> > 1. Is there a way to check for dependency b/w this two instructions. > > 2. Any existing backend that has this type of design. > > gcc currently does a relatively crummy job of handling this type of > VLIW architecture. You can describe the dependencies in the > scheduler, but the scheduler won't insert any required nops for you. > The usual approach is walk through the insn chain in the MD reorg pass > and insert nops at that time. For example, look at mips_reorg in > config/mips/mips.c. I've also done it in FINAL_PRESCAN_INSN.
Given you only have limited dual-issue, could the delay slot mechanisms be used for this? Paul
