[llvm-dev] [clang] sign extension of parameters

[Craig Topper via llvm-dev]

I believe there's other target specific code hiding in
clang/lib/Driver/ToolChains/Clang.cpp. Maybe other files in that directory
too.

~Craig


On Tue, Oct 19, 2021 at 10:51 AM Bagel <bagel99 at gmail.com> wrote:

> Oh my!  I had thought that all the target-dependent code was under
> lib/Basic/Targets/.  Looks like I have more work to do. Is there other
> target-dependent code hiding elsewhere in the tree?
>
> Thanks for the prompt reply,
> Brian
>
>
> On 10/19/21 12:21 PM, Craig Topper wrote:
> > I believe it is done by calling ABIArgInfo::getExtend in the ABI
> handling in
> > clang/lib/CodeGen/TargetInfo.cpp. This will add a signext or zeroext
> attribute
> > to the argument in IR. The backend can use this to insert the
> appropriate extend.
> >
> > ~Craig
> >
> > On Tue, Oct 19, 2021 at 10:14 AM Bagel via llvm-dev <
> llvm-dev at lists.llvm.org
> > <mailto:llvm-dev at lists.llvm.org>> wrote:
> >
> >     My target is 64-bit only, it has no 32-bit operations other than
> LD/ST.
> >     Parameters need to be sign or zero extended.  Where in clang does
> one indicate
> >     that for a target?
> >
> >     Thanks,
> >     Brian
> >     _______________________________________________
> >     LLVM Developers mailing list
> >     llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
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> >
>
>
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