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GH-50527: [C++] Remove ARROW_SSE4_2_FLAG for x86 MSVC #50526

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GH-50527: [C++] Remove ARROW_SSE4_2_FLAG for x86 MSVC #50526

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2 changes: 1 addition & 1 deletion cpp/cmake_modules/SetupCxxFlags.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,7 @@ endif()
if(ARROW_CPU_FLAG STREQUAL "x86")
# x86/amd64 compiler flags, msvc/gcc/clang
if(MSVC)
set(ARROW_SSE4_2_FLAG "/arch:SSE4.2")
set(ARROW_SSE4_2_FLAG "")

@kou kou Jul 17, 2026

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Can we do this only for x86 environment?
This disables SSE 4.2 on x64 environment too.

# These definitions are needed for xsimd to consider the corresponding instruction
# sets available, but they are not set by MSVC (unlike other compilers).
# See https://github.com/AcademySoftwareFoundation/OpenImageIO/issues/4265
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