https://issues.dlang.org/show_bug.cgi?id=24124

Walter Bright <bugzilla@digitalmars.com> changed:

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                 CC|                            |bugzilla@digitalmars.com

--- Comment #1 from Walter Bright <bugzilla@digitalmars.com> ---
Is there a path through the headers that does not rely on the gcc SIMD intrinsics?

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https://issues.dlang.org/show_bug.cgi?id=24124

--- Comment #2 from Steven Schveighoffer <schveiguy@gmail.com> ---
Yes, I can define STBI_NO_SIMD and it will not use the SIMD calls. But this might not be a general solution for projects which don't have that configuration option.

Note that I believe LDC has fixed this: https://github.com/ldc-developers/ldc/commit/798f73bd37308abc7aaef21e411f1615c4422022

But DMD may not have that luxury.

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https://issues.dlang.org/show_bug.cgi?id=24124

--- Comment #3 from Walter Bright <bugzilla@digitalmars.com> ---
Supporting gcc's instrinsic builtins would be a major project to add to dmd. If your project needs them, pragmatically you'll need to use gdc/ldc.

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https://issues.dlang.org/show_bug.cgi?id=24124

Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
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            Summary|ImportC: building           |ImportC: gcc simd
                   |stb_image.h has errors in   |intrinsics not supported by
                   |gcc                         |dmd

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https://issues.dlang.org/show_bug.cgi?id=24124

--- Comment #4 from Dlang Bot <dlang-bot@dlang.rocks> ---
@WalterBright created dlang/dmd pull request #15779 "Issue 24124 - ImportC: gcc simd intrinsics not supported by dmd" mentioning this issue:

- Issue 24124 - ImportC: gcc simd intrinsics not supported by dmd

https://github.com/dlang/dmd/pull/15779

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https://issues.dlang.org/show_bug.cgi?id=24124

--- Comment #5 from Walter Bright <bugzilla@digitalmars.com> ---
BTW, dmd supports all the x86 SIMD instructions in the inline assembler.

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https://issues.dlang.org/show_bug.cgi?id=24124

mhh <maxhaton@gmail.com> changed:

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--- Comment #6 from mhh <maxhaton@gmail.com> ---
Guillaume has implemented most of the library of intel intrinsics in his library if they are genuinely required (I have been saying this should be pinched for druntime for a while alas he isn't keen)

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https://issues.dlang.org/show_bug.cgi?id=24124

--- Comment #7 from Walter Bright <bugzilla@digitalmars.com> ---
(In reply to mhh from comment #6)
> Guillaume has implemented most of the library of intel intrinsics in his library if they are genuinely required (I have been saying this should be pinched for druntime for a while alas he isn't keen)

Can you link to it here, please?

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https://issues.dlang.org/show_bug.cgi?id=24124

Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #8 from Walter Bright <bugzilla@digitalmars.com> ---
1. dmd does not support gcc simd intrinsics, and is not likely to

2. the library in question has a #define for disabling use of those intrinsics, and it's a 3rd party library

Hence, I'm going to resolve this as WONTFIX.

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https://issues.dlang.org/show_bug.cgi?id=24124

--- Comment #9 from Steven Schveighoffer <schveiguy@gmail.com> ---
In general, I agree with this result.

The unfortunate reality is, many C libraries are going to use the definitions from the local c preprocessor (which is not related to DMD) to make decisions, which means that code simply won't compile with DMD.

The only real solution would be for DMD to require a specific set of C headers and C preprocessor that goes with it, and code to that.

ImportC with system headers might be a LDC/GDC-only thing.

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