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Temporarily disable arm64 intrinsics in UTF-16 validation code paths #42052

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Sep 10, 2020
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Temporarily disable arm64 intrinsics in UTF-16 validation code paths #42052

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6 changes: 5 additions & 1 deletion src/libraries/System.Private.CoreLib/src/System/Text/Unicode/Utf16Utility.Validation.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,11 @@ static Utf16Utility()
long tempUtf8CodeUnitCountAdjustment = 0;
int tempScalarCountAdjustment = 0;

if ((AdvSimd.Arm64.IsSupported && BitConverter.IsLittleEndian) || Sse2.IsSupported)
// Per https://github.com/dotnet/runtime/issues/41699, temporarily disabling
// ARM64-intrinsicified code paths. ARM64 platforms may still use the vectorized
// non-intrinsicified 'else' block below.

if (/* (AdvSimd.Arm64.IsSupported && BitConverter.IsLittleEndian) || */ Sse2.IsSupported)
{
if (inputLength >= Vector128<ushort>.Count)
{
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