From: Joern Rennecke <joern.rennecke@superh.com>
To: roger@eyesopen.com (Roger Sayle)
Cc: gcc@gcc.gnu.org, gcc-patches@gcc.gnu.org,
joern.rennecke@superh.com (Joern Rennecke),
rth@redhat.com (Richard Henderson)
Subject: Re: Floating point registers vs. LOAD_EXTEND_OP on alpha
Date: Mon, 19 Jan 2004 20:33:00 -0000 [thread overview]
Message-ID: <200401192032.i0JKWqQ20132@linsvr1.uk.superh.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0401181003080.27690-100000@www.eyesopen.com> from "Roger Sayle" at Jan 18, 2004 10:18:59
> Hopefully, this analysis is enough for an alpha maintainer to determine
> whether Joern needs an additional check in his post-reload patch or if
> the alpha backend's LOAD_EXTEND_OP should claim to be extending in these
> modes.
I could check
CANNOT_CHANGE_MODE_CLASS (GET_MODE (op), word_mode,
REGNO_REG_CLASS (REGNO (SET_DEST (set)))) ,
but there is similar code in reload_cse_simplify_set that would also
need to be changed, and we'd have to document that LOAD_EXTEND_OP
does not apply to hard registers whose reg class cannot change to
word_mode or any integral integer mode between the mode of the
memory reference and word_mode. (If it could do the latter change,
we'd need data flow analysis to find out if an extension is suposed
to take place).
next prev parent reply other threads:[~2004-01-19 20:33 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-18 18:05 Roger Sayle
2004-01-18 19:01 ` Richard Henderson
2004-01-18 22:29 ` Richard Henderson
2004-01-19 20:33 ` Joern Rennecke [this message]
2004-01-19 20:41 ` Richard Henderson
2004-01-20 9:30 ` Richard Sandiford
2004-01-20 17:17 ` Richard Henderson
2004-01-20 19:05 ` Joern Rennecke
2004-01-20 19:21 ` Joern Rennecke
2004-01-26 19:30 ` Eric Botcazou
2004-01-26 19:46 ` Joern Rennecke
2004-01-26 20:06 ` Gerald Pfeifer
2004-01-26 20:53 ` Joern Rennecke
2004-01-26 21:16 ` Eric Botcazou
2004-01-26 21:18 ` Gabriel Dos Reis
2004-01-26 20:38 ` Eric Botcazou
2004-01-22 9:49 ` Richard Sandiford
2004-01-22 19:32 ` Richard Henderson
2004-01-19 21:25 ` Joern Rennecke
2004-01-19 21:38 ` Richard Henderson
2004-01-18 20:42 Richard Kenner
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