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Re: Crash in process_regs_for_copy

From: Jeff Law <law at redhat dot com>
To: Andreas Schwab <schwab at suse dot de>
Cc: Vladimir Makarov <vmakarov at redhat dot com>, gcc at gcc dot gnu dot org
Date: Mon, 08 Sep 2008 12:58:57 -0600
Subject: Re: Crash in process_regs_for_copy
References: <jehc8qj0c8.fsf@sykes.suse.de>

Andreas Schwab wrote:

I'm testing IRA on m68k (with IRA_COVER_CLASSES defined to {
GENERAL_REGS, FP_REGS, LIM_REG_CLASSES }) and get a crash in
process_regs_for_copy.  It is called with

(insn 22 17 28 4 /cvs/gcc/libgcc/../gcc/libgcc2.c:169 (set (reg/i:SI 0 %d0)
        (subreg:SI (reg/v:DI 30 [ w ]) 4)) 36 {*movsi_m68k2} (expr_list:REG_DEAD (reg/v:DI 30 [ w ])
        (nil)))

and hard_regno becomes -1 due to offset2 == 1.  I don't understand how
substracting offset2 from REGNO (reg1) can make sense here.

Andreas.

Do you have a testcase handy? I just started looking at the m68k as well....

Jeff

Follow-Ups:
- Re: Crash in process_regs_for_copy
  - From: Andreas Schwab

References:
- Crash in process_regs_for_copy
  - From: Andreas Schwab

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