Messages in this thread | | | From | Paul Burton <> | Subject | Re: [PATCH v4 3/7] mips: rename macros and files from '64' to 'n64' | Date | Mon, 10 Dec 2018 23:46:21 +0000 |
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Hi Maciej,
On Mon, Dec 10, 2018 at 11:32:46PM +0000, Maciej W. Rozycki wrote: > On Mon, 10 Dec 2018, Paul Burton wrote: > > > And I realise that undoing that but keeping n64 in our own filenames & > > macros is another type of inconsistency, but something imperfect is > > unavoidable at this point given that the engineers way back when decided > > to use "ABI64" for n64. > > My feeling has been n32 was invented at SGI as an afterthought, hence the > choice of having ABI32 or ABI64 defined for the 32-bit (now o32) and the > 64-bit (now n64) ABI respectively was reasonable.
I'd agree if _MIPS_SIM were defined as _ABI32 for o32, but:
$ mips-linux-gcc -mabi=32 -dM -E - </dev/null | grep ABIO32 #define _ABIO32 1 #define _MIPS_SIM _ABIO32
...so _MIPS_SIM is:
_ABIO32 for o32 _ABIN32 for n32 _ABI64 for n64
That doesn't seem very consistent to me, and means that there inevitably has to be some ugliness once there are multiple 64-bit ABIs.
To me it feels like the result of someone thinking "one 64-bit MIPS ABI ought to be enough for anybody". I'm undecided whether that person was shortsighted or a genius whose vision was simply incomprehensible to those of us that followed.
Thanks, Paul
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