[llvm-dev] RFC: [MC] Calculate difference of symbols in two consecutive MCDataFragments

Jian Cai via llvm-dev llvm-dev at lists.llvm.org
Tue Nov 5 13:24:24 PST 2019

Yes, thanks for the correction.


On Tue, Nov 5, 2019 at 1:20 PM Reid Kleckner <rnk at google.com> wrote:

> I think you meant to link to this patch here:
> https://reviews.llvm.org/D69411
> There's too much discussion for me to read and understand, but I think
> what would help the most is developing a clear summary of what the gnu
> assembler's behavior is. Do they defer evaluation of the if condition? Do
> they under or overestimate offsets in the ambiguous cases? Or do they just
> error out cases where there are relaxable fragments between labels? That
> should help us pick a more general direction for this feature.
> On Tue, Nov 5, 2019 at 12:08 PM Jian Cai via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>> Hello,
>> I've been trying to add support to the integrated assembler to handle
>> cases like below
>> foo:instr; .if . - foo; instr; .endif
>> when the dot symbol and foo are assigned to consecutive MCDataFragments
>> <https://github.com/ClangBuiltLinux/linux/issues/744>. I have a patch
>> <https://reviews.llvm.org/D6941> under review. And even though it seems
>> to solve the problem, the concern is it complicates the code and we would
>> like to know if there is more decent way to handle this. Please feel free
>> to share your thoughts.
>> Thanks,
>> Jian
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
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