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[jh@suse.cz: Re: target/9929: [3.3/3.4 regression] Can't find spill register]
- From: Jan Hubicka <jh at suse dot cz>
- To: gcc-patches at gcc dot gnu dot org, rth at redhat dot com
- Date: Tue, 25 Mar 2003 00:47:38 +0100
- Subject: [jh@suse.cz: Re: target/9929: [3.3/3.4 regression] Can't find spill register]
Forgot gcc-pathes in the CC
----- Forwarded message from Jan Hubicka <jh at suse dot cz> -----
Delivered-To: hubicka at kam dot mff dot cuni dot cz
Date: Tue, 25 Mar 2003 00:06:42 +0100
From: Jan Hubicka <jh at suse dot cz>
To: Janis Johnson <janis187 at us dot ibm dot com>
Cc: Steven Bosscher <s dot bosscher at student dot tudelft dot nl>, gabor at mac dot com,
gcc-gnats at gcc dot gnu dot org, gcc-bugs at gcc dot gnu dot org, nobody at gcc dot gnu dot org,
gcc-prs at gcc dot gnu dot org, jh at suse dot cz
Subject: Re: target/9929: [3.3/3.4 regression] Can't find spill register
In-Reply-To: <20030324140419 dot A9656 at us dot ibm dot com>
User-Agent: Mutt/1.3.28i
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> On Mon, Mar 24, 2003 at 09:00:40PM +0100, Steven Bosscher wrote:
> >
> > Janis, can you hunt this one?
>
> The regression showed up with this patch:
>
> Sat Mar 30 14:08:55 CET 2002 Jan Hubicka <jh at suse dot cz>
>
> * local-alloc.c (local_alloc): Avoid call of update_equiv_regs
> when not optimizing.
>
> * toplev.c (rest_of_compilation): Cann mark_constant_function
> only when optimizing.
>
> * flow.c (calculate_global_regs_live): Ensure that all AUX fields
> are NULL.
>
> * cfgcleanup.c (bb_flags): Add BB_NONTHREADABLE_BLOCK.
> (thread_jump): Set BB_NONTHREADABLE_BLOCK, check it.
> (try_optimize_cfg): clear all AUX fields.
>
> * i386.c (aligned_operand): Be prepared for SUBREGed registers.
> (ix86_decompose_address): Use REG_P instead of GET_CODE (...) == REG.
> (ix86_address_cost): Be prepared for SUBREGed registers.
> (legitimate_address_p): Accept SUBREGed registers.
>
> The hunt used Wolfgang's reduced test case with "-O -fPIC" on
> i686-pc-linux-gnu.
Tue Mar 25 00:05:27 CET 2003 Jan Hubicka <jh at suse dot cz>
* i386.c (legitimate_address_p): Refuse DImore registers in 32bit compilation.
Index: i386.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/i386/i386.c,v
retrieving revision 1.552
diff -c -3 -p -r1.552 i386.c
*** i386.c 22 Mar 2003 20:02:22 -0000 1.552
--- i386.c 24 Mar 2003 23:05:11 -0000
*************** legitimate_address_p (mode, addr, strict
*** 5936,5941 ****
--- 5936,5949 ----
goto report_error;
}
+ /* We can run out of registers when we do allow subregs
+ of DImode regsiters. */
+ if (GET_MODE (reg) == DImode && !TARGET_64BIT)
+ {
+ reason = "base reg is DImore";
+ goto report_error;
+ }
+
if ((strict && ! REG_OK_FOR_BASE_STRICT_P (reg))
|| (! strict && ! REG_OK_FOR_BASE_NONSTRICT_P (reg)))
{
*************** legitimate_address_p (mode, addr, strict
*** 5971,5976 ****
--- 5979,5993 ----
reason = "index is not in Pmode";
goto report_error;
}
+
+ /* We can run out of registers when we do allow subregs
+ of DImode regsiters. */
+ if (GET_MODE (reg) == DImode && !TARGET_64BIT)
+ {
+ reason = "index reg is DImore";
+ goto report_error;
+ }
+
if ((strict && ! REG_OK_FOR_INDEX_STRICT_P (reg))
|| (! strict && ! REG_OK_FOR_INDEX_NONSTRICT_P (reg)))
----- End forwarded message -----