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Re: m68k bootstrapping broken
Gunther Nikl <gni@gecko.de> writes:
> On Wed, Jan 14, 2004 at 06:12:21PM +0100, Andreas Schwab wrote:
>> Gunther Nikl <gni@gecko.de> writes:
>>
>> > If there is no difference then your patch doesn't have any effect,
>> > does it?
>>
>> It should have an effect, but you first have to verify that the bug exists
>> in the first place. The m68k-amigaos configuration may be different
>> enough from m68k-linux to hide the bug. Although this was a long standing
>> bug, it didn't trigger until now during gcc bootstraps.
>
> A small testcase showing the bug would be helpful.
This is very difficult to create. The problem on m68k-linux showed in
insn-recog.o where in a few places a "tst.l %dN" was missing after the
load of a constant handled by output_move_const_into_data_reg. It only
showed up because -funit-at-a-time (implied by -O2) managed to inline
recog_3 into recog_7.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
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