> From: Fredrik Noring <nor...@nocrew.org> > Subject: Re: [PATCH v2 4/6] target/mips: Fix decoding mechanism of special > R5900 opcodes > > Hi Aleksandar, > > > Fredrik, do you know by any chance if a document exists that would justify > > inclusion of non-R5900 DMULT, DMULTU, DDIV, DDIVU in R5900 executables by > > gcc for R5900? Is it included by cross-gcc or by native gcc, or by both? > > > > I think gcc folks must have had a good reason for that, some kind of > > design - it can't be 'I really like/miss this instruction, let's include > > it...' > > The R5900 reports itself as MIPS III ...
This is very unclear. What do you mean by this? How does R5900 do that? I can't find any trace of such intentions in R5900 docs. > ... and DMULT, DMULTU, DDIV and DDIVU > are part of the MIPS III ISA. They are emulated in user mode to support > generic MIPS III programs. Pure MIPS III executables should not be a concern of the R5900 emulation, but R5900 executables. Could you please provide a document that would justify inclusion of these non-R5900 instruction in an R5900 emulation? Thanks, Aleksandar
