpkg", "HasWAITPKG", "true",
"Wait and pause enhancements">;
def FeatureENQCMD : SubtargetFeature<"enqcmd", "HasENQCMD", "true",
"Has ENQCMD instructions">;
def FeatureKL : SubtargetFeature<"kl", "HasKL", "true",
"Support Key Locker kl Instructions",
[FeatureSSE2]>;
def FeatureWIDEKL : SubtargetFeature<"widekl", "HasWIDEKL", "true",
"Support Key Locker wide Instructions",
[FeatureKL]>;
def FeatureHRESET : SubtargetFeature<"hreset", "HasHRESET", "true",
"Has hreset instruction">;
def FeatureSERIALIZE : SubtargetFeature<"serialize", "HasSERIALIZE", "true",
"Has serialize instruction">;
def FeatureTSXLDTRK : SubtargetFeature<"tsxldtrk", "HasTSXLDTRK", "true",
"Support TSXLDTRK instructions">;
def FeatureUINTR : SubtargetFeature<"uintr", "HasUINTR", "true",
"Has UINTR Instructions">;
def FeaturePCONFIG : SubtargetFeature<"pconfig", "HasPCONFIG", "true",
"platform configuration instruction">;
def FeatureMOVDIRI : SubtargetFeature<"movdiri", "HasMOVDIRI", "true",
"Support movdiri instruction">;
def FeatureMOVDIR64B : SubtargetFeature<"movdir64b", "HasMOVDIR64B", "true",
"Support movdir64b instruction">;
// Ivy Bridge and newer processors have enhanced REP MOVSB and STOSB (aka
// "string operations"). See "REP String Enhancement" in the Intel Software
// Development Manual. This feature essentially means that REP MOVSB will copy
// using the largest available size instead of copying bytes one by one, making
// it at least as fast as REPMOVS{W,D,Q}.
def FeatureERMSB
: SubtargetFeature<
"ermsb", "HasERMSB", "true",
"REP MOVS/STOS are fast">;
// Icelake and newer processors have Fast Short REP MOV.
def FeatureFSRM
: SubtargetFeature<
"fsrm", "HasFSRM", "true",
"REP MOVSB of short lengths is faster">;
def FeatureSoftFloat
: SubtargetFeature<"soft-float", "UseSoftFloat", "true",
"Use software floating point features">;
//===----------------------------------------------------------------------===//
// X86 Subtarget Security Mitigation features
//===----------------------------------------------------------------------===//
// Lower indirect calls using a special construct called a `retpoline` to
// mitigate potential Spectre v2 attacks against them.
def FeatureRetpolineIndirectCalls
: SubtargetFeature<
"retpoline-indirect-calls", "UseRetpolineIndirectCalls", "true",
"Remove speculation of indirect calls from the generated code">;
// Lower indirect branches and switches either using conditional branch trees
// or using a special construct called a `retpoline` to mitigate potential
// Spectre v2 attacks against them.
def FeatureRetpolineIndirectBranches
: SubtargetFeature<
"retpoline-indirect-branches", "UseRetpolineIndirectBranches", "true",
"Remove speculation of indirect branches from the generated code">;
// Deprecated umbrella feature for enabling both `retpoline-indirect-calls` and
// `retpoline-indirect-branches` above.
def FeatureRetpoline
: SubtargetFeature<"retpoline", "DeprecatedUseRetpoline", "true",
"Remove speculation of indirect branches from the "
"generated code, either by avoiding them entirely or "
"lowering them with a speculation blocking construct",
[FeatureRetpolineIndirectCalls,
FeatureRetpolineIndirectBranches]>;
// Rely on external thunks for the emitted retpoline calls. This allows users
// to provide their own custom thunk definitions in highly specialized
// environments such as a kernel that does boot-time hot patching.
def FeatureRetpolineExternalThunk
: SubtargetFeature<
"retpoline-external-thunk", "UseRetpolineExternalThunk", "true",
"When lowering an indirect call or branch using a `retpoline`, rely "
"on the specified user provided thunk rather than emitting one "
"ourselves. Only has effect when combined with some other retpoline "
"feature", [FeatureRetpolineIndirectCalls]>;
// Mitigate LVI attacks against indirect calls/branches and call returns
def FeatureLVIControlFlowIntegrity
: SubtargetFeature<
"lvi-cfi", "UseLVIControlFlowIntegrity", "true",
"Prevent indirect calls/branches from using a memory operand, and "
"precede all indirect calls/branches from a register with an "
"LFENCE instruction to serialize control flow. Also decompose RET "
"instructions into a POP+LFENCE+JMP sequence.">;
// Enable SESES to mitigate speculative execution attacks
def FeatureSpeculativeExecutionSideEffectSuppression
: SubtargetFeature<
"seses", "UseSpeculativeExecutionSideEffectSuppression", "true",
"Prevent speculative execution side channel timing attacks by "
"inserting a speculation barrier before memory reads, memory writes, "
"and conditional branches. Implies LVI Control Flow integrity.",
[FeatureLVIControlFlowIntegrity]>;
// Mitigate LVI attacks against data loads
def FeatureLVILoadHardening
: SubtargetFeature<
"lvi-load-hardening", "UseLVILoadHardening", "true",
"Insert LFENCE instructions to prevent data speculatively injected "
"into loads from being used maliciously.">;
def FeatureTaggedGlobals
: SubtargetFeature<
"tagged-globals", "AllowTaggedGlobals", "true",
"Use an instruction sequence for taking the address of a global "
"that allows a memory tag in the upper address bits.">;
//===----------------------------------------------------------------------===//
// X86 Subtarget Tuning features
//===----------------------------------------------------------------------===//
def TuningSlowSHLD : SubtargetFeature<"slow-shld", "IsSHLDSlow", "true",
"SHLD instruction is slow">;
def TuningSlowPMULLD : SubtargetFeature<"slow-pmulld", "IsPMULLDSlow", "true",
"PMULLD instruction is slow">;
def TuningSlowPMADDWD : SubtargetFeature<"slow-pmaddwd", "IsPMADDWDSlow",
"true",
"PMADDWD is slower than PMULLD">;
// FIXME: This should not apply to CPUs that do not have SSE.
def TuningSlowUAMem16 : SubtargetFeature<"slow-unaligned-mem-16",
"IsUAMem16Slow", "true",
"Slow unaligned 16-byte memory access">;
def TuningSlowUAMem32 : SubtargetFeature<"slow-unaligned-mem-32",
"IsUAMem32Slow", "true",
"Slow unaligned 32-byte memory access">;
def TuningLEAForSP : SubtargetFeature<"lea-sp", "UseLeaForSP", "true",
"Use LEA for adjusting the stack pointer">;
def TuningSlowDivide32 : SubtargetFeature<"idivl-to-divb",
"HasSlowDivide32", "true",
"Use 8-bit divide for positive values less than 256">;
def TuningSlowDivide64 : SubtargetFeature<"idivq-to-divl",
"HasSlowDivide64", "true",
"Use 32-bit divide for positive values less than 2^32">;
def TuningPadShortFunctions : SubtargetFeature<"pad-short-functions",
"PadShortFunctions", "true",
"Pad short functions">;
// On some processors, instructions that implicitly take two memory operands are
// slow. In practice, this means that CALL, PUSH, and POP with memory operands
// should be avoided in favor of a MOV + register CALL/PUSH/POP.
def TuningSlowTwoMemOps : SubtargetFeature<"slow-two-mem-ops",
"SlowTwoMemOps", "true",
"Two memory operand instructions are slow">;
def TuningLEAUsesAG : SubtargetFeature<"lea-uses-ag", "LEAUsesAG", "true",
"LEA instruction needs inputs at AG stage">;
def TuningSlowLEA : SubtargetFeature<"slow-lea", "SlowLEA", "true",
"LEA instruction with certain arguments is slow">;
def TuningSlow3OpsLEA : SubtargetFeature<"slow-3ops-lea", "Slow3OpsLEA", "true",
"LEA instruction with 3 ops or certain registers is slow">;
def TuningSlowIncDec : SubtargetFeature<"slow-incdec", "SlowIncDec", "true",
"INC and DEC instructions are slower than ADD and SUB">;
def TuningPOPCNTFalseDeps : SubtargetFeature<"false-deps-popcnt",
"HasPOPCNTFalseDeps", "true",
"POPCNT has a false dependency on dest register">;
def TuningLZCNTFalseDeps : SubtargetFeature<"false-deps-lzcnt-tzcnt",
"HasLZCNTFalseDeps", "true",
"LZCNT/TZCNT have a false dependency on dest register">;
def TuningSBBDepBreaking : SubtargetFeature<"sbb-dep-breaking",
"HasSBBDepBreaking", "true",
"SBB with same register has no source dependency">;
// On recent X86 (port bound) processors, its preferable to combine to a single shuffle
// using a variable mask over multiple fixed shuffles.
def TuningFastVariableCrossLaneShuffle
: SubtargetFeature<"fast-variable-crosslane-shuffle",
"HasFastVariableCrossLaneShuffle",
"true", "Cross-lane shuffles with variable masks are fast">;
def TuningFastVariablePerLaneShuffle
: SubtargetFeature<"fast-variable-perlane-shuffle",
"HasFastVariablePerLaneShuffle",
"true", "Per-lane shuffles with variable masks are fast">;
// On some X86 processors, a vzeroupper instruction should be inserted after
// using ymm/zmm registers before executing code that may use SSE instructions.
def TuningInsertVZEROUPPER
: SubtargetFeature<"vzeroupper",
"InsertVZEROUPPER",
"true", "Should insert vzeroupper instructions">;
// TuningFastScalarFSQRT should be enabled if scalar FSQRT has shorter latency
// than the corresponding NR code. TuningFastVectorFSQRT should be enabled if
// vector FSQRT has higher throughput than the corresponding NR code.
// The idea is that throughput bound code is likely to be vectorized, so for
// vectorized code we should care about the throughput of SQRT operations.
// But if the code is scalar that probably means that the code has some kind of
// dependency and we should care more about reducing the latency.
def TuningFastScalarFSQRT
: SubtargetFeature<"fast-scalar-fsqrt", "HasFastScalarFSQRT",
"true", "Scalar SQRT is fast (disable Newton-Raphson)">;
def TuningFastVectorFSQRT
: SubtargetFeature<"fast-vector-fsqrt", "HasFastVectorFSQRT",
"true", "Vector SQRT is fast (disable Newton-Raphson)">;
// If lzcnt has equivalent latency/throughput to most simple integer ops, it can
// be used to replace test/set sequences.
def TuningFastLZCNT
: SubtargetFeature<
"fast-lzcnt", "HasFastLZCNT", "true",
"LZCNT instructions are as fast as most simple integer ops">;
// If the target can efficiently decode NOPs upto 7-bytes in length.
def TuningFast7ByteNOP
: SubtargetFeature<
"fast-7bytenop", "HasFast7ByteNOP", "true",
"Target can quickly decode up to 7 byte NOPs">;
// If the target can efficiently decode NOPs upto 11-bytes in length.
def TuningFast11ByteNOP
: SubtargetFeature<
"fast-11bytenop", "HasFast11ByteNOP", "true",
"Target can quickly decode up to 11 byte NOPs">;
// If the target can efficiently decode NOPs upto 15-bytes in length.
def TuningFast15ByteNOP
: SubtargetFeature<
"fast-15bytenop", "HasFast15ByteNOP", "true",
"Target can quickly decode up to 15 byte NOPs">;
// Sandy Bridge and newer processors can use SHLD with the same source on both
// inputs to implement rotate to avoid the partial flag update of the normal
// rotate instructions.
def TuningFastSHLDRotate
: SubtargetFeature<
"fast-shld-rotate", "HasFastSHLDRotate", "true",
"SHLD can be used as a faster rotate">;
// Bulldozer and newer processors can merge CMP/TEST (but not other
// instructions) with conditional branches.
def TuningBranchFusion
: SubtargetFeature<"branchfusion", "HasBranchFusion", "true",
"CMP/TEST can be fused with conditional branches">;
// Sandy Bridge and newer processors have many instructions that can be
// fused with conditional branches and pass through the CPU as a single
// operation.
def TuningMacroFusion
: SubtargetFeature<"macrofusion", "HasMacroFusion", "true",
"Various instructions can be fused with conditional branches">;
// Gather is available since Haswell (AVX2 set). So technically, we can
// generate Gathers on all AVX2 processors. But the overhead on HSW is high.
// Skylake Client processor has faster Gathers than HSW and performance is
// similar to Skylake Server (AVX-512).
def TuningFastGather
: SubtargetFeature<"fast-gather", "HasFastGather", "true",
"Indicates if gather is reasonably fast">;
def TuningPrefer128Bit
: SubtargetFeature<"prefer-128-bit", "Prefer128Bit", "true",
"Prefer 128-bit AVX instructions">;
def TuningPrefer256Bit
: SubtargetFeature<"prefer-256-bit", "Prefer256Bit", "true",
"Prefer 256-bit AVX instructions">;
def TuningPreferMaskRegisters
: SubtargetFeature<"prefer-mask-registers", "PreferMaskRegisters", "true",
"Prefer AVX512 mask registers over PTEST/MOVMSK">;
def TuningFastBEXTR : SubtargetFeature<"fast-bextr", "HasFastBEXTR", "true",
"Indicates that the BEXTR instruction is implemented as a single uop "
"with good throughput">;
// Combine vector math operations with shuffles into horizontal math
// instructions if a CPU implements horizontal operations (introduced with
// SSE3) with better latency/throughput than the alternative sequence.
def TuningFastHorizontalOps
: SubtargetFeature<
"fast-hops", "HasFastHorizontalOps", "true",
"Prefer horizontal vector math instructions (haddp, phsub, etc.) over "
"normal vector instructions with shuffles">;
def TuningFastScalarShiftMasks
: SubtargetFeature<
"fast-scalar-shift-masks", "HasFastScalarShiftMasks", "true",
"Prefer a left/right scalar logical shift pair over a shift+and pair">;
def TuningFastVectorShiftMasks
: SubtargetFeature<
"fast-vector-shift-masks", "HasFastVectorShiftMasks", "true",
"Prefer a left/right vector logical shift pair over a shift+and pair">;
def TuningFastMOVBE
: SubtargetFeature<"fast-movbe", "HasFastMOVBE", "true",
"Prefer a movbe over a single-use load + bswap / single-use bswap + store">;
def TuningUseSLMArithCosts
: SubtargetFeature<"use-slm-arith-costs", "UseSLMArithCosts", "true",
"Use Silvermont specific arithmetic costs">;
def TuningUseGLMDivSqrtCosts
: SubtargetFeature<"use-glm-div-sqrt-costs", "UseGLMDivSqrtCosts", "true",
"Use Goldmont specific floating point div/sqrt costs">;
// Enable use of alias analysis during code generation.
def FeatureUseAA : SubtargetFeature<"use-aa", "UseAA", "true",
"Use alias analysis during codegen">;
//===----------------------------------------------------------------------===//
// X86 CPU Families
// TODO: Remove these - use general tuning features to determine codegen.
//===----------------------------------------------------------------------===//
// Bonnell
def ProcIntelAtom : SubtargetFeature<"", "X86ProcFamily", "IntelAtom", "">;
//===----------------------------------------------------------------------===//
// Register File Description
//===----------------------------------------------------------------------===//
include "X86RegisterInfo.td"
include "X86RegisterBanks.td"
//===----------------------------------------------------------------------===//
// Instruction Descriptions
//===----------------------------------------------------------------------===//
include "X86Schedule.td"
include "X86InstrInfo.td"
include "X86SchedPredicates.td"
def X86InstrInfo : InstrInfo;
//===----------------------------------------------------------------------===//
// X86 Scheduler Models
//===----------------------------------------------------------------------===//
include "X86ScheduleAtom.td"
include "X86SchedSandyBridge.td"
include "X86SchedHaswell.td"
include "X86SchedBroadwell.td"
include "X86ScheduleSLM.td"
include "X86ScheduleZnver1.td"
include "X86ScheduleZnver2.td"
include "X86ScheduleZnver3.td"
include "X86ScheduleBdVer2.td"
include "X86ScheduleBtVer2.td"
include "X86SchedSkylakeClient.td"
include "X86SchedSkylakeServer.td"
include "X86SchedIceLake.td"
//===----------------------------------------------------------------------===//
// X86 Processor Feature Lists
//===----------------------------------------------------------------------===//
def ProcessorFeatures {
// x86-64 and x86-64-v[234]
list<SubtargetFeature> X86_64V1Features = [
FeatureX87, FeatureCMPXCHG8B, FeatureCMOV, FeatureMMX, FeatureSSE2,
FeatureFXSR, FeatureNOPL, Feature64Bit
];
list<SubtargetFeature> X86_64V2Features = !listconcat(X86_64V1Features, [
FeatureCMPXCHG16B, FeatureLAHFSAHF, FeatureCRC32, FeaturePOPCNT,
FeatureSSE42
]);
list<SubtargetFeature> X86_64V3Features = !listconcat(X86_64V2Features, [
FeatureAVX2, FeatureBMI, FeatureBMI2, FeatureF16C, FeatureFMA, FeatureLZCNT,
FeatureMOVBE, FeatureXSAVE
]);
list<SubtargetFeature> X86_64V4Features = !listconcat(X86_64V3Features, [
FeatureBWI,
FeatureCDI,
FeatureDQI,
FeatureVLX,
]);
// Nehalem
list<SubtargetFeature> NHMFeatures = X86_64V2Features;
list<SubtargetFeature> NHMTuning = [TuningMacroFusion,
TuningInsertVZEROUPPER];
// Westmere
list<SubtargetFeature> WSMAdditionalFeatures = [FeaturePCLMUL];
list<SubtargetFeature> WSMTuning = NHMTuning;
list<SubtargetFeature> WSMFeatures =
!listconcat(NHMFeatures, WSMAdditionalFeatures);
// Sandybridge
list<SubtargetFeature> SNBAdditionalFeatures = [FeatureAVX,
FeatureXSAVE,
FeatureXSAVEOPT];
list<SubtargetFeature> SNBTuning = [TuningMacroFusion,
TuningSlow3OpsLEA,
TuningSlowDivide64,
TuningSlowUAMem32,
TuningFastScalarFSQRT,
TuningFastSHLDRotate,
TuningFast15ByteNOP,
TuningPOPCNTFalseDeps,
TuningInsertVZEROUPPER];
list<SubtargetFeature> SNBFeatures =
!listconcat(WSMFeatures, SNBAdditionalFeatures);
// Ivybridge
list<SubtargetFeature> IVBAdditionalFeatures = [FeatureRDRAND,
FeatureF16C,
FeatureFSGSBase];
list<SubtargetFeature> IVBTuning = SNBTuning;
list<SubtargetFeature> IVBFeatures =
!listconcat(SNBFeatures, IVBAdditionalFeatures);
// Haswell
list<SubtargetFeature> HSWAdditionalFeatures = [FeatureAVX2,
FeatureBMI,
FeatureBMI2,
FeatureERMSB,
FeatureFMA,
FeatureINVPCID,
FeatureLZCNT,
FeatureMOVBE];
list<SubtargetFeature> HSWTuning = [TuningMacroFusion,
TuningSlow3OpsLEA,
TuningSlowDivide64,
TuningFastScalarFSQRT,
TuningFastSHLDRotate,
TuningFast15ByteNOP,
TuningFastVariableCrossLaneShuffle,
TuningFastVariablePerLaneShuffle,
TuningPOPCNTFalseDeps,
TuningLZCNTFalseDeps,
TuningInsertVZEROUPPER];
list<SubtargetFeature> HSWFeatures =
!listconcat(IVBFeatures, HSWAdditionalFeatures);
// Broadwell
list<SubtargetFeature> BDWAdditionalFeatures = [FeatureADX,
FeatureRDSEED,
FeaturePRFCHW];
list<SubtargetFeature> BDWTuning = HSWTuning;
list<SubtargetFeature> BDWFeatures =
!listconcat(HSWFeatures, BDWAdditionalFeatures);
// Skylake
list<SubtargetFeature> SKLAdditionalFeatures = [FeatureAES,
FeatureXSAVEC,
FeatureXSAVES,
FeatureCLFLUSHOPT];
list<SubtargetFeature> SKLTuning = [TuningFastGather,
TuningMacroFusion,
TuningSlow3OpsLEA,
TuningSlowDivide64,
TuningFastScalarFSQRT,
TuningFastVectorFSQRT,
TuningFastSHLDRotate,
TuningFast15ByteNOP,
TuningFastVariableCrossLaneShuffle,
TuningFastVariablePerLaneShuffle,
TuningPOPCNTFalseDeps,
TuningInsertVZEROUPPER];
list<SubtargetFeature> SKLFeatures =
!listconcat(BDWFeatures, SKLAdditionalFeatures);
// Skylake-AVX512
list<SubtargetFeature> SKXAdditionalFeatures = [FeatureAES,
FeatureXSAVEC,
FeatureXSAVES,
FeatureCLFLUSHOPT,
FeatureAVX512,
FeatureCDI,
FeatureDQI,
FeatureBWI,
FeatureVLX,
FeaturePKU,
FeatureCLWB];
list<SubtargetFeature> SKXTuning = [TuningFastGather,
TuningMacroFusion,
TuningSlow3OpsLEA,
TuningSlowDivide64,
TuningFastScalarFSQRT,
TuningFastVectorFSQRT,
TuningFastSHLDRotate,
TuningFast15ByteNOP,
TuningFastVariableCrossLaneShuffle,
TuningFastVariablePerLaneShuffle,
TuningPrefer256Bit,
TuningPOPCNTFalseDeps,
TuningInsertVZEROUPPER];
list<SubtargetFeature> SKXFeatures =
!listconcat(BDWFeatures, SKXAdditionalFeatures);
// Cascadelake
list<SubtargetFeature> CLXAdditionalFeatures = [FeatureVNNI];
list<SubtargetFeature> CLXTuning = SKXTuning;
list<SubtargetFeature> CLXFeatures =
!listconcat(SKXFeatures, CLXAdditionalFeatures);
// Cooperlake
list<SubtargetFeature> CPXAdditionalFeatures = [FeatureBF16];
list<SubtargetFeature> CPXTuning = SKXTuning;
list<SubtargetFeature> CPXFeatures =
!listconcat(CLXFeatures, CPXAdditionalFeatures);
// Cannonlake
list<SubtargetFeature> CNLAdditionalFeatures = [FeatureAVX512,
FeatureCDI,
FeatureDQI,
FeatureBWI,
FeatureVLX,
FeaturePKU,
FeatureVBMI,
FeatureIFMA,
FeatureSHA];
list<SubtargetFeature> CNLTuning = [TuningFastGather,
TuningMacroFusion,
TuningSlow3OpsLEA,
TuningSlowDivide64,
TuningFastScalarFSQRT,
TuningFastVectorFSQRT,
TuningFastSHLDRotate,
TuningFast15ByteNOP,
TuningFastVariableCrossLaneShuffle,
TuningFastVariablePerLaneShuffle,
TuningPrefer256Bit,
TuningInsertVZEROUPPER];
list<SubtargetFeature> CNLFeatures =
!listconcat(SKLFeatures, CNLAdditionalFeatures);
// Icelake
list<SubtargetFeature> ICLAdditionalFeatures = [FeatureBITALG,
FeatureVAES,
FeatureVBMI2,
FeatureVNNI,
FeatureVPCLMULQDQ,
FeatureVPOPCNTDQ,
FeatureGFNI,
FeatureRDPID,
FeatureFSRM];
list<SubtargetFeature> ICLTuning = [TuningFastGather,
TuningMacroFusion,
TuningSlow3OpsLEA,
TuningSlowDivide64,
TuningFastScalarFSQRT,
TuningFastVectorFSQRT,
TuningFastSHLDRotate,
TuningFast15ByteNOP,
TuningFastVariableCrossLaneShuffle,
TuningFastVariablePerLaneShuffle,
TuningPrefer256Bit,
TuningInsertVZEROUPPER];
list<SubtargetFeature> ICLFeatures =
!listconcat(CNLFeatures, ICLAdditionalFeatures);
// Icelake Server
list<SubtargetFeature> ICXAdditionalFeatures = [FeaturePCONFIG,
FeatureCLWB,
FeatureWBNOINVD];
list<SubtargetFeature> ICXTuning = ICLTuning;
list<SubtargetFeature> ICXFeatures =
!listconcat(ICLFeatures, ICXAdditionalFeatures);
// Tigerlake
list<SubtargetFeature> TGLAdditionalFeatures = [FeatureVP2INTERSECT,
FeatureCLWB,
FeatureMOVDIRI,
FeatureMOVDIR64B,
FeatureSHSTK];
list<SubtargetFeature> TGLTuning = ICLTuning;
list<SubtargetFeature> TGLFeatures =
!listconcat(ICLFeatures, TGLAdditionalFeatures );
// Sapphirerapids
list<SubtargetFeature> SPRAdditionalFeatures = [FeatureAMXTILE,
FeatureAMXINT8,
FeatureAMXBF16,
FeatureBF16,
FeatureSERIALIZE,
FeatureCLDEMOTE,
FeatureWAITPKG,
FeaturePTWRITE,
FeatureFP16,
FeatureAVXVNNI,
FeatureTSXLDTRK,
FeatureENQCMD,
FeatureSHSTK,
FeatureVP2INTERSECT,
FeatureMOVDIRI,
FeatureMOVDIR64B,
FeatureUINTR];
list<SubtargetFeature> SPRTuning = ICXTuning;
list<SubtargetFeature> SPRFeatures =
!listconcat(ICXFeatures, SPRAdditionalFeatures);
// Atom
list<SubtargetFeature> AtomFeatures = [FeatureX87,
FeatureCMPXCHG8B,
FeatureCMOV,
FeatureMMX,
FeatureSSSE3,
FeatureFXSR,
FeatureNOPL,
Feature64Bit,
FeatureCMPXCHG16B,
FeatureMOVBE,
FeatureLAHFSAHF];
list<SubtargetFeature> AtomTuning = [ProcIntelAtom,
TuningSlowUAMem16,
TuningLEAForSP,
TuningSlowDivide32,
TuningSlowDivide64,
TuningSlowTwoMemOps,
TuningLEAUsesAG,
TuningPadShortFunctions,
TuningInsertVZEROUPPER];
// Silvermont
list<SubtargetFeature> SLMAdditionalFeatures = [FeatureSSE42,
FeatureCRC32,
FeaturePOPCNT,
FeaturePCLMUL,
FeaturePRFCHW,
FeatureRDRAND];
list<SubtargetFeature> SLMTuning = [TuningUseSLMArithCosts,
TuningSlowTwoMemOps,
TuningSlowLEA,
TuningSlowIncDec,
TuningSlowDivide64,
TuningSlowPMULLD,
TuningFast7ByteNOP,
TuningFastMOVBE,
TuningPOPCNTFalseDeps,
TuningInsertVZEROUPPER];
list<SubtargetFeature> SLMFeatures =
!listconcat(AtomFeatures, SLMAdditionalFeatures);
// Goldmont
list<SubtargetFeature> GLMAdditionalFeatures = [FeatureAES,
FeatureSHA,
FeatureRDSEED,
FeatureXSAVE,
FeatureXSAVEOPT,
FeatureXSAVEC,
FeatureXSAVES,
FeatureCLFLUSHOPT,
FeatureFSGSBase];
list<SubtargetFeature> GLMTuning = [TuningUseGLMDivSqrtCosts,
TuningSlowTwoMemOps,
TuningSlowLEA,
TuningSlowIncDec,
TuningFastMOVBE,
TuningPOPCNTFalseDeps,
TuningInsertVZEROUPPER];
list<SubtargetFeature> GLMFeatures =
!listconcat(SLMFeatures, GLMAdditionalFeatures);
// Goldmont Plus
list<SubtargetFeature> GLPAdditionalFeatures = [FeaturePTWRITE,
FeatureRDPID];
list<SubtargetFeature> GLPTuning = [TuningUseGLMDivSqrtCosts,
TuningSlowTwoMemOps,
TuningSlowLEA,
TuningSlowIncDec,
TuningFastMOVBE,
TuningInsertVZEROUPPER];
list<SubtargetFeature> GLPFeatures =
!listconcat(GLMFeatures, GLPAdditionalFeatures);
// Tremont
list<SubtargetFeature> TRMAdditionalFeatures = [FeatureCLWB,
FeatureGFNI];
list<SubtargetFeature> TRMTuning = GLPTuning;
list<SubtargetFeature> TRMFeatures =
!listconcat(GLPFeatures, TRMAdditionalFeatures);
// Alderlake
list<SubtargetFeature> ADLAdditionalFeatures = [FeatureSERIALIZE,
FeaturePCONFIG,
FeatureSHSTK,
FeatureWIDEKL,
FeatureINVPCID,
FeatureADX,
FeatureFMA,
FeatureVAES,
FeatureVPCLMULQDQ,
FeatureF16C,
FeatureBMI,
FeatureBMI2,
FeatureLZCNT,
FeatureAVXVNNI,
FeaturePKU,
FeatureHRESET,
FeatureCLDEMOTE,
FeatureMOVDIRI,
FeatureMOVDIR64B,
FeatureWAITPKG];
list<SubtargetFeature> ADLTuning = SKLTuning;
list<SubtargetFeature> ADLFeatures =
!listconcat(TRMFeatures, ADLAdditionalFeatures);
// Knights Landing
list<SubtargetFeature> KNLFeatures = [FeatureX87,
FeatureCMPXCHG8B,
FeatureCMOV,
FeatureMMX,
FeatureFXSR,
FeatureNOPL,
Feature64Bit,
FeatureCMPXCHG16B,
FeatureCRC32,
FeaturePOPCNT,
FeaturePCLMUL,
FeatureXSAVE,
FeatureXSAVEOPT,
FeatureLAHFSAHF,
FeatureAES,
FeatureRDRAND,
FeatureF16C,
FeatureFSGSBase,
FeatureAVX512,
FeatureERI,
FeatureCDI,