Hi Allesandro, This sounds great, I had been merging in trunk every few months but haven't had much time to maintain it beyond this recently, so good to see it being improved.
Is the code for your changes available somewhere, it would be nice to have a look/give the enhancements a try? Thanks, Simon On 23 May 2014 16:00, "Alessandro Di Federico" < [email protected]> wrote: > Hi all guys, we are a group of research from the compiler group of > Politecnico di Milano, Italy. We are currently working on a compiler > for the OpenRISC architecture in the context of a project in > collaboration with the University of Bologna and the ETH of Zurich. > > Basically we've been working to update existing LLVM backend for > OpenRISC to the current official trunk and we have introduced several > fixes and improvement, among which: > > * Refactoring of various parts of the backend (both TableGen and C++). > * We implemented support for the missing instructions (l.m{f,t}spr, > l.addc, l.ext* and so on). > * Major improvements in the integrated disassembler. > * Some codegen improvements, in particular in instruction selection > and scheduling. > * Fixed some bugs. > > Currently we're working on the selection of the MAC instruction in the > IR, on the floating point and refactoring on the Clang driver and > TargetInfo description. > > We also have a proposal for a change to ABI in order to fix the > inconsistency of the calling convention between ordinary and variadic > functions. In particular, our proposal keeps unchanged the calling > convention for ordinary functions. The parameter passing mechanisim is > identical for both ordinary and variadic function, thus making the > caller agnostic w.r.t. the callee kind (ordinary or variadic). > Therefore we modified the va_list structure in order properly track > parameters passed by register (that must be copied on the stack at the > function entry) and parameters passed on the stack. > Currently we implemented this ABI variant in our LLVM backend, and we'd > be happy to have some feedback from you about it. > > We'd be excited to give a talk at ORCONF 2014 about this, if you find > this of interest. > > -- > Alessandro Di Federico > _______________________________________________ > OpenRISC mailing list > [email protected] > http://lists.openrisc.net/listinfo/openrisc >
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