[llvm-dev] Sparc Software Float library calls

Jacob Hansen via llvm-dev llvm-dev at lists.llvm.org
Mon Apr 18 05:50:43 PDT 2016

I am working on a patch to add software floating point support on Sparc. 
The solution rely on library calls such as __adddf3, __muldf3, __subdf3 
etc. I have been able to successfully link to these functions from the 
compiler-rt project builtins (which I compiled manually as I could not 
find a way to cross-compile the compiler-rt builtins for Sparc with the 
current build system), and I also tested linking with libgcc. Both 
appears to be working well.

I am unsure if I need to provide a deeper integration with compiler-rt 
(i.e provide a way to (cross-)compile compiler-rt so the patch can be 
used without manual linking/building the required software floating 
point builtins), or whether it would be OK to leave it as is and rely on 
the user to ensure the correct libraries are provided at linking?

I am also working on a patch to enable the option to be enabled with 
-msoft-float in Clang, although I am having an issues with the Target 
Features being reset in the backend, when I do not manually provide the 
soft float option to llc (mattr). It appears related to the following 
, and it looks like I would need to implement this change for the Sparc 
target in order to get it to work, but maybe there is a better way of 
doing it?


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