Re: Floating point insn dependency - GCC 4.1.1

[Paul Brook <paul at codesourcery dot com>]

> > 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