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Re: Q: regmove.c:gen_add3_insn

To: Richard Henderson <rth at cygnus dot com>
Subject: Re: Q: regmove.c:gen_add3_insn
From: Thomas Sailer <sailer at ife dot ee dot ethz dot ch>
Date: Thu, 13 Apr 2000 10:36:14 +0200
CC: gcc at gcc dot gnu dot org
Organization: IfE
References: <38F43F27.5CEA2B0D@ife.ee.ethz.ch> <20000412134339.A13204@cygnus.com>

Richard Henderson wrote:
> 
> On Wed, Apr 12, 2000 at 11:17:27AM +0200, Thomas Sailer wrote:
> > If the target does not support word_mode adds with constants,
> 
> How irritating.

Not really. Many fixed point DSP architectures use PQImode
for addresses (which may or may not support immediate adds)
and QImode for the data (thus word_mode is QImode), and do
not support QImode immediate adds. Example architectures
are Motorola 56k and Analog Devices ADSP-21xx (newer variants
of the latter incidentally support QImode adds with _some_
constants of which 2 is a member).

Tom

References:
- Q: regmove.c:gen_add3_insn
  - From: Thomas Sailer
- Re: Q: regmove.c:gen_add3_insn
  - From: Richard Henderson

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