Hi, Please assume I'm working with the MIPS. There is a little difference between the MIPS and what I'm actually working on it. How can I remove immediate logical shift right/left from the compiler? I mean If I want the programmer writes an immediate shift, It is compiled to the two instructions:
sll %2,%2,5 changed to: addi %3,%0,5 sllv %2,%2,%3 thanks in advance Ian Lance Taylor-3 wrote: > > yazdanbakhsh <amir.yazdanbak...@gmail.com> writes: > >> I'm working on my a gcc compiler for my own written processor with the >> help >> of SimpleScalar. >> I want to remove "srav/slav" (immediate arithmetic shift) from the >> instruction set. I explore ss.md file but I didn't see any define_ins for >> the mentioned instructions, but they are used in other instruction >> definitions. >> It is also exist for addi/addui. Where I can find the definitions of >> these >> instructions? I want to force gcc to just use register shift and register >> add. > > There is no ss.md file in the standard gcc distribution. If > SimpleScalar has a gcc port, I don't know anything about it. So it's > hard to answer to your question precisely. > > Instructions can come from either a .md file or a .c file in the > config/CPU directory used for your CPU. If those instructions are > appearing in the generated assembler, then they must be in there > somewhere. > > Ian > > -- View this message in context: http://old.nabble.com/Question-about-Machine-Description-tp1026428p28439702.html Sent from the gcc - Dev mailing list archive at Nabble.com.
