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slightly faster ARM kernel #37

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Merged
lemire merged 1 commit into from
Apr 3, 2025
Merged

slightly faster ARM kernel #37

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22 changes: 7 additions & 15 deletions src/Base64ARM.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -344,23 +344,15 @@ private static unsafe void Base64DecodeBlock(byte* outPtr, byte* srcPtr)
// Load 4 vectors from src
var (str0, str1, str2, str3) = AdvSimd.Arm64.Load4xVector128AndUnzip(srcPtr);

// Perform bitwise operations to simulate NEON intrinsics
Vector128<byte> outvec0 = AdvSimd.ShiftLeftAndInsert(
AdvSimd.ShiftRightLogical(str1, 4), str0, 2);

Vector128<byte> outvec1 = AdvSimd.ShiftLeftAndInsert(
AdvSimd.ShiftRightLogical(str2, 2), str1, 4);

// Perform bitwise operations to simulate NEON intrinsics
Vector128<byte> outvec0 = AdvSimd.Or(
AdvSimd.ShiftLeftLogical(str0, 2),
AdvSimd.ShiftRightLogical(str1, 4)
);

Vector128<byte> outvec1 = AdvSimd.Or(
AdvSimd.ShiftLeftLogical(str1, 4),
AdvSimd.ShiftRightLogical(str2, 2)
);

Vector128<byte> outvec2 = AdvSimd.Or(
AdvSimd.ShiftLeftLogical(str2, 6),
str3
);
Vector128<byte> outvec2 = AdvSimd.ShiftLeftAndInsert(
str3, str2, 6);

// Store the result in outData
AdvSimd.Arm64.StoreVectorAndZip(outPtr, (outvec0, outvec1, outvec2));
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