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Re: RFC: Using (set (if_then_else ...)) on IA64 for division instructions
- From: Richard Henderson <rth at redhat dot com>
- To: Steve Ellcey <sje at cup dot hp dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Wed, 29 Sep 2004 10:02:39 -0700
- Subject: Re: RFC: Using (set (if_then_else ...)) on IA64 for division instructions
- References: <200409291607.JAA17570@hpsje.cup.hp.com>
On Wed, Sep 29, 2004 at 09:07:25AM -0700, Steve Ellcey wrote:
> I have been looking at how we generate code to do division on IA64 to
> see if I could get it to be scheduled better. Currently IA64 generates
> a sequence of instructions using cond_exec, the problem with this is
> that cond_exec cannot be expanded until after reload and this results in
> the division instruction sequence being poorly scheduled.
I'm surprised you aren't getting decent results with flag_rename_registers.
> Are there any special problems with using if_then_else inside a set?
Nope.
r~