<div dir="auto">Can you post a godbolt link? that would also show which command line options you're using. <div dir="auto"><br></div><div dir="auto">So this is with gas and -fno-integrated-as?</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Oct 11, 2021, 1:42 AM Alexander von Below <<a href="mailto:below@mac.com">below@mac.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
one thing I should stress: This appears to be a C-Frontend issue (and thus I am posting it here) because when using as directly, this problem does not occur: <a href="https://github.com/below/HelloSilicon/blob/main/Chapter%2005/upper.s" rel="noreferrer noreferrer" target="_blank">https://github.com/below/HelloSilicon/blob/main/Chapter%2005/upper.s</a><br>
<br>
I have taken your suggestions: Changing the name of „cont“ to something that does not sound like a keyword does not help.<br>
Adding a ".global _faz\n“ (or ".global faz“) does not change anything, neither does „BGT .Lfaz\n“ seem to have any effect.<br>
<br>
Let me know if you have any other ideas<br>
<br>
Thanks<br>
<br>
Alex<br>
<br>
> Am 11.10.2021 um 01:59 schrieb Brian Cain <<a href="mailto:brian.cain@gmail.com" target="_blank" rel="noreferrer">brian.cain@gmail.com</a>>:<br>
> <br>
> Does the behavior change if you declare "cont" as a global symbol? Does the symbol have to be "cont"? Would ".Lcont" suffice? Many targets treat leading ".L" as implicitly local symbols.<br>
> <br>
> On Sun, Oct 10, 2021 at 6:30 PM Alexander von Below via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org" target="_blank" rel="noreferrer">cfe-dev@lists.llvm.org</a>> wrote:<br>
> Thanks a lot for your answer, and yes, I do: <br>
> <br>
> Working code (using numeric label): <a href="https://github.com/below/HelloSilicon/blob/main/Chapter%2009/uppertst4.c" rel="noreferrer noreferrer" target="_blank">https://github.com/below/HelloSilicon/blob/main/Chapter%2009/uppertst4.c</a><br>
> Non-working (original) code: <a href="https://github.com/below/HelloSilicon/blob/4c4b2911c43644adfd3b78aee093857444f28472/Chapter%209/uppertst4.c" rel="noreferrer noreferrer" target="_blank">https://github.com/below/HelloSilicon/blob/4c4b2911c43644adfd3b78aee093857444f28472/Chapter%209/uppertst4.c</a><br>
> <br>
> Compile using the makefile in the same folder, or using "clang -o uppertst4 uppertst4.c“<br>
> <br>
> On godbolt, running the original code through armv8-a-clang 11.0.1 or trunk, everything seems to work fine. There is an unrelated warning, but no errors. The output shows both the loop and the cont labels: <a href="https://godbolt.org/z/xY5afcYdW" rel="noreferrer noreferrer" target="_blank">https://godbolt.org/z/xY5afcYdW</a><br>
> <br>
> Compiling the code with the symbolic cont label on an M1 using clang-1300.0.29.3 produces the errors:<br>
> <br>
> uppertst4.c:22:4: error: conditional branch requires assembler-local label. 'cont' is external.<br>
> "BGT cont\n"<br>
> ^<br>
> <inline asm>:4:1: note: instantiated into assembly here<br>
> BGT cont<br>
> ^<br>
> uppertst4.c:24:4: error: conditional branch requires assembler-local label. 'cont' is external.<br>
> "BLT cont\n"<br>
> ^<br>
> <inline asm>:6:1: note: instantiated into assembly here<br>
> BLT cont<br>
> ^<br>
> uppertst4.c:28:4: error: conditional branch requires assembler-local label. 'loop' is external.<br>
> "<a href="http://B.NE" rel="noreferrer noreferrer" target="_blank">B.NE</a> loop\n"<br>
> ^<br>
> <inline asm>:10:1: note: instantiated into assembly here<br>
> <a href="http://B.NE" rel="noreferrer noreferrer" target="_blank">B.NE</a> loop<br>
> ^<br>
> <br>
> Notably, now for both loop and cont, while it is sufficient to replace cont with a numeric label.<br>
> <br>
> I would be glad to find out if I am doing it wrong, or if this is an issue in clang. And now my curiosity is raised why godbolt appears to differ from clang on macOS …<br>
> <br>
> Thanks again<br>
> <br>
> Alex<br>
> <br>
> <br>
> > Am 11.10.2021 um 00:26 schrieb Joerg Sonnenberger via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org" target="_blank" rel="noreferrer">cfe-dev@lists.llvm.org</a>>:<br>
> > <br>
> > On Sun, Oct 10, 2021 at 12:27:28PM +0200, Alexander von Below via cfe-dev wrote:<br>
> >> I have tried to adapt gnu as code for Apple Silicon, and I have found<br>
> >> explanations for most differences. There is one issue I still have:<br>
> > <br>
> > Do you actually have a complete self-contained example? Try <a href="http://godbolt.org" rel="noreferrer noreferrer" target="_blank">godbolt.org</a>.<br>
> > <br>
> > Joerg<br>
> > _______________________________________________<br>
> > cfe-dev mailing list<br>
> > <a href="mailto:cfe-dev@lists.llvm.org" target="_blank" rel="noreferrer">cfe-dev@lists.llvm.org</a><br>
> > <a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev" rel="noreferrer noreferrer" target="_blank">https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev</a><br>
> <br>
> _______________________________________________<br>
> cfe-dev mailing list<br>
> <a href="mailto:cfe-dev@lists.llvm.org" target="_blank" rel="noreferrer">cfe-dev@lists.llvm.org</a><br>
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> <br>
> <br>
> -- <br>
> -Brian<br>
<br>
</blockquote></div>