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Re: [BENCH] Improvements to popping x87 stack in reg-stack.c
- From: Richard Henderson <rth at redhat dot com>
- To: Uros Bizjak <uros at kss-loka dot si>
- Cc: Roger Sayle <roger at eyesopen dot com>, gcc-patches at gcc dot gnu dot org
- Date: Wed, 1 Dec 2004 01:38:29 -0800
- Subject: Re: [BENCH] Improvements to popping x87 stack in reg-stack.c
- References: <41AADBDD.email@example.com> <20041130021009.GB1489@redhat.com> <41AD850F.firstname.lastname@example.org> <20041201085122.GA6460@redhat.com> <41AD8ABC.email@example.com>
On Wed, Dec 01, 2004 at 10:11:24AM +0100, Uros Bizjak wrote:
> >Surely that value is for a store to memory, not a register to
> >register move....
> No, this is register to register move.
I can't believe that's anything except a typo or measurement error.
The table says that the latency of a reg-reg move is larger than the
latency of a floating point addition. That simply doesn't pass the