Le 30 mai 2024 12:40:20 GMT+03:00, "Tomas Härdin" <g...@haerdin.se> a écrit :
>tor 2024-05-30 klockan 09:41 +0300 skrev Rémi Denis-Courmont:
>> Hi,
>>
>> Le 30 mai 2024 01:13:14 GMT+03:00, "Tomas Härdin" <g...@haerdin.se> a
>> écrit :
>> > The entire patchset passes FATE
>>
>> Is the version in riscv/intmath.h safe? It looks to me that the GCC
>> codegen for not only RV64 but also AArch{32,64} and x86-64 is better
>> than this.
>
>I haven't checked. It seems weird to me to have two different C
>versions.
The common one ends up horrendously bad on RV, and presumably on MIPS and some
other RISC ISA.
> We shouldn't rely on type punning.
Because?
We should depend on punning as long as it conforms to the standard.
> The standard compliant way
>is to use memcpy()
That's way worse than union in terms of how proactively the compiler needs to
optimise, and both approaches are as confirming.
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