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