https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89485
Bug ID: 89485
Summary: Support vectorcall calling convention on windows
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: yyc1992 at gmail dot com
Target Milestone: ---
I'm very surprised that I didn't find an issue for this so sorry if this is
discussed/rejected somewhere else.
It appears that both MSVC and clang supports a vectorcall calling convention
which is very similar to the one used on linux and passes large vectors in the
corresponding vector register instead of on the stack. It'll be nice if gcc can
support that both for efficiency and for compatibility.
Ref
https://docs.microsoft.com/en-us/cpp/cpp/vectorcall?view=vs-2017
https://clang.llvm.org/docs/AttributeReference.html#id335
