Roman Zippel - Re: [m68k 12/13] properly align within code (original) (raw)

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• From: Roman Zippel
• To: Jeffrey Law
• Cc: gcc-patches at gcc dot gnu dot org
• Date: Wed, 7 Feb 2007 22:09:36 +0100 (CET)
• Subject: Re: [m68k 12/13] properly align within code
• References: 20070130112615.782382000@linux-m68k.org 20070130114608.438023000@linux-m68k.org <1170695058.4061.119.camel@sweet.slc.redhat.com>

Hi,

On Mon, 5 Feb 2007, Jeffrey Law wrote:

If using some of -falign options with a larger alignment, no proper nop instruction is inserted. The patch uses "move.l %a4,%a4" as nop (the real nop has synchronizing properties).

2007-01-30 Roman Zippel zippel@linux-m68k.org

* config/m68k/m68k.h (ASM_OUTPUT_ALIGN_WITH_NOP): New, use
"move.l %a4,%a4" to produce nops.

My m68k is rusty -- presumably move.l ,addrreg doesn't muck the status bits, right?

Indeed.

Assuming that's the case my only concern would be whether or not the .balign pseudo-op is accepted by the various m68k assemblers.

Currently gas is the only assembler left and it's only generated if one uses one of -falign options.

bye, Roman

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