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Improve struct promotion for 256-bit SIMD fields #19663

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Aug 29, 2018
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Improve struct promotion for 256-bit SIMD fields #19663

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5 changes: 3 additions & 2 deletions src/jit/lclvars.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1497,8 +1497,9 @@ void Compiler::lvaCanPromoteStructType(CORINFO_CLASS_HANDLE typeHnd,
CLANG_FORMAT_COMMENT_ANCHOR;
#if defined(FEATURE_SIMD)
#if defined(_TARGET_XARCH_)
// This will allow promotion of 2 Vector<T> fields on AVX2, or 4 Vector<T> fields on SSE2.
const int MaxOffset = MAX_NumOfFieldsInPromotableStruct * XMM_REGSIZE_BYTES;
// This will allow promotion of 4 Vector<T> fields on AVX2 or Vector256<T> on AVX,
// or 8 Vector<T>/Vector128<T> fields on SSE2.
const int MaxOffset = MAX_NumOfFieldsInPromotableStruct * YMM_REGSIZE_BYTES;
#elif defined(_TARGET_ARM64_)
const int MaxOffset = MAX_NumOfFieldsInPromotableStruct * FP_REGSIZE_BYTES;
#endif // defined(_TARGET_XARCH_) || defined(_TARGET_ARM64_)
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