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From: "ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114416] SPARC V9 struct return with floating-point
 members violates ABI
Date: Thu, 21 Mar 2024 15:08:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114416

--- Comment #3 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot U=
ni-Bielefeld.DE> ---
I've now also found p. 3P-10:

%f0 through %f7         Floating-point fields from structure return
(%d0 through %d6)       values with a total size of 32 bytes or less
(%q0 and %q4)           appear in the floating-point registers.

and

%o0 through %o5         Outgoing non-floating-point parameters slots use
                        up to 6 corresponding out registers. Arguments
                        beyond the sixth extended-word appear on the stack.

The second line seems pretty clear that the %o[0-5] registers are only
for non-fp parameter slots, while the first could be interpreted either
way (fp *fields only* or fp fields in general).

While compatibility with the vendor compiler is a strong argument, in
the end the ABI remains the reference.=