Re: PATCH for reorg.c: Avoid side_effects_p when "opposite arithmetic".

[Hans-Peter Nilsson <hans-peter dot nilsson at axis dot com>]

> Date: Thu, 13 Apr 2000 10:17:32 +1200 (NZST)
> From: Michael Hayes <m.hayes@elec.canterbury.ac.nz>

> Hans-Peter Nilsson writes:
>  > For targets with delay-slots that can hold a "plus" or "minus" arithmetic
>  > insn, and where an operand can have a side-effect (like a memory operand
>  > with a post-increment or a volatile access), a bug is lurking in
>  > reorg.c.  This test-case might trig it; it does for CRIS:
> 
> There are a number of bugs in reorg.c (especially for targets with
> multiple delay slots).  Herman Ten Brugge has repeatedly posted
> patches to this list but they have never been approved.

I guess I'm lucky in that delay-slots in CRIS are simple; single
and non-annullable, conditioned in the .md with a straightforward
per-insn-alternative attribute.

> I'm attaching the current diffs to reorg.c that I have in my c4x
> development tree.  I'd be interested to see if they fix your problem.

I can't say definitely no, but I did not spot a fix for the bug
at hand.  Thanks anyway.  BTW, the patch is now installed
following Jeff's approval; the test-case is committed as
gcc.c-torture/execute/20000412-6.c

brgds, H-P