Passing the complex args in the GPR's

Andrew Pinski pinskia at
Wed Jun 7 00:58:05 AEST 2023

On Tue, Jun 6, 2023 at 7:50 AM Umesh Kalappa via Libc-alpha
<libc-alpha at> wrote:
> Hi all ,
> For the test case ,we see the mismatch
> in the ABI b/w gcc and clang .
> Do we have any supporting documents that second the GCC behaviour over CLANG ?
> 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:

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

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

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