On Tue, Jun 6, 2023 at 7:50 AM Umesh Kalappa via Libc-alpha <libc-al...@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 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: 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
