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Replace unaligned casts in SpanHelpers.Memmove #98812

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merged 5 commits into from
Apr 15, 2024
Merged

Replace unaligned casts in SpanHelpers.Memmove #98812

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9dcb260
Replace unaligned casts in `SpanHelpers.Memmove`
xtqqczze Feb 28, 2024
4755aa2
Merge branch 'main' into Memmove
xtqqczze Mar 14, 2024
fbf614e
Merge branch 'main' into Memmove
xtqqczze Mar 27, 2024
1b56cbe
Merge branch 'main' into Memmove
xtqqczze Apr 6, 2024
ce7fcba
Merge branch 'main' into Memmove
xtqqczze Apr 8, 2024
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140 changes: 70 additions & 70 deletions src/libraries/System.Private.CoreLib/src/System/SpanHelpers.ByteMemOps.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -58,56 +58,56 @@ internal static unsafe void Memmove(ref byte dest, ref byte src, nuint len)
// Copy bytes which are multiples of 16 and leave the remainder for MCPY01 to handle.
Debug.Assert(len > 16 && len <= 64);
#if HAS_CUSTOM_BLOCKS
Unsafe.As<byte, Block16>(ref dest) = Unsafe.As<byte, Block16>(ref src); // [0,16]
Unsafe.WriteUnaligned(ref dest, Unsafe.ReadUnaligned<Block16>(ref src));
#elif TARGET_64BIT
Unsafe.As<byte, long>(ref dest) = Unsafe.As<byte, long>(ref src);
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 8)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 8)); // [0,16]
Unsafe.WriteUnaligned(ref dest, Unsafe.ReadUnaligned<long>(ref src));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 8), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 8)));
#else
Unsafe.As<byte, int>(ref dest) = Unsafe.As<byte, int>(ref src);
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 4)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 4));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 8)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 8));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 12)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 12)); // [0,16]
Unsafe.WriteUnaligned(ref dest, Unsafe.ReadUnaligned<int>(ref src));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 4), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 4)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 8), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 8)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 12), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 12)));
#endif
if (len <= 32)
goto MCPY01;
#if HAS_CUSTOM_BLOCKS
Unsafe.As<byte, Block16>(ref Unsafe.Add(ref dest, 16)) = Unsafe.As<byte, Block16>(ref Unsafe.Add(ref src, 16)); // [0,32]
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 16), Unsafe.ReadUnaligned<Block16>(ref Unsafe.Add(ref src, 16)));
#elif TARGET_64BIT
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 16)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 16));
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 24)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 24)); // [0,32]
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 16), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 16)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 24), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 24)));
#else
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 16)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 16));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 20)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 20));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 24)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 24));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 28)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 28)); // [0,32]
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 16), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 16)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 20), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 20)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 24), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 24)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 28), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 28)));
#endif
if (len <= 48)
goto MCPY01;
#if HAS_CUSTOM_BLOCKS
Unsafe.As<byte, Block16>(ref Unsafe.Add(ref dest, 32)) = Unsafe.As<byte, Block16>(ref Unsafe.Add(ref src, 32)); // [0,48]
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 32), Unsafe.ReadUnaligned<Block16>(ref Unsafe.Add(ref src, 32)));
#elif TARGET_64BIT
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 32)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 32));
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 40)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 40)); // [0,48]
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 32), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 32)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 40), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 40)));
#else
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 32)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 32));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 36)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 36));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 40)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 40));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 44)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 44)); // [0,48]
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 32), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 32)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 36), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 36)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 40), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 40)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 44), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 44)));
#endif

MCPY01:
// Unconditionally copy the last 16 bytes using destEnd and srcEnd and return.
Debug.Assert(len > 16 && len <= 64);
#if HAS_CUSTOM_BLOCKS
Unsafe.As<byte, Block16>(ref Unsafe.Add(ref destEnd, -16)) = Unsafe.As<byte, Block16>(ref Unsafe.Add(ref srcEnd, -16));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -16), Unsafe.ReadUnaligned<Block16>(ref Unsafe.Add(ref srcEnd, -16)));
#elif TARGET_64BIT
Unsafe.As<byte, long>(ref Unsafe.Add(ref destEnd, -16)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref srcEnd, -16));
Unsafe.As<byte, long>(ref Unsafe.Add(ref destEnd, -8)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref srcEnd, -8));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -16), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref srcEnd, -16)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -8), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref srcEnd, -8)));
#else
Unsafe.As<byte, int>(ref Unsafe.Add(ref destEnd, -16)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref srcEnd, -16));
Unsafe.As<byte, int>(ref Unsafe.Add(ref destEnd, -12)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref srcEnd, -12));
Unsafe.As<byte, int>(ref Unsafe.Add(ref destEnd, -8)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref srcEnd, -8));
Unsafe.As<byte, int>(ref Unsafe.Add(ref destEnd, -4)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref srcEnd, -4));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -16), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref srcEnd, -16)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -12), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref srcEnd, -12)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -8), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref srcEnd, -8)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -4), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref srcEnd, -4)));
#endif
return;

Expand All @@ -117,13 +117,13 @@ internal static unsafe void Memmove(ref byte dest, ref byte src, nuint len)
goto MCPY03;
Debug.Assert(len >= 8 && len <= 16);
#if TARGET_64BIT
Unsafe.As<byte, long>(ref dest) = Unsafe.As<byte, long>(ref src);
Unsafe.As<byte, long>(ref Unsafe.Add(ref destEnd, -8)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref srcEnd, -8));
Unsafe.WriteUnaligned(ref dest, Unsafe.ReadUnaligned<long>(ref src));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -8), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref srcEnd, -8)));
#else
Unsafe.As<byte, int>(ref dest) = Unsafe.As<byte, int>(ref src);
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 4)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 4));
Unsafe.As<byte, int>(ref Unsafe.Add(ref destEnd, -8)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref srcEnd, -8));
Unsafe.As<byte, int>(ref Unsafe.Add(ref destEnd, -4)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref srcEnd, -4));
Unsafe.WriteUnaligned(ref dest, Unsafe.ReadUnaligned<int>(ref src));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 4), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 4)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -8), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref srcEnd, -8)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -4), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref srcEnd, -4)));
#endif
return;

Expand All @@ -132,8 +132,8 @@ internal static unsafe void Memmove(ref byte dest, ref byte src, nuint len)
if ((len & 4) == 0)
goto MCPY04;
Debug.Assert(len >= 4 && len < 8);
Unsafe.As<byte, int>(ref dest) = Unsafe.As<byte, int>(ref src);
Unsafe.As<byte, int>(ref Unsafe.Add(ref destEnd, -4)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref srcEnd, -4));
Unsafe.WriteUnaligned(ref dest, Unsafe.ReadUnaligned<int>(ref src));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -4), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref srcEnd, -4)));
return;

MCPY04:
Expand All @@ -144,7 +144,7 @@ internal static unsafe void Memmove(ref byte dest, ref byte src, nuint len)
dest = src;
if ((len & 2) == 0)
return;
Unsafe.As<byte, short>(ref Unsafe.Add(ref destEnd, -2)) = Unsafe.As<byte, short>(ref Unsafe.Add(ref srcEnd, -2));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -2), Unsafe.ReadUnaligned<short>(ref Unsafe.Add(ref srcEnd, -2)));
return;

MCPY05:
Expand All @@ -163,7 +163,7 @@ internal static unsafe void Memmove(ref byte dest, ref byte src, nuint len)
// dest is more important to align than src because an unaligned store is more expensive
// than an unaligned load.
nuint misalignedElements = 64 - Unsafe.OpportunisticMisalignment(ref dest, 64);
Unsafe.As<byte, Block64>(ref dest) = Unsafe.As<byte, Block64>(ref src);
Unsafe.WriteUnaligned(ref dest, Unsafe.ReadUnaligned<Block64>(ref src));
src = ref Unsafe.Add(ref src, misalignedElements);
dest = ref Unsafe.Add(ref dest, misalignedElements);
len -= misalignedElements;
Expand All @@ -177,33 +177,33 @@ internal static unsafe void Memmove(ref byte dest, ref byte src, nuint len)

MCPY06:
#if HAS_CUSTOM_BLOCKS
Unsafe.As<byte, Block64>(ref dest) = Unsafe.As<byte, Block64>(ref src);
Unsafe.WriteUnaligned(ref dest, Unsafe.ReadUnaligned<Block64>(ref src));
#elif TARGET_64BIT
Unsafe.As<byte, long>(ref dest) = Unsafe.As<byte, long>(ref src);
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 8)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 8));
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 16)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 16));
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 24)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 24));
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 32)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 32));
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 40)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 40));
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 48)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 48));
Unsafe.As<byte, long>(ref Unsafe.Add(ref dest, 56)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref src, 56));
Unsafe.WriteUnaligned(ref dest, Unsafe.ReadUnaligned<long>(ref src));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 8), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 8)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 16), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 16)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 24), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 24)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 32), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 32)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 40), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 40)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 48), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 48)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 56), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref src, 56)));
#else
Unsafe.As<byte, int>(ref dest) = Unsafe.As<byte, int>(ref src);
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 4)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 4));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 8)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 8));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 12)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 12));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 16)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 16));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 20)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 20));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 24)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 24));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 28)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 28));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 32)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 32));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 36)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 36));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 40)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 40));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 44)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 44));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 48)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 48));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 52)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 52));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 56)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 56));
Unsafe.As<byte, int>(ref Unsafe.Add(ref dest, 60)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref src, 60));
Unsafe.WriteUnaligned(ref dest, Unsafe.ReadUnaligned<int>(ref src));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 4), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 4)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 8), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 8)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 12), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 12)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 16), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 16)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 20), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 20)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 24), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 24)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 28), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 28)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 32), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 32)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 36), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 36)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 40), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 40)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 44), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 44)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 48), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 48)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 52), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 52)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 56), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 56)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref dest, 60), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref src, 60)));
#endif
dest = ref Unsafe.Add(ref dest, 64);
src = ref Unsafe.Add(ref src, 64);
Expand All @@ -215,15 +215,15 @@ internal static unsafe void Memmove(ref byte dest, ref byte src, nuint len)
if (len > 16)
goto MCPY00;
#if HAS_CUSTOM_BLOCKS
Unsafe.As<byte, Block16>(ref Unsafe.Add(ref destEnd, -16)) = Unsafe.As<byte, Block16>(ref Unsafe.Add(ref srcEnd, -16));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -16), Unsafe.ReadUnaligned<Block16>(ref Unsafe.Add(ref srcEnd, -16)));
#elif TARGET_64BIT
Unsafe.As<byte, long>(ref Unsafe.Add(ref destEnd, -16)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref srcEnd, -16));
Unsafe.As<byte, long>(ref Unsafe.Add(ref destEnd, -8)) = Unsafe.As<byte, long>(ref Unsafe.Add(ref srcEnd, -8));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -16), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref srcEnd, -16)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -8), Unsafe.ReadUnaligned<long>(ref Unsafe.Add(ref srcEnd, -8)));
#else
Unsafe.As<byte, int>(ref Unsafe.Add(ref destEnd, -16)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref srcEnd, -16));
Unsafe.As<byte, int>(ref Unsafe.Add(ref destEnd, -12)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref srcEnd, -12));
Unsafe.As<byte, int>(ref Unsafe.Add(ref destEnd, -8)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref srcEnd, -8));
Unsafe.As<byte, int>(ref Unsafe.Add(ref destEnd, -4)) = Unsafe.As<byte, int>(ref Unsafe.Add(ref srcEnd, -4));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -16), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref srcEnd, -16)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -12), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref srcEnd, -12)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -8), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref srcEnd, -8)));
Unsafe.WriteUnaligned(ref Unsafe.Add(ref destEnd, -4), Unsafe.ReadUnaligned<int>(ref Unsafe.Add(ref srcEnd, -4)));
#endif
return;

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