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Implemented fast paths for: (#841)

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* cpu-misc_opt

* B = ~b

* ;
This commit is contained in:
LDj3SNuD 2019-12-07 13:45:32 +01:00 • committed by Ac_K
parent d562ba37a0
commit 8c85bdf2ed
16 changed files with 450 additions and 163 deletions
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97
ARMeilleure/Decoders/DecoderHelper.cs
View file

@ -1,10 +1,77 @@
using ARMeilleure.Common;
using System;
namespace ARMeilleure.Decoders
{
static class DecoderHelper
{
static DecoderHelper()
{
Imm8ToFP32Table = BuildImm8ToFP32Table();
Imm8ToFP64Table = BuildImm8ToFP64Table();
}
public static readonly uint[] Imm8ToFP32Table;
public static readonly ulong[] Imm8ToFP64Table;
private static uint[] BuildImm8ToFP32Table()
{
uint[] tbl = new uint[256];
for (int idx = 0; idx < 256; idx++)
{
tbl[idx] = ExpandImm8ToFP32((uint)idx);
}
return tbl;
}
private static ulong[] BuildImm8ToFP64Table()
{
ulong[] tbl = new ulong[256];
for (int idx = 0; idx < 256; idx++)
{
tbl[idx] = ExpandImm8ToFP64((ulong)idx);
}
return tbl;
}
// abcdefgh -> aBbbbbbc defgh000 00000000 00000000 (B = ~b)
private static uint ExpandImm8ToFP32(uint imm)
{
uint MoveBit(uint bits, int from, int to)
{
return ((bits >> from) & 1U) << to;
}
return MoveBit(imm, 7, 31) | MoveBit(~imm, 6, 30) |
MoveBit(imm, 6, 29) | MoveBit( imm, 6, 28) |
MoveBit(imm, 6, 27) | MoveBit( imm, 6, 26) |
MoveBit(imm, 6, 25) | MoveBit( imm, 5, 24) |
MoveBit(imm, 4, 23) | MoveBit( imm, 3, 22) |
MoveBit(imm, 2, 21) | MoveBit( imm, 1, 20) |
MoveBit(imm, 0, 19);
}
// abcdefgh -> aBbbbbbb bbcdefgh 00000000 00000000 00000000 00000000 00000000 00000000 (B = ~b)
private static ulong ExpandImm8ToFP64(ulong imm)
{
ulong MoveBit(ulong bits, int from, int to)
{
return ((bits >> from) & 1UL) << to;
}
return MoveBit(imm, 7, 63) | MoveBit(~imm, 6, 62) |
MoveBit(imm, 6, 61) | MoveBit( imm, 6, 60) |
MoveBit(imm, 6, 59) | MoveBit( imm, 6, 58) |
MoveBit(imm, 6, 57) | MoveBit( imm, 6, 56) |
MoveBit(imm, 6, 55) | MoveBit( imm, 6, 54) |
MoveBit(imm, 5, 53) | MoveBit( imm, 4, 52) |
MoveBit(imm, 3, 51) | MoveBit( imm, 2, 50) |
MoveBit(imm, 1, 49) | MoveBit( imm, 0, 48);
}
public struct BitMask
{
public long WMask;
@ -62,34 +129,6 @@ namespace ARMeilleure.Decoders
};
}
public static long DecodeImm8Float(long imm, int size)
{
int e = 0, f = 0;
switch (size)
{
case 0: e = 8; f = 23; break;
case 1: e = 11; f = 52; break;
default: throw new ArgumentOutOfRangeException(nameof(size));
}
long value = (imm & 0x3f) << f - 4;
long eBit = (imm >> 6) & 1;
long sBit = (imm >> 7) & 1;
if (eBit != 0)
{
value |= (1L << e - 3) - 1 << f + 2;
}
value |= (eBit ^ 1) << f + e - 1;
value |= sBit << f + e;
return value;
}
public static long DecodeImm24_2(int opCode)
{
return ((long)opCode << 40) >> 38;

17
ARMeilleure/Decoders/OpCodeSimdFmov.cs
View file

@ -8,16 +8,8 @@ namespace ARMeilleure.Decoders
public OpCodeSimdFmov(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode)
{
int imm5 = (opCode >> 5) & 0x1f;
int type = (opCode >> 22) & 0x3;
if (imm5 != 0b00000 || type > 1)
{
Instruction = InstDescriptor.Undefined;
return;
}
Size = type;
long imm;
@ -25,7 +17,14 @@ namespace ARMeilleure.Decoders
Rd = (opCode >> 0) & 0x1f;
imm = (opCode >> 13) & 0xff;
Immediate = DecoderHelper.DecodeImm8Float(imm, type);
if (type == 0)
{
Immediate = (long)DecoderHelper.Imm8ToFP32Table[(int)imm];
}
else /* if (type == 1) */
{
Immediate = (long)DecoderHelper.Imm8ToFP64Table[(int)imm];
}
}
}
}

17
ARMeilleure/Decoders/OpCodeSimdImm.cs
View file

@ -23,19 +23,19 @@ namespace ARMeilleure.Decoders
if (modeHigh == 0b111)
{
Size = modeLow != 0 ? op : 3;
switch (op | (modeLow << 1))
{
case 0:
// 64-bits Immediate.
// Transform abcd efgh into abcd efgh abcd efgh ...
Size = 3;
imm = (long)((ulong)imm * 0x0101010101010101);
break;
case 1:
// 64-bits Immediate.
// Transform abcd efgh into aaaa aaaa bbbb bbbb ...
Size = 3;
imm = (imm & 0xf0) >> 4 | (imm & 0x0f) << 4;
imm = (imm & 0xcc) >> 2 | (imm & 0x33) << 2;
imm = (imm & 0xaa) >> 1 | (imm & 0x55) << 1;
@ -49,9 +49,16 @@ namespace ARMeilleure.Decoders
break;
case 2:
// 2 x 32-bits floating point Immediate.
Size = 0;
imm = (long)DecoderHelper.Imm8ToFP32Table[(int)imm];
imm |= imm << 32;
break;
case 3:
// Floating point Immediate.
imm = DecoderHelper.DecodeImm8Float(imm, Size);
// 64-bits floating point Immediate.
Size = 1;
imm = (long)DecoderHelper.Imm8ToFP64Table[(int)imm];
break;
}
}
@ -72,7 +79,7 @@ namespace ARMeilleure.Decoders
}
else
{
// 8 bits without shift.
// 8-bits without shift.
Size = 0;
}