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Revert "ARMeilleure: Add initial support for AVX512(EVEX encoding) (#3663)" (#4145)

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This reverts commit 295fbd0542.
This commit is contained in:
gdkchan 2022-12-18 20:21:10 -03:00 • committed by GitHub
parent 295fbd0542
commit f93c5f006a
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10 changed files with 9 additions and 193 deletions
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105
ARMeilleure/CodeGen/X86/Assembler.cs
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@ -1033,13 +1033,7 @@ namespace ARMeilleure.CodeGen.X86
Debug.Assert(opCode != BadOp, "Invalid opcode value.");
if ((flags & InstructionFlags.Evex) != 0 && HardwareCapabilities.SupportsEvexEncoding)
{
WriteEvexInst(dest, src1, src2, type, flags, opCode);
opCode &= 0xff;
}
else if ((flags & InstructionFlags.Vex) != 0 && HardwareCapabilities.SupportsVexEncoding)
if ((flags & InstructionFlags.Vex) != 0 && HardwareCapabilities.SupportsVexEncoding)
{
// In a vex encoding, only one prefix can be active at a time. The active prefix is encoded in the second byte using two bits.
@ -1158,103 +1152,6 @@ namespace ARMeilleure.CodeGen.X86
}
}
private void WriteEvexInst(
Operand dest,
Operand src1,
Operand src2,
OperandType type,
InstructionFlags flags,
int opCode,
bool broadcast = false,
int registerWidth = 128,
int maskRegisterIdx = 0,
bool zeroElements = false)
{
int destIdx = dest.GetRegister().Index;
int src1Idx = src1.GetRegister().Index;
int src2Idx = src2.GetRegister().Index;
WriteByte(0x62);
// P0
// Extend dest register
bool r = (destIdx & 8) == 0;
// Extend src register
bool x = (src1Idx & 16) == 0;
// Extend src register
bool b = (src1Idx & 8) == 0;
// Extend dest register
bool rp = (destIdx & 16) == 0;
// Escape code index
byte mm = 0b00;
switch ((ushort)(opCode >> 8))
{
case 0xf00: mm = 0b01; break;
case 0xf38: mm = 0b10; break;
case 0xf3a: mm = 0b11; break;
default: Debug.Assert(false, $"Failed to EVEX encode opcode 0x{opCode:X}."); break;
}
WriteByte(
(byte)(
(r ? 0x80 : 0) |
(x ? 0x40 : 0) |
(b ? 0x20 : 0) |
(rp ? 0x10 : 0) |
mm));
// P1
// Specify 64-bit lane mode
bool w = Is64Bits(type);
// Src2 register index
byte vvvv = (byte)(src2Idx & 0b1111);
// Opcode prefix
byte pp = (flags & InstructionFlags.PrefixMask) switch
{
InstructionFlags.Prefix66 => 0b01,
InstructionFlags.PrefixF3 => 0b10,
InstructionFlags.PrefixF2 => 0b11,
_ => 0
};
WriteByte(
(byte)(
(w ? 0x80 : 0) |
(vvvv << 3) |
0b100 |
pp));
// P2
// Mask register determines what elements to zero, rather than what elements to merge
bool z = zeroElements;
// Specifies register-width
byte ll = 0b00;
switch (registerWidth)
{
case 128: ll = 0b00; break;
case 256: ll = 0b01; break;
case 512: ll = 0b10; break;
default: Debug.Assert(false, $"Invalid EVEX vector register width {registerWidth}."); break;
}
// Embedded broadcast in the case of a memory operand
bool bcast = broadcast;
// Extend src2 register
bool vp = (src2Idx & 16) == 0;
// Mask register index
Debug.Assert(maskRegisterIdx < 8, $"Invalid mask register index {maskRegisterIdx}.");
byte aaa = (byte)(maskRegisterIdx & 0b111);
WriteByte(
(byte)(
(z ? 0x80 : 0) |
(ll << 5) |
(bcast ? 0x10 : 0) |
(vp ? 8 : 0) |
aaa));
}
private void WriteCompactInst(Operand operand, int opCode)
{
int regIndex = operand.GetRegister().Index;