From: Richard Sandiford <rdsandiford@googlemail.com>
To: "Maciej W. Rozycki" <macro@linux-mips.org>
Cc: binutils@sourceware.org
Subject: Re: [PATCH 1/5] MIPS/GAS: Fix o32 LD to the base register
Date: Mon, 01 Nov 2010 21:28:00 -0000 [thread overview]
Message-ID: <87vd4gd995.fsf@firetop.home> (raw)
In-Reply-To: <alpine.LFD.2.00.1010312127400.25426@eddie.linux-mips.org> (Maciej W. Rozycki's message of "Sun, 31 Oct 2010 22:46:40 +0000 (GMT)")
"Maciej W. Rozycki" <macro@linux-mips.org> writes:
> binutils-2.20.51-20100925-mips-gas-ld-o-base.patch
> Index: binutils-2.20.51/gas/config/tc-mips.c
> ===================================================================
> --- binutils-2.20.51.orig/gas/config/tc-mips.c
> +++ binutils-2.20.51/gas/config/tc-mips.c
> @@ -7346,17 +7346,29 @@ macro (struct mips_cl_insn *ip)
>
> case M_LD_OB:
> s = HAVE_64BIT_GPRS ? "ld" : "lw";
> + off = 1;
> + /* If the first load would overwrite the base register,
> + then swap the accesses. */
> + if (!HAVE_64BIT_GPRS && treg == breg && breg != ZERO)
> + {
> + offset_expr.X_add_number += 4;
> + treg += 1;
> + off = -1;
> + }
> goto sd_ob;
> +
> case M_SD_OB:
> s = HAVE_64BIT_GPRS ? "sd" : "sw";
> + off = 1;
> +
Add a fallthrough comment if you're adding whitespace. Patches 1-3
are otherwise OK.
I'm not convinced 4 is worthwhile given that these macros are really in
maintenance mode.
I still don't like the way that you're matching ECOFF and ELF offsets
in a single test, allowing two load offsets when (for each format
individually) only one offset is actually acceptable. But patch 5
is OK nonetheless.
Richard
next prev parent reply other threads:[~2010-11-01 21:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-17 16:22 [PATCH 1/2] " Maciej W. Rozycki
2010-10-18 7:48 ` Richard Sandiford
2010-10-18 17:05 ` Maciej W. Rozycki
2010-10-31 22:46 ` [PATCH 1/5] " Maciej W. Rozycki
2010-11-01 21:28 ` Richard Sandiford [this message]
2010-11-01 21:34 ` Richard Sandiford
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