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Re: RA best is NO_REGS

From: "Paulo J. Matos" <paulo at matos-sorge dot com>
To: gcc at gcc dot gnu dot org
Date: Thu, 14 Jun 2012 14:03:31 +0100
Subject: Re: RA best is NO_REGS
References: <jrcmhe$mln$1@dough.gmane.org>

I forgot to mention this is in 4.7.0. 4.6.3 happily assigns the right classes to the registers. I wonder if there's any new macro in 4.7 that I haven't defined...

On 14/06/12 13:47, Paulo J. Matos wrote:

Hi,

I found a problem with my port where IRA generates a spill error. After
looking at the logs I get this kind of output for the best class for the
pseudo regs:

Pass 0 for finding pseudo/allocno costs

a2 (r30,l0) best NO_REGS, allocno NO_REGS
a3 (r29,l0) best NO_REGS, allocno NO_REGS
a4 (r28,l0) best NO_REGS, allocno NO_REGS
a5 (r27,l0) best NO_REGS, allocno NO_REGS
a0 (r26,l0) best XL_REG, allocno XL_REG
a1 (r20,l0) best AL_REG, allocno AL_REG

This doesn't look good. Why NO_REGS?

Cheers,

--
PMatos

References:
- RA best is NO_REGS
  - From: Paulo J. Matos

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