179 lines
6.9 KiB
C++
179 lines
6.9 KiB
C++
//===-- X86InstrFMA3Info.cpp - X86 FMA3 Instruction Information -----------===//
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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 contains the implementation of the classes providing information
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// about existing X86 FMA3 opcodes, classifying and grouping them.
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//
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//===----------------------------------------------------------------------===//
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#include "X86InstrFMA3Info.h"
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#include "X86InstrInfo.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/Threading.h"
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#include <cassert>
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#include <cstdint>
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using namespace llvm;
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#define FMA3GROUP(Name, Suf, Attrs) \
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{ { X86::Name##132##Suf, X86::Name##213##Suf, X86::Name##231##Suf }, Attrs },
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#define FMA3GROUP_MASKED(Name, Suf, Attrs) \
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FMA3GROUP(Name, Suf, Attrs) \
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FMA3GROUP(Name, Suf##k, Attrs | X86InstrFMA3Group::KMergeMasked) \
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FMA3GROUP(Name, Suf##kz, Attrs | X86InstrFMA3Group::KZeroMasked)
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#define FMA3GROUP_PACKED_WIDTHS_Z(Name, Suf, Attrs) \
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FMA3GROUP_MASKED(Name, Suf##Z128m, Attrs) \
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FMA3GROUP_MASKED(Name, Suf##Z128r, Attrs) \
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FMA3GROUP_MASKED(Name, Suf##Z256m, Attrs) \
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FMA3GROUP_MASKED(Name, Suf##Z256r, Attrs) \
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FMA3GROUP_MASKED(Name, Suf##Zm, Attrs) \
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FMA3GROUP_MASKED(Name, Suf##Zr, Attrs) \
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#define FMA3GROUP_PACKED_WIDTHS_ALL(Name, Suf, Attrs) \
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FMA3GROUP(Name, Suf##Ym, Attrs) \
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FMA3GROUP(Name, Suf##Yr, Attrs) \
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FMA3GROUP_PACKED_WIDTHS_Z(Name, Suf, Attrs) \
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FMA3GROUP(Name, Suf##m, Attrs) \
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FMA3GROUP(Name, Suf##r, Attrs)
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#define FMA3GROUP_PACKED(Name, Attrs) \
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FMA3GROUP_PACKED_WIDTHS_ALL(Name, PD, Attrs) \
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FMA3GROUP_PACKED_WIDTHS_Z(Name, PH, Attrs) \
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FMA3GROUP_PACKED_WIDTHS_ALL(Name, PS, Attrs)
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#define FMA3GROUP_SCALAR_WIDTHS_Z(Name, Suf, Attrs) \
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FMA3GROUP(Name, Suf##Zm, Attrs) \
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FMA3GROUP_MASKED(Name, Suf##Zm_Int, Attrs | X86InstrFMA3Group::Intrinsic) \
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FMA3GROUP(Name, Suf##Zr, Attrs) \
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FMA3GROUP_MASKED(Name, Suf##Zr_Int, Attrs | X86InstrFMA3Group::Intrinsic) \
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#define FMA3GROUP_SCALAR_WIDTHS_ALL(Name, Suf, Attrs) \
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FMA3GROUP_SCALAR_WIDTHS_Z(Name, Suf, Attrs) \
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FMA3GROUP(Name, Suf##m, Attrs) \
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FMA3GROUP(Name, Suf##m_Int, Attrs | X86InstrFMA3Group::Intrinsic) \
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FMA3GROUP(Name, Suf##r, Attrs) \
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FMA3GROUP(Name, Suf##r_Int, Attrs | X86InstrFMA3Group::Intrinsic)
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#define FMA3GROUP_SCALAR(Name, Attrs) \
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FMA3GROUP_SCALAR_WIDTHS_ALL(Name, SD, Attrs) \
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FMA3GROUP_SCALAR_WIDTHS_Z(Name, SH, Attrs) \
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FMA3GROUP_SCALAR_WIDTHS_ALL(Name, SS, Attrs)
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#define FMA3GROUP_FULL(Name, Attrs) \
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FMA3GROUP_PACKED(Name, Attrs) \
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FMA3GROUP_SCALAR(Name, Attrs)
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static const X86InstrFMA3Group Groups[] = {
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FMA3GROUP_FULL(VFMADD, 0)
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FMA3GROUP_PACKED(VFMADDSUB, 0)
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FMA3GROUP_FULL(VFMSUB, 0)
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FMA3GROUP_PACKED(VFMSUBADD, 0)
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FMA3GROUP_FULL(VFNMADD, 0)
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FMA3GROUP_FULL(VFNMSUB, 0)
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};
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#define FMA3GROUP_PACKED_AVX512_WIDTHS(Name, Type, Suf, Attrs) \
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FMA3GROUP_MASKED(Name, Type##Z128##Suf, Attrs) \
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FMA3GROUP_MASKED(Name, Type##Z256##Suf, Attrs) \
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FMA3GROUP_MASKED(Name, Type##Z##Suf, Attrs)
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#define FMA3GROUP_PACKED_AVX512(Name, Suf, Attrs) \
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FMA3GROUP_PACKED_AVX512_WIDTHS(Name, PD, Suf, Attrs) \
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FMA3GROUP_PACKED_AVX512_WIDTHS(Name, PH, Suf, Attrs) \
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FMA3GROUP_PACKED_AVX512_WIDTHS(Name, PS, Suf, Attrs)
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#define FMA3GROUP_PACKED_AVX512_ROUND(Name, Suf, Attrs) \
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FMA3GROUP_MASKED(Name, PDZ##Suf, Attrs) \
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FMA3GROUP_MASKED(Name, PHZ##Suf, Attrs) \
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FMA3GROUP_MASKED(Name, PSZ##Suf, Attrs)
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#define FMA3GROUP_SCALAR_AVX512_ROUND(Name, Suf, Attrs) \
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FMA3GROUP(Name, SDZ##Suf, Attrs) \
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FMA3GROUP_MASKED(Name, SDZ##Suf##_Int, Attrs) \
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FMA3GROUP(Name, SHZ##Suf, Attrs) \
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FMA3GROUP_MASKED(Name, SHZ##Suf##_Int, Attrs) \
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FMA3GROUP(Name, SSZ##Suf, Attrs) \
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FMA3GROUP_MASKED(Name, SSZ##Suf##_Int, Attrs)
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static const X86InstrFMA3Group BroadcastGroups[] = {
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FMA3GROUP_PACKED_AVX512(VFMADD, mb, 0)
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FMA3GROUP_PACKED_AVX512(VFMADDSUB, mb, 0)
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FMA3GROUP_PACKED_AVX512(VFMSUB, mb, 0)
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FMA3GROUP_PACKED_AVX512(VFMSUBADD, mb, 0)
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FMA3GROUP_PACKED_AVX512(VFNMADD, mb, 0)
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FMA3GROUP_PACKED_AVX512(VFNMSUB, mb, 0)
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};
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static const X86InstrFMA3Group RoundGroups[] = {
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FMA3GROUP_PACKED_AVX512_ROUND(VFMADD, rb, 0)
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FMA3GROUP_SCALAR_AVX512_ROUND(VFMADD, rb, X86InstrFMA3Group::Intrinsic)
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FMA3GROUP_PACKED_AVX512_ROUND(VFMADDSUB, rb, 0)
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FMA3GROUP_PACKED_AVX512_ROUND(VFMSUB, rb, 0)
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FMA3GROUP_SCALAR_AVX512_ROUND(VFMSUB, rb, X86InstrFMA3Group::Intrinsic)
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FMA3GROUP_PACKED_AVX512_ROUND(VFMSUBADD, rb, 0)
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FMA3GROUP_PACKED_AVX512_ROUND(VFNMADD, rb, 0)
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FMA3GROUP_SCALAR_AVX512_ROUND(VFNMADD, rb, X86InstrFMA3Group::Intrinsic)
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FMA3GROUP_PACKED_AVX512_ROUND(VFNMSUB, rb, 0)
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FMA3GROUP_SCALAR_AVX512_ROUND(VFNMSUB, rb, X86InstrFMA3Group::Intrinsic)
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};
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static void verifyTables() {
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#ifndef NDEBUG
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static std::atomic<bool> TableChecked(false);
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if (!TableChecked.load(std::memory_order_relaxed)) {
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assert(llvm::is_sorted(Groups) && llvm::is_sorted(RoundGroups) &&
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llvm::is_sorted(BroadcastGroups) && "FMA3 tables not sorted!");
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TableChecked.store(true, std::memory_order_relaxed);
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}
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#endif
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}
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/// Returns a reference to a group of FMA3 opcodes to where the given
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/// \p Opcode is included. If the given \p Opcode is not recognized as FMA3
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/// and not included into any FMA3 group, then nullptr is returned.
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const X86InstrFMA3Group *llvm::getFMA3Group(unsigned Opcode, uint64_t TSFlags) {
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// FMA3 instructions have a well defined encoding pattern we can exploit.
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uint8_t BaseOpcode = X86II::getBaseOpcodeFor(TSFlags);
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bool IsFMA3Opcode = ((BaseOpcode >= 0x96 && BaseOpcode <= 0x9F) ||
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(BaseOpcode >= 0xA6 && BaseOpcode <= 0xAF) ||
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(BaseOpcode >= 0xB6 && BaseOpcode <= 0xBF));
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bool IsFMA3Encoding = ((TSFlags & X86II::EncodingMask) == X86II::VEX &&
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(TSFlags & X86II::OpMapMask) == X86II::T8) ||
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((TSFlags & X86II::EncodingMask) == X86II::EVEX &&
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((TSFlags & X86II::OpMapMask) == X86II::T8 ||
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(TSFlags & X86II::OpMapMask) == X86II::T_MAP6));
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bool IsFMA3Prefix = (TSFlags & X86II::OpPrefixMask) == X86II::PD;
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if (!IsFMA3Opcode || !IsFMA3Encoding || !IsFMA3Prefix)
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return nullptr;
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verifyTables();
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ArrayRef<X86InstrFMA3Group> Table;
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if (TSFlags & X86II::EVEX_RC)
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Table = makeArrayRef(RoundGroups);
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else if (TSFlags & X86II::EVEX_B)
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Table = makeArrayRef(BroadcastGroups);
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else
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Table = makeArrayRef(Groups);
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// FMA 132 instructions have an opcode of 0x96-0x9F
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// FMA 213 instructions have an opcode of 0xA6-0xAF
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// FMA 231 instructions have an opcode of 0xB6-0xBF
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unsigned FormIndex = ((BaseOpcode - 0x90) >> 4) & 0x3;
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auto I = partition_point(Table, [=](const X86InstrFMA3Group &Group) {
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return Group.Opcodes[FormIndex] < Opcode;
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});
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assert(I != Table.end() && I->Opcodes[FormIndex] == Opcode &&
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"Couldn't find FMA3 opcode!");
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return I;
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}
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