[release/7.0-rc1] Optimized string.Replace(char, char)#74047

Merged

danmoseley merged 11 commits intorelease/7.0-rc1from

backport/pr-67049-to-release/7.0-rc1

Aug 17, 2022

Commits on Aug 17, 2022

Optimized string.Replace(char, char) vector code path

gfoidl
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Optimized code pathes even further

gfoidl
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Do vectorized operation at the end of the string only once

gfoidl
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Don't use trick for collapsed epilogs

gfoidl
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Handle remainder vectorized even if remainingLength <= Vector<ushort>.Count and added tests for this

gfoidl
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Introduce (internal) Vector.LoadUnsafe and Vector.StoreUnsafe and use it in string.Replace(char, char)

gfoidl
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Avoid Unsafe.As<char, ushort> reinterpret casts by introducing string.GetRawStringDataAsUshort() internal method

gfoidl
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Fixed copy/paste error (from local dev to repo)

gfoidl
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PR Feedback

gfoidl
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Fixed bug and added tests for this

gfoidl
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Make condition about lengthToExamine clearer as suggested

gfoidl
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