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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";mso-fareast-language:EN-US">Hi Dmitri,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";mso-fareast-language:EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">>>*Assuming* that LLVM would be accepting the backend, and as long as you scope the processing of these proprietary pragmas to your target and your target only, I think there
should be no issue.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";mso-fareast-language:EN-US">Thank you very much!<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";mso-fareast-language:EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">>>I recommend that you provide a source-to-source translation tool<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";mso-fareast-language:EN-US">I already did this for Renesas RX (proprietary compiler
-> GCC RX) many years ago. <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";mso-fareast-language:EN-US">Fortunately the two proprietary compilers (for RX
and RL78) share roughly the same pragmas/extensions so I can reuse it.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";mso-fareast-language:EN-US">The tool is based on
<span class="SpellE">RecursiveASTVisitor</span> (and clang 3.3).<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";mso-fareast-language:EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";mso-fareast-language:EN-US">Best Regards,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";mso-fareast-language:EN-US">Sebastian<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";mso-fareast-language:EN-US"><o:p> </o:p></span></font></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><font size="2" face="Calibri"><span lang="EN-US" style="font-size:11.0pt;mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US;font-weight:bold">From:</span></font></b><span lang="EN-US" style="mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US">
Dmitri Gribenko <gribozavr@gmail.com> <br>
<b><span style="font-weight:bold">Sent:</span></b> 08 April 2020 09:38<br>
<b><span style="font-weight:bold">To:</span></b> Sebastian Perta <Sebastian.Perta@renesas.com><br>
<b><span style="font-weight:bold">Cc:</span></b> cfe-dev@lists.llvm.org<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [cfe-dev] question about possible new extensions (mainly pragmas) in clang for new LLVM backend for Renesas RL78 MCU<o:p></o:p></span></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Hi Sebastian,<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">On Wed, Apr 1, 2020 at 8:45 PM Sebastian Perta via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a>> wrote:<o:p></o:p></span></font></p>
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<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;mso-border-left-alt:solid #CCCCCC .75pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">My question here will be: are the following CCRL extensions acceptable to be implemented in clang? especially since for most of them we already/can have alternative implementations
using __attribute__ and other approaches more in line with clang extensions.<br>
<br>
<br>
First things I would like to explain are the pragmas.<br>
Most CCRL pragmas have a trait which is quite unusual: the first parameter is function or a variable name, for example in order to declare a interrupt functions while in GCC I do:<br>
void inter ( void ) __attribute__((interrupt));<br>
In CCRL this is declared the following way:<br>
#pragma interrupt inter<br>
void inter ( void ) {<br>
}<br>
<br>
I haven't checked the clang source code but I imagine it is not straight forward to tie a pragma to a particular function declaration as there are no other such pragmas as far as I'm aware.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<div>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">It would require a little infrastructure work, but I think it would be quite doable. Generally, for your pragmas it seems like you might need to extend support for attaching pragmas
as attributes to functions. Please take a look at how '#pragma omp declare' (for example, '#pragma omp declare simd', '#pragma omp declare variant') are implemented.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<div>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">*Assuming* that LLVM would be accepting the backend, and as long as you scope the processing of these proprietary pragmas to your target and your target only, I think there should
be no issue.<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<div>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">However, given the advantages of standard attributes and general practice in writing modern C and C++, it would be a lot better if we could avoid proprietary pragmas, or at least
have a plan towards removing them in future.<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<div>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Upgrading the compiler would not be completely transparent for your customers anyway, some manual adjustments to the source code would be necessary (for example, to get rid of
other proprietary extensions and reliance on implementation-defined behaviors, recover performance, fix bugs uncovered by the new compiler etc.) I recommend that you provide a source-to-source translation tool that translates the pragmas to attributes, as
well as translating the unusual assembly syntax into the more widely accepted GCC asm extension. If the your current toolchain supports that spelling, the customers could even run the tool, translate the code to use a more widely accepted syntax, validate
the changes using the old toolchain (should be a no-op), and then migrate to Clang.<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Implementing the inline assembler extension would be more difficult than pragmas. Clang already supports MSVC's inline assembler (see clang/test/CodeGen/ms-inline-asm-64.c, for
example), but implementing it was a major endeavor. It created non-trivial maintenance burden, because the MSVC inline assembler allowed to incorporate some C and C++ expressions and declaration references directly into the assembly commands. If your dialect
does not have such power, it might be easier to support, but again, my best suggestion is to consider asking users to run a source-to-source translation to the GCC inline asm extension, or the MSVC inline asm since it is already supported in Clang and not
going away.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Developing a source-to-source translation tool would be beneficial not just for eliminating these pragmas and unusual inline asm, but also for eliminating many other small incompatibilities
between your proprietary toolchain and Clang that you will undoubtedly find. While implementing pragmas in Clang is realistic and practical, implementing bug-for-bug compatibility for other issues is not, and customers would have to change the code in order
to upgrade the toolchain. While they do that, they could as well run a source-to-source translation tool to eliminate pragmas and unusual inline asm -- if the translation tool is reliable, those additional edits would be trivial to review, compared to the
effort needed to find and eliminate other incompatibilities and newly found bugs.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Dmitri<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">--
<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if<br>
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <<a href="mailto:gribozavr@gmail.com" target="_blank">gribozavr@gmail.com</a>>*/<o:p></o:p></span></font></p>
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