forked from BilalY/Rasagar
277 lines
10 KiB
C#
277 lines
10 KiB
C#
using System.Diagnostics;
|
|
|
|
namespace Unity.Burst.Intrinsics
|
|
{
|
|
public unsafe static partial class X86
|
|
{
|
|
/// <summary>
|
|
/// bmi1 intrinsics
|
|
/// </summary>
|
|
public static class Bmi1
|
|
{
|
|
/// <summary>
|
|
/// Evaluates to true at compile time if bmi1 intrinsics are supported.
|
|
///
|
|
/// Burst ties bmi1 support to AVX2 support to simplify feature sets to support.
|
|
/// </summary>
|
|
public static bool IsBmi1Supported { get { return Avx2.IsAvx2Supported; } }
|
|
|
|
/// <summary>
|
|
/// Compute the bitwise NOT of 32-bit integer a and then AND with b, and store the results in dst.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** andn r32, r32, r32
|
|
/// </remarks>
|
|
/// <param name="a">32-bit integer</param>
|
|
/// <param name="b">32-bit integer</param>
|
|
/// <returns>32-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static uint andn_u32(uint a, uint b)
|
|
{
|
|
return ~a & b;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Compute the bitwise NOT of 64-bit integer a and then AND with b, and store the results in dst.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** andn r64, r64, r64
|
|
/// </remarks>
|
|
/// <param name="a">64-bit integer</param>
|
|
/// <param name="b">64-bit integer</param>
|
|
/// <returns>64-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static ulong andn_u64(ulong a, ulong b)
|
|
{
|
|
return ~a & b;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Extract contiguous bits from unsigned 32-bit integer a, and store the result in dst. Extract the number of bits specified by len, starting at the bit specified by start.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** bextr r32, r32, r32
|
|
/// </remarks>
|
|
/// <param name="a">32-bit integer</param>
|
|
/// <param name="start">Starting bit</param>
|
|
/// <param name="len">Number of bits</param>
|
|
/// <returns>32-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static uint bextr_u32(uint a, uint start, uint len)
|
|
{
|
|
start &= 0xff;
|
|
|
|
if (start >= (sizeof(uint) * 8))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
var aShifted = a >> (int)start;
|
|
|
|
len &= 0xff;
|
|
|
|
if (len >= (sizeof(uint) * 8))
|
|
{
|
|
return aShifted;
|
|
}
|
|
|
|
return aShifted & ((1u << (int)len) - 1u);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Extract contiguous bits from unsigned 64-bit integer a, and store the result in dst. Extract the number of bits specified by len, starting at the bit specified by start.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** bextr r64, r64, r64
|
|
/// </remarks>
|
|
/// <param name="a">64-bit integer</param>
|
|
/// <param name="start">Starting bit</param>
|
|
/// <param name="len">Number of bits</param>
|
|
/// <returns>64-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static ulong bextr_u64(ulong a, uint start, uint len)
|
|
{
|
|
start &= 0xff;
|
|
|
|
if (start >= (sizeof(ulong) * 8))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
var aShifted = a >> (int)start;
|
|
|
|
len &= 0xff;
|
|
|
|
if (len >= (sizeof(ulong) * 8))
|
|
{
|
|
return aShifted;
|
|
}
|
|
|
|
return aShifted & (((1ul) << (int)len) - 1u);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Extract contiguous bits from unsigned 32-bit integer a, and store the result in dst. Extract the number of bits specified by bits 15:8 of control, starting at the bit specified by bits 0:7 of control..
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** bextr r32, r32, r32
|
|
/// </remarks>
|
|
/// <param name="a">32-bit integer</param>
|
|
/// <param name="control">Control</param>
|
|
/// <returns>32-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static uint bextr2_u32(uint a, uint control)
|
|
{
|
|
uint start = control & byte.MaxValue;
|
|
uint len = (control >> 8) & byte.MaxValue;
|
|
return bextr_u32(a, start, len);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Extract contiguous bits from unsigned 64-bit integer a, and store the result in dst. Extract the number of bits specified by bits 15:8 of control, starting at the bit specified by bits 0:7 of control..
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** bextr r64, r64, r64
|
|
/// </remarks>
|
|
/// <param name="a">32-bit integer</param>
|
|
/// <param name="control">Control</param>
|
|
/// <returns>64-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static ulong bextr2_u64(ulong a, ulong control)
|
|
{
|
|
uint start = (uint)(control & byte.MaxValue);
|
|
uint len = (uint)((control >> 8) & byte.MaxValue);
|
|
return bextr_u64(a, start, len);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Extract the lowest set bit from unsigned 32-bit integer a and set the corresponding bit in dst. All other bits in dst are zeroed, and all bits are zeroed if no bits are set in a.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** blsi r32, r32
|
|
/// </remarks>
|
|
/// <param name="a">32-bit integer</param>
|
|
/// <returns>32-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static uint blsi_u32(uint a)
|
|
{
|
|
return (uint)(-(int)a) & a;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Extract the lowest set bit from unsigned 64-bit integer a and set the corresponding bit in dst. All other bits in dst are zeroed, and all bits are zeroed if no bits are set in a.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** blsi r64, r64
|
|
/// </remarks>
|
|
/// <param name="a">64-bit integer</param>
|
|
/// <returns>64-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static ulong blsi_u64(ulong a)
|
|
{
|
|
return (ulong)(-(long)a) & a;
|
|
}
|
|
/// <summary>
|
|
/// Set all the lower bits of dst up to and including the lowest set bit in unsigned 32-bit integer a.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** blsmsk r32, r32
|
|
/// </remarks>
|
|
/// <param name="a">32-bit integer</param>
|
|
/// <returns>32-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static uint blsmsk_u32(uint a)
|
|
{
|
|
return (a - 1) ^ a;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Set all the lower bits of dst up to and including the lowest set bit in unsigned 64-bit integer a.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** blsmsk r64, r64
|
|
/// </remarks>
|
|
/// <param name="a">64-bit integer</param>
|
|
/// <returns>64-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static ulong blsmsk_u64(ulong a)
|
|
{
|
|
return (a - 1) ^ a;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Copy all bits from unsigned 32-bit integer a to dst, and reset (set to 0) the bit in dst that corresponds to the lowest set bit in a.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** blsr r32, r32
|
|
/// </remarks>
|
|
/// <param name="a">32-bit integer</param>
|
|
/// <returns>32-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static uint blsr_u32(uint a)
|
|
{
|
|
return (a - 1) & a;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Copy all bits from unsigned 64-bit integer a to dst, and reset (set to 0) the bit in dst that corresponds to the lowest set bit in a.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** blsr r64, r64
|
|
/// </remarks>
|
|
/// <param name="a">64-bit integer</param>
|
|
/// <returns>64-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static ulong blsr_u64(ulong a)
|
|
{
|
|
return (a - 1) & a;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Count the number of trailing zero bits in unsigned 32-bit integer a, and return that count in dst.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** tzcnt r32, r32
|
|
/// </remarks>
|
|
/// <param name="a">32-bit integer</param>
|
|
/// <returns>32-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static uint tzcnt_u32(uint a)
|
|
{
|
|
uint c = 32;
|
|
a &= (uint)-(int)(a);
|
|
if (a != 0) c--;
|
|
if ((a & 0x0000FFFF) != 0) c -= 16;
|
|
if ((a & 0x00FF00FF) != 0) c -= 8;
|
|
if ((a & 0x0F0F0F0F) != 0) c -= 4;
|
|
if ((a & 0x33333333) != 0) c -= 2;
|
|
if ((a & 0x55555555) != 0) c -= 1;
|
|
return c;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Count the number of trailing zero bits in unsigned 64-bit integer a, and return that count in dst.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// **** tzcnt r64, r64
|
|
/// </remarks>
|
|
/// <param name="a">64-bit integer</param>
|
|
/// <returns>64-bit integer</returns>
|
|
[DebuggerStepThrough]
|
|
public static ulong tzcnt_u64(ulong a)
|
|
{
|
|
ulong c = 64;
|
|
a &= (ulong)-(long)(a);
|
|
if (a != 0) c--;
|
|
if ((a & 0x00000000FFFFFFFF) != 0) c -= 32;
|
|
if ((a & 0x0000FFFF0000FFFF) != 0) c -= 16;
|
|
if ((a & 0x00FF00FF00FF00FF) != 0) c -= 8;
|
|
if ((a & 0x0F0F0F0F0F0F0F0F) != 0) c -= 4;
|
|
if ((a & 0x3333333333333333) != 0) c -= 2;
|
|
if ((a & 0x5555555555555555) != 0) c -= 1;
|
|
return c;
|
|
}
|
|
}
|
|
}
|
|
}
|