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Re: Floating point insn dependency - GCC 4.1.1
On Fri, Feb 23, 2007 at 07:00:01AM -0800, Ian Lance Taylor wrote:
> 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.
It's possible to insert them during sched2; the ia64 port does this.
r~