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From: Andrew Pinski <pinskia@gmail.com>
Date: Tue, 6 Jun 2023 07:58:05 -0700
Message-ID: <CA+=Sn1=gt-nf4T3vfWDKQLRNKkuBXh98nLbTtiCGDSPhMxyRiQ@mail.gmail.com>
Subject: Re: Passing the complex args in the GPR's
To: Umesh Kalappa <umesh.kalappa0@gmail.com>
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On Tue, Jun 6, 2023 at 7:50=E2=80=AFAM Umesh Kalappa via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> Hi all ,
>
> For the test case https://godbolt.org/z/vjs1vfs5W ,we see the mismatch
> in the ABI b/w gcc and clang .
>
> Do we have any supporting documents that second the GCC behaviour over CL=
ANG ?
>
> EABI states like
>
> In the Power Architecture 64-Bit ELF V2 ABI Specification document
> (v1.1 from 16 July 2015)

You are looking at the wrong ABI document.
That is for the 64bit ABI.
The 32bit ABI document is located at:
http://refspecs.linux-foundation.org/elf/elfspec_ppc.pdf

Plus the 32bit ABI document does not document Complex argument passing
as it was written in 1995 and never updated.

https://www.nxp.com/docs/en/reference-manual/E500ABIUG.pdf does not
document it either.

Thanks,
Andrew Pinski

>
> Page 53:
>
> Map complex floating-point and complex integer types as if the
> argument was specified as separate real
> and imaginary parts.
>
> and in this case the double complexes are broken down with double real
> and double img and expected to pass in FPR not the GPR.
>
>
>
> Thank you
> ~Umesh