Hi Ian,
Could you please share some code pointers or documents about how 'go'
functions calling 'c' functions is implemented,
I'm looking into the following function
at gofrontend/libgo/go/bytes/bytes.go:102, where c-function IndexByte in
bytealg.c/bytealg.c:90
is called but with wrong argument bindings, the issue is sort of expected
as a bunch of changes on arm are not in place now.
Thanks a lot.
// IndexByte returns the index of the first instance of c in b, or -1 if c
is not present in b.
func IndexByte(b []byte, c byte) int {
return bytealg.IndexByte(b, c)
}
On Tuesday, July 16, 2019 at 5:40:24 AM UTC+8, Ian Lance Taylor wrote:
>
> On Mon, Jul 15, 2019 at 7:39 AM Xiangdong Ji <xiang...@gmail.com
> <javascript:>> wrote:
> >
> > I am trying to build gollvm on ARM with a few experimental changes,
> looks like some ARM Neon intrinsics in
> > libgo/runtime/aeshash.c are not supported by GCC 7/8, wo
> ndering if it could be solved by any additional compile
> > options, or should the latest gcc-9 or clang be used?
>
> The arm64 support in aeshash.c was added in GCC 9. In general there
> is no expectation that the files in GCC 9 can be compiled by earlier
> versions of GCC. Many times it will work, but not always, and this
> may be a case where it fails (I haven't checked). It's not feasible
> for us to ensure that files distributed with GCC 9 can be compiled by
> earlier versions of GCC.
>
> In any case, if your goal is to build GoLLVM, then you should be
> compiling this file with clang. And it sounds like you can do that.
> So there doesn't seem to be much reason to compile it with GCC. I
> understand that you are having trouble building GoLLVM, but it's not
> clear to me why building this file with GCC rather than clang will
> help with that.
>
> Ian
>
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