VMManager.cpp (compiled on every target) includes x86emitter.h, which
pulls in x86types.h. That header binds `RTEXTPTR` as a reference to the
x86 register `rbx`:
static constexpr const xAddressReg& RTEXTPTR = rbx;
`rbx` is defined only in x86emitter.cpp, which CMake compiles solely
under ARCH_X86. Binding the reference ODR-uses `rbx`, so on ARM64 it
needs a definition that does not exist. clang (macOS/Linux arm64) dead-
code-eliminates the unused reference and links fine, but MSVC keeps it,
so the Windows-arm64 link failed:
VMManager.cpp.obj : error LNK2001: unresolved external symbol
"class x86Emitter::xAddressReg const x86Emitter::rbx"
pcsx2-qt.exe : fatal error LNK1120: 1 unresolved externals
RTEXTPTR is an x86 concept (the program-text pointer register) and every
real user lives in pcsx2/x86/** or common/emitter/*.cpp, all ARCH_X86-
only and never built on arm64. Gate the alias to _M_X86 so it simply
doesn't exist on arm64 -- no behavior change on x86, and the spurious
rbx reference disappears on Windows arm64.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
In AVX, MOVAPS is the same size as all the other instructions.
In Nehalem (one of the main targets of SSE4), there are bypass penalties for using the wrong mov.
Brian DegenhardtandClaude Opus 4.8
SternXD
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