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Faster crc32 implementation (#1294)

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* Add Pclmulqdq intrinsic

* Implement crc32 in terms of pclmulqdq

* Address PR comments
This commit is contained in:
merry 2020-06-05 11:58:27 +01:00 committed by GitHub
parent bcb7761eac
commit f8cd072b62
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 160 additions and 26 deletions
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8
ARMeilleure/CodeGen/X86/Assembler.cs
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@ -165,6 +165,7 @@ namespace ARMeilleure.CodeGen.X86
Add(X86Instruction.Pavgb, new InstructionInfo(BadOp, BadOp, BadOp, BadOp, 0x00000fe0, InstructionFlags.Vex | InstructionFlags.Prefix66));
Add(X86Instruction.Pavgw, new InstructionInfo(BadOp, BadOp, BadOp, BadOp, 0x00000fe3, InstructionFlags.Vex | InstructionFlags.Prefix66));
Add(X86Instruction.Pblendvb, new InstructionInfo(BadOp, BadOp, BadOp, BadOp, 0x000f3810, InstructionFlags.Prefix66));
Add(X86Instruction.Pclmulqdq, new InstructionInfo(BadOp, BadOp, BadOp, BadOp, 0x000f3a44, InstructionFlags.Vex | InstructionFlags.Prefix66));
Add(X86Instruction.Pcmpeqb, new InstructionInfo(BadOp, BadOp, BadOp, BadOp, 0x00000f74, InstructionFlags.Vex | InstructionFlags.Prefix66));
Add(X86Instruction.Pcmpeqd, new InstructionInfo(BadOp, BadOp, BadOp, BadOp, 0x00000f76, InstructionFlags.Vex | InstructionFlags.Prefix66));
Add(X86Instruction.Pcmpeqq, new InstructionInfo(BadOp, BadOp, BadOp, BadOp, 0x000f3829, InstructionFlags.Vex | InstructionFlags.Prefix66));
@ -633,6 +634,13 @@ namespace ARMeilleure.CodeGen.X86
WriteInstruction(dest, source, type, X86Instruction.Or);
}
public void Pclmulqdq(Operand dest, Operand source, byte imm)
{
WriteInstruction(dest, null, source, X86Instruction.Pclmulqdq);
WriteByte(imm);
}
public void Pcmpeqw(Operand dest, Operand src1, Operand src2)
{
WriteInstruction(dest, src1, src2, X86Instruction.Pcmpeqw);

1
ARMeilleure/CodeGen/X86/IntrinsicTable.cs
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@ -82,6 +82,7 @@ namespace ARMeilleure.CodeGen.X86
Add(Intrinsic.X86Pavgb, new IntrinsicInfo(X86Instruction.Pavgb, IntrinsicType.Binary));
Add(Intrinsic.X86Pavgw, new IntrinsicInfo(X86Instruction.Pavgw, IntrinsicType.Binary));
Add(Intrinsic.X86Pblendvb, new IntrinsicInfo(X86Instruction.Pblendvb, IntrinsicType.Ternary));
Add(Intrinsic.X86Pclmulqdq, new IntrinsicInfo(X86Instruction.Pclmulqdq, IntrinsicType.TernaryImm));
Add(Intrinsic.X86Pcmpeqb, new IntrinsicInfo(X86Instruction.Pcmpeqb, IntrinsicType.Binary));
Add(Intrinsic.X86Pcmpeqd, new IntrinsicInfo(X86Instruction.Pcmpeqd, IntrinsicType.Binary));
Add(Intrinsic.X86Pcmpeqq, new IntrinsicInfo(X86Instruction.Pcmpeqq, IntrinsicType.Binary));

1
ARMeilleure/CodeGen/X86/X86Instruction.cs
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@ -98,6 +98,7 @@ namespace ARMeilleure.CodeGen.X86
Pavgb,
Pavgw,
Pblendvb,
Pclmulqdq,
Pcmpeqb,
Pcmpeqd,
Pcmpeqq,

121
ARMeilleure/Instructions/InstEmitHash.cs
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@ -1,53 +1,174 @@
// https://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-generic-polynomials-pclmulqdq-paper.pdf
using ARMeilleure.Decoders;
using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.Translation;
using System;
using static ARMeilleure.Instructions.InstEmitHelper;
using static ARMeilleure.Instructions.InstEmitSimdHelper;
using static ARMeilleure.IntermediateRepresentation.OperandHelper;
namespace ARMeilleure.Instructions
{
static partial class InstEmit
{
public static void Crc32b(ArmEmitterContext context)
{
if (Optimizations.UsePclmulqdq)
{
EmitCrc32Optimized(context, false, 8);
}
else
{
EmitCrc32Call(context, new _U32_U32_U8(SoftFallback.Crc32b));
}
}
public static void Crc32h(ArmEmitterContext context)
{
if (Optimizations.UsePclmulqdq)
{
EmitCrc32Optimized(context, false, 16);
}
else
{
EmitCrc32Call(context, new _U32_U32_U16(SoftFallback.Crc32h));
}
}
public static void Crc32w(ArmEmitterContext context)
{
if (Optimizations.UsePclmulqdq)
{
EmitCrc32Optimized(context, false, 32);
}
else
{
EmitCrc32Call(context, new _U32_U32_U32(SoftFallback.Crc32w));
}
}
public static void Crc32x(ArmEmitterContext context)
{
if (Optimizations.UsePclmulqdq)
{
EmitCrc32Optimized64(context, false);
}
else
{
EmitCrc32Call(context, new _U32_U32_U64(SoftFallback.Crc32x));
}
}
public static void Crc32cb(ArmEmitterContext context)
{
if (Optimizations.UsePclmulqdq)
{
EmitCrc32Optimized(context, true, 8);
}
else
{
EmitCrc32Call(context, new _U32_U32_U8(SoftFallback.Crc32cb));
}
}
public static void Crc32ch(ArmEmitterContext context)
{
if (Optimizations.UsePclmulqdq)
{
EmitCrc32Optimized(context, true, 16);
}
else
{
EmitCrc32Call(context, new _U32_U32_U16(SoftFallback.Crc32ch));
}
}
public static void Crc32cw(ArmEmitterContext context)
{
if (Optimizations.UsePclmulqdq)
{
EmitCrc32Optimized(context, true, 32);
}
else
{
EmitCrc32Call(context, new _U32_U32_U32(SoftFallback.Crc32cw));
}
}
public static void Crc32cx(ArmEmitterContext context)
{
if (Optimizations.UsePclmulqdq)
{
EmitCrc32Optimized64(context, true);
}
else
{
EmitCrc32Call(context, new _U32_U32_U64(SoftFallback.Crc32cx));
}
}
private static void EmitCrc32Optimized(ArmEmitterContext context, bool castagnoli, int bitsize)
{
OpCodeAluBinary op = (OpCodeAluBinary)context.CurrOp;
long mu = castagnoli ? 0x0DEA713F1 : 0x1F7011641; // mu' = floor(x^64/P(x))'
long polynomial = castagnoli ? 0x105EC76F0 : 0x1DB710641; // P'(x) << 1
Operand crc = GetIntOrZR(context, op.Rn);
Operand data = GetIntOrZR(context, op.Rm);
crc = context.VectorInsert(context.VectorZero(), crc, 0);
switch (bitsize)
{
case 8: data = context.VectorInsert8(context.VectorZero(), data, 0); break;
case 16: data = context.VectorInsert16(context.VectorZero(), data, 0); break;
case 32: data = context.VectorInsert(context.VectorZero(), data, 0); break;
}
Operand tmp = context.AddIntrinsic(Intrinsic.X86Pxor, crc, data);
tmp = context.AddIntrinsic(Intrinsic.X86Psllq, tmp, Const(64 - bitsize));
tmp = context.AddIntrinsic(Intrinsic.X86Pclmulqdq, tmp, X86GetScalar(context, mu), Const(0));
tmp = context.AddIntrinsic(Intrinsic.X86Pclmulqdq, tmp, X86GetScalar(context, polynomial), Const(0));
if (bitsize < 32)
{
crc = context.AddIntrinsic(Intrinsic.X86Pslldq, crc, Const((64 - bitsize) / 8));
tmp = context.AddIntrinsic(Intrinsic.X86Pxor, tmp, crc);
}
SetIntOrZR(context, op.Rd, context.VectorExtract(OperandType.I32, tmp, 2));
}
private static void EmitCrc32Optimized64(ArmEmitterContext context, bool castagnoli)
{
OpCodeAluBinary op = (OpCodeAluBinary)context.CurrOp;
long mu = castagnoli ? 0x0DEA713F1 : 0x1F7011641; // mu' = floor(x^64/P(x))'
long polynomial = castagnoli ? 0x105EC76F0 : 0x1DB710641; // P'(x) << 1
Operand crc = GetIntOrZR(context, op.Rn);
Operand data = GetIntOrZR(context, op.Rm);
crc = context.VectorInsert(context.VectorZero(), crc, 0);
data = context.VectorInsert(context.VectorZero(), data, 0);
Operand tmp = context.AddIntrinsic(Intrinsic.X86Pxor, crc, data);
Operand res = context.AddIntrinsic(Intrinsic.X86Pslldq, tmp, Const(4));
tmp = context.AddIntrinsic(Intrinsic.X86Pclmulqdq, res, X86GetScalar(context, mu), Const(0));
tmp = context.AddIntrinsic(Intrinsic.X86Pclmulqdq, tmp, X86GetScalar(context, polynomial), Const(0));
tmp = context.AddIntrinsic(Intrinsic.X86Pxor, tmp, res);
tmp = context.AddIntrinsic(Intrinsic.X86Psllq, tmp, Const(32));
tmp = context.AddIntrinsic(Intrinsic.X86Pclmulqdq, tmp, X86GetScalar(context, mu), Const(1));
tmp = context.AddIntrinsic(Intrinsic.X86Pclmulqdq, tmp, X86GetScalar(context, polynomial), Const(0));
SetIntOrZR(context, op.Rd, context.VectorExtract(OperandType.I32, tmp, 2));
}
private static void EmitCrc32Call(ArmEmitterContext context, Delegate dlg)
{

1
ARMeilleure/IntermediateRepresentation/Intrinsic.cs
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@ -71,6 +71,7 @@ namespace ARMeilleure.IntermediateRepresentation
X86Pavgb,
X86Pavgw,
X86Pblendvb,
X86Pclmulqdq,
X86Pcmpeqb,
X86Pcmpeqd,
X86Pcmpeqq,

2
ARMeilleure/Optimizations.cs
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@ -17,6 +17,7 @@ namespace ARMeilleure
public static bool UsePopCntIfAvailable { get; set; } = true;
public static bool UseAvxIfAvailable { get; set; } = true;
public static bool UseAesniIfAvailable { get; set; } = true;
public static bool UsePclmulqdqIfAvailable { get; set; } = true;
public static bool ForceLegacySse
{
@ -33,5 +34,6 @@ namespace ARMeilleure
internal static bool UsePopCnt => UsePopCntIfAvailable && HardwareCapabilities.SupportsPopcnt;
internal static bool UseAvx => UseAvxIfAvailable && HardwareCapabilities.SupportsAvx && !ForceLegacySse;
internal static bool UseAesni => UseAesniIfAvailable && HardwareCapabilities.SupportsAesni;
internal static bool UsePclmulqdq => UsePclmulqdqIfAvailable && HardwareCapabilities.SupportsPclmulqdq;
}
}