Skip to content

Light up String.Manipulation APIs with Vector512 codepath #93043

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
kunalspathak merged 2 commits into from
Dec 22, 2023
Merged

Light up String.Manipulation APIs with Vector512 codepath #93043

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
da32aff
Adding implementation for MakeSeparatorListVectorized and replace(cha…
khushal1996 Oct 5, 2023
e5d2770
throw prejit error incase Vector128 is not supported
khushal1996 Oct 24, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
122 changes: 97 additions & 25 deletions src/libraries/System.Private.CoreLib/src/System/String.Manipulation.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1188,7 +1188,21 @@ public string Replace(char oldChar, char newChar)
// process the remaining elements vectorized too.
// Thus we adjust the pointers so that at least one full vector from the end can be processed.
nuint length = (uint)Length;
if (Vector128.IsHardwareAccelerated && length >= (uint)Vector128<ushort>.Count)
if (Vector512.IsHardwareAccelerated && length >= (uint)Vector512<ushort>.Count)
{
nuint adjust = (length - remainingLength) & ((uint)Vector512<ushort>.Count - 1);
pSrc = ref Unsafe.Subtract(ref pSrc, adjust);
pDst = ref Unsafe.Subtract(ref pDst, adjust);
remainingLength += adjust;
}
else if (Vector256.IsHardwareAccelerated && length >= (uint)Vector256<ushort>.Count)
{
nuint adjust = (length - remainingLength) & ((uint)Vector256<ushort>.Count - 1);
pSrc = ref Unsafe.Subtract(ref pSrc, adjust);
pDst = ref Unsafe.Subtract(ref pDst, adjust);
remainingLength += adjust;
}
else if (Vector128.IsHardwareAccelerated && length >= (uint)Vector128<ushort>.Count)
{
nuint adjust = (length - remainingLength) & ((uint)Vector128<ushort>.Count - 1);
pSrc = ref Unsafe.Subtract(ref pSrc, adjust);
Expand Down Expand Up @@ -1905,40 +1919,98 @@ private static void MakeSeparatorListVectorized(ReadOnlySpan<char> sourceSpan, r
{
throw new PlatformNotSupportedException();
}

Debug.Assert(sourceSpan.Length >= Vector128<ushort>.Count);

nuint offset = 0;
nuint lengthToExamine = (uint)sourceSpan.Length;

nuint offset = 0;
ref char source = ref MemoryMarshal.GetReference(sourceSpan);

Vector128<ushort> v1 = Vector128.Create((ushort)c);
Vector128<ushort> v2 = Vector128.Create((ushort)c2);
Vector128<ushort> v3 = Vector128.Create((ushort)c3);
if (Vector512.IsHardwareAccelerated && lengthToExamine >= (uint)Vector512<ushort>.Count*2)
{
Vector512<ushort> v1 = Vector512.Create((ushort)c);
Vector512<ushort> v2 = Vector512.Create((ushort)c2);
Vector512<ushort> v3 = Vector512.Create((ushort)c3);

do
{
Vector512<ushort> vector = Vector512.LoadUnsafe(ref source, offset);
Vector512<ushort> v1Eq = Vector512.Equals(vector, v1);
Vector512<ushort> v2Eq = Vector512.Equals(vector, v2);
Vector512<ushort> v3Eq = Vector512.Equals(vector, v3);
Vector512<byte> cmp = (v1Eq | v2Eq | v3Eq).AsByte();

do
if (cmp != Vector512<byte>.Zero)
{
// Skip every other bit
ulong mask = cmp.ExtractMostSignificantBits() & 0x5555555555555555;
do
{
uint bitPos = (uint)BitOperations.TrailingZeroCount(mask) / sizeof(char);
sepListBuilder.Append((int)(offset + bitPos));
mask = BitOperations.ResetLowestSetBit(mask);
} while (mask != 0);
}

offset += (nuint)Vector512<ushort>.Count;
} while (offset <= lengthToExamine - (nuint)Vector512<ushort>.Count);
}
else if (Vector256.IsHardwareAccelerated && lengthToExamine >= (uint)Vector256<ushort>.Count*2)
{
Vector128<ushort> vector = Vector128.LoadUnsafe(ref source, offset);
Vector128<ushort> v1Eq = Vector128.Equals(vector, v1);
Vector128<ushort> v2Eq = Vector128.Equals(vector, v2);
Vector128<ushort> v3Eq = Vector128.Equals(vector, v3);
Vector128<byte> cmp = (v1Eq | v2Eq | v3Eq).AsByte();
Vector256<ushort> v1 = Vector256.Create((ushort)c);
Vector256<ushort> v2 = Vector256.Create((ushort)c2);
Vector256<ushort> v3 = Vector256.Create((ushort)c3);

if (cmp != Vector128<byte>.Zero)
do
{
// Skip every other bit
uint mask = cmp.ExtractMostSignificantBits() & 0x5555;
do
Vector256<ushort> vector = Vector256.LoadUnsafe(ref source, offset);
Vector256<ushort> v1Eq = Vector256.Equals(vector, v1);
Vector256<ushort> v2Eq = Vector256.Equals(vector, v2);
Vector256<ushort> v3Eq = Vector256.Equals(vector, v3);
Vector256<byte> cmp = (v1Eq | v2Eq | v3Eq).AsByte();

if (cmp != Vector256<byte>.Zero)
{
uint bitPos = (uint)BitOperations.TrailingZeroCount(mask) / sizeof(char);
sepListBuilder.Append((int)(offset + bitPos));
mask = BitOperations.ResetLowestSetBit(mask);
} while (mask != 0);
}
// Skip every other bit
uint mask = cmp.ExtractMostSignificantBits() & 0x55555555;
do
{
uint bitPos = (uint)BitOperations.TrailingZeroCount(mask) / sizeof(char);
sepListBuilder.Append((int)(offset + bitPos));
mask = BitOperations.ResetLowestSetBit(mask);
} while (mask != 0);
}

offset += (nuint)Vector256<ushort>.Count;
} while (offset <= lengthToExamine - (nuint)Vector256<ushort>.Count);
}
else if (Vector128.IsHardwareAccelerated)
{
Vector128<ushort> v1 = Vector128.Create((ushort)c);
Vector128<ushort> v2 = Vector128.Create((ushort)c2);
Vector128<ushort> v3 = Vector128.Create((ushort)c3);

do
{
Vector128<ushort> vector = Vector128.LoadUnsafe(ref source, offset);
Vector128<ushort> v1Eq = Vector128.Equals(vector, v1);
Vector128<ushort> v2Eq = Vector128.Equals(vector, v2);
Vector128<ushort> v3Eq = Vector128.Equals(vector, v3);
Vector128<byte> cmp = (v1Eq | v2Eq | v3Eq).AsByte();

offset += (nuint)Vector128<ushort>.Count;
} while (offset <= lengthToExamine - (nuint)Vector128<ushort>.Count);
if (cmp != Vector128<byte>.Zero)
{
// Skip every other bit
uint mask = cmp.ExtractMostSignificantBits() & 0x5555;
do
{
uint bitPos = (uint)BitOperations.TrailingZeroCount(mask) / sizeof(char);
sepListBuilder.Append((int)(offset + bitPos));
mask = BitOperations.ResetLowestSetBit(mask);
} while (mask != 0);
}

offset += (nuint)Vector128<ushort>.Count;
} while (offset <= lengthToExamine - (nuint)Vector128<ushort>.Count);
}

while (offset < lengthToExamine)
{
Expand Down