https://bugs.llvm.org/show_bug.cgi?id=45176
Bug ID: 45176
Summary: [ms] wrong calling convention for member functions
returning simd types in 64-bit
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: nicolaswe...@gmx.de
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
Callee side:
https://godbolt.org/z/5uyPBD
Looks like rdx contains the address of the return buffer before the call, and
rax contains the address of where the data was written after the call.
Calling side:
https://godbolt.org/z/_FMkTv
Both f and g tailcall in clang, but only g does in MSVC -- f copies off the
stack first.
(reported here: https://twitter.com/_xalri/status/1237690440050249733 ; I
tweaked the flags a bit to pass an msvc --target)
See also
https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention?view=vs-2019
(ctrl-f __m128)
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