Re: soft-fp functions support without using libgcc
On 21 May 2014 14:13, Sheheryar Zahoor Qazi sheheryar.zahoor.q...@gmail.com wrote: Building libgcc is not optional. It is required for all targets. So, irrespective whether i provide floating point implementation by soft-fp, fpu-bit or ieeelib, an error free libgcc build is a MUST? What if I dont want to generate calls to libgcc.a but want want gcc to generate inline code? While this is not possible for all calls, a lot of library calls can be avoided or emitted with a custome ABI by having a suitable expander in the .md file that emits whatever you want. E.g., several of the ARC subtargets/mulitlibs emit inline code for the simpler soft-fp functions, and custom calls to optimized assembler for medium complexity operations. You should really read md.texi and look at optabs.def to get a glimpse of the code generation customization potential of GCC.
Re: soft-fp functions support without using libgcc
On Tue, May 20, 2014 at 10:47 PM, Ian Lance Taylor i...@google.com wrote: On Tue, May 20, 2014 at 12:51 PM, Sheheryar Zahoor Qazi sheheryar.zahoor.q...@gmail.com wrote: Hi again! You need to look in target-arch/libgcc/config.log to see what the problem is. config.log states the following error: configure:2590: checking for suffix of object files configure:2611: /home/lab/target/target-gcc/builddir/./gcc/xgcc -B/home/lab/target/target-gcc/builddir/./gcc/ -B/usr/local/target/bin/ -B/usr/local/target/lib/ -isystem /usr/local/target/include -isystem /usr/local/target/sys-include -c -g -O2conftest.c 5 /home/laboruser/spartanmc/spartanmc-gcc/builddir/./gcc/as: 76: exec: : Permission denied configure:2614: $? = 1 configure: failed program was: | /* confdefs.h. */ Is it complaining for root access?? Please reply to the mailing list, not just to me. Thanks. I doubt it is a root access issue. Look at the permissions of the gcc/as file. You will probably need to debug it a bit to find out why it is failing. It's just a shell script so it shouldn't be too hard. It's because libgcc was not built. What are my options to provide software floating point support to my architecture if I am unable to build libgcc for my target? Any example implementation?? Building libgcc is not optional. It is required for all targets. Ian
Re: soft-fp functions support without using libgcc
Building libgcc is not optional. It is required for all targets. So, irrespective whether i provide floating point implementation by soft-fp, fpu-bit or ieeelib, an error free libgcc build is a MUST? What if I dont want to generate calls to libgcc.a but want want gcc to generate inline code? Regards Sheheryar
Re: soft-fp functions support without using libgcc
On Wed, May 21, 2014 at 6:13 AM, Sheheryar Zahoor Qazi sheheryar.zahoor.q...@gmail.com wrote: Building libgcc is not optional. It is required for all targets. So, irrespective whether i provide floating point implementation by soft-fp, fpu-bit or ieeelib, an error free libgcc build is a MUST? Yes. What if I dont want to generate calls to libgcc.a but want want gcc to generate inline code? libgcc also provides functionality that GCC requires that can not reasonably be inlined, such as the stack unwind code used for exception handling. Ian
Re: soft-fp functions support without using libgcc
If you have a working compiler that is missing some functions provided by libgcc, that should be sufficient to build libgcc. Meaning that even if i am unable build libgcc to my new architecture, I should be able to able to provide soft-fp support to the architecture? Btw i get the following error when i build gcc: configure:2627: error: in `/target-arch/target-arch-gcc/builddir/target-arch/libgcc': configure:2630: error: cannot compute suffix of object files: cannot compile And regarding soft-fp, I get the following error when i use soft-fp functions in a test program: : In function `test': (.text+0x0): undefined reference to `__floatsisf' In function `test': : In function `test': (.text+0x2c): undefined reference to `__mulsf3' : In function `test': (.text+0x2e): undefined reference to `__fixsfsi' Is this due to libgcc build fail or it just linking error? In other words, if you want soft-fp for IEEE float, the job should be very simple because that has already been done. If you want soft-fp for CDC 6000 float, you have to do a full implementation of that. Actually i want soft-fp for standard IEEE 754 Sheheryar On Fri, May 16, 2014 at 6:34 PM, paul_kon...@dell.com wrote: On May 16, 2014, at 12:25 PM, Ian Bolton ian.bol...@arm.com wrote: On Fri, May 16, 2014 at 6:34 AM, Sheheryar Zahoor Qazi sheheryar.zahoor.q...@gmail.com wrote: I am trying to provide soft-fp support to a an 18-bit soft-core processor architecture at my university. But the problem is that libgcc has not been cross-compiled for my target architecture and some functions are missing so i cannot build libgcc.I believe soft-fp is compiled in libgcc so i am usable to invoke soft-fp functions from libgcc. It is possible for me to provide soft-fp support without using libgcc. How should i proceed in defining the functions? Any idea? And does any archoitecture provide floating point support withoput using libgcc? I'm sorry, I don't understand the premise of your question. It is not necessary to build libgcc before building libgcc. That would not make sense. If you have a working compiler that is missing some functions provided by libgcc, that should be sufficient to build libgcc. If you replace cross-compiled with ported, I think it makes senses. Can one provide soft-fp support without porting libgcc for their architecture? By definition, in soft-fp you have to implement the FP operations in software. That’s not quite the same as porting libgcc to the target architecture. It should translate to porting libgcc (the FP emulation part) to the floating point format being used. In other words, if you want soft-fp for IEEE float, the job should be very simple because that has already been done. If you want soft-fp for CDC 6000 float, you have to do a full implementation of that. paul
Re: soft-fp functions support without using libgcc
On Tue, May 20, 2014 at 7:37 AM, Sheheryar Zahoor Qazi sheheryar.zahoor.q...@gmail.com wrote: If you have a working compiler that is missing some functions provided by libgcc, that should be sufficient to build libgcc. Meaning that even if i am unable build libgcc to my new architecture, I should be able to able to provide soft-fp support to the architecture? You need to build soft-fp as part of libgcc. What I am saying is that you don't need soft-fp support in order to build libgcc. Btw i get the following error when i build gcc: configure:2627: error: in `/target-arch/target-arch-gcc/builddir/target-arch/libgcc': configure:2630: error: cannot compute suffix of object files: cannot compile You need to look in target-arch/libgcc/config.log to see what the problem is. And regarding soft-fp, I get the following error when i use soft-fp functions in a test program: : In function `test': (.text+0x0): undefined reference to `__floatsisf' In function `test': : In function `test': (.text+0x2c): undefined reference to `__mulsf3' : In function `test': (.text+0x2e): undefined reference to `__fixsfsi' Is this due to libgcc build fail or it just linking error? It's because libgcc was not built. Ian
soft-fp functions support without using libgcc
Hi all, I am trying to provide soft-fp support to a an 18-bit soft-core processor architecture at my university. But the problem is that libgcc has not been cross-compiled for my target architecture and some functions are missing so i cannot build libgcc.I believe soft-fp is compiled in libgcc so i am usable to invoke soft-fp functions from libgcc. It is possible for me to provide soft-fp support without using libgcc. How should i proceed in defining the functions? Any idea? And does any archoitecture provide floating point support withoput using libgcc? Regards Sheheryar
Re: soft-fp functions support without using libgcc
On Fri, May 16, 2014 at 6:34 AM, Sheheryar Zahoor Qazi sheheryar.zahoor.q...@gmail.com wrote: I am trying to provide soft-fp support to a an 18-bit soft-core processor architecture at my university. But the problem is that libgcc has not been cross-compiled for my target architecture and some functions are missing so i cannot build libgcc.I believe soft-fp is compiled in libgcc so i am usable to invoke soft-fp functions from libgcc. It is possible for me to provide soft-fp support without using libgcc. How should i proceed in defining the functions? Any idea? And does any archoitecture provide floating point support withoput using libgcc? I'm sorry, I don't understand the premise of your question. It is not necessary to build libgcc before building libgcc. That would not make sense. If you have a working compiler that is missing some functions provided by libgcc, that should be sufficient to build libgcc. Ian
RE: soft-fp functions support without using libgcc
On Fri, May 16, 2014 at 6:34 AM, Sheheryar Zahoor Qazi sheheryar.zahoor.q...@gmail.com wrote: I am trying to provide soft-fp support to a an 18-bit soft-core processor architecture at my university. But the problem is that libgcc has not been cross-compiled for my target architecture and some functions are missing so i cannot build libgcc.I believe soft-fp is compiled in libgcc so i am usable to invoke soft-fp functions from libgcc. It is possible for me to provide soft-fp support without using libgcc. How should i proceed in defining the functions? Any idea? And does any archoitecture provide floating point support withoput using libgcc? I'm sorry, I don't understand the premise of your question. It is not necessary to build libgcc before building libgcc. That would not make sense. If you have a working compiler that is missing some functions provided by libgcc, that should be sufficient to build libgcc. If you replace cross-compiled with ported, I think it makes senses. Can one provide soft-fp support without porting libgcc for their architecture? Cheers, Ian
Re: soft-fp functions support without using libgcc
On May 16, 2014, at 12:25 PM, Ian Bolton ian.bol...@arm.com wrote: On Fri, May 16, 2014 at 6:34 AM, Sheheryar Zahoor Qazi sheheryar.zahoor.q...@gmail.com wrote: I am trying to provide soft-fp support to a an 18-bit soft-core processor architecture at my university. But the problem is that libgcc has not been cross-compiled for my target architecture and some functions are missing so i cannot build libgcc.I believe soft-fp is compiled in libgcc so i am usable to invoke soft-fp functions from libgcc. It is possible for me to provide soft-fp support without using libgcc. How should i proceed in defining the functions? Any idea? And does any archoitecture provide floating point support withoput using libgcc? I'm sorry, I don't understand the premise of your question. It is not necessary to build libgcc before building libgcc. That would not make sense. If you have a working compiler that is missing some functions provided by libgcc, that should be sufficient to build libgcc. If you replace cross-compiled with ported, I think it makes senses. Can one provide soft-fp support without porting libgcc for their architecture? By definition, in soft-fp you have to implement the FP operations in software. That’s not quite the same as porting libgcc to the target architecture. It should translate to porting libgcc (the FP emulation part) to the floating point format being used. In other words, if you want soft-fp for IEEE float, the job should be very simple because that has already been done. If you want soft-fp for CDC 6000 float, you have to do a full implementation of that. paul
