From: "Paul Edwards" <mutazilah@gmail.com>
To: "Ulrich Weigand" <uweigand@de.ibm.com>
Cc: <gcc@gcc.gnu.org>
Subject: Re: i370 port
Date: Sat, 19 Sep 2009 12:57:00 -0000 [thread overview]
Message-ID: <DFDE65489C1B4E72BFBC16DB18144993@Paullaptop> (raw)
In-Reply-To: <200909181608.n8IG8Dqi000786@d12av02.megacenter.de.ibm.com>
>> C:\devel\gccnew\gcc>gccmvs -DUSE_MEMMGR -Os -S -ansi -pedantic-errors -DHAVE_CON
>> FIG_H -DIN_GCC -DPUREISO -I ../../pdos/pdpclib -I . -I config/i370 -I
>> ../include
>> varasm.c
>> (insn 117 429 118 7 (parallel [
>> (set (reg:SI 64)
>> (compare:SI (mem/s:BLK (plus:SI (reg/f:SI 21
>> virtual-stack-vars)
>>
>> (const_int 456 [0x1c8])) [232 value+0 S196
>> A64])
>> (mem:BLK (plus:SI (reg/v/f:SI 61 [ desc ])
>> (const_int 8 [0x8])) [0 A8])))
>> (use (const_int 196 [0xc4]))
>> ]) -1 (nil)
>> (nil))
>> varasm.c: In function `force_const_mem':
>> varasm.c:3021: internal compiler error: in
>> instantiate_virtual_regs_lossage,
>> at function.c:3767
>
> OK, so what goes on here is that GCC attempts to replace the "virtual"
> register 21 (virtual-stack-vars) with some real register, that is
> frame pointer + STARTING_FRAME_OFFSET. It seems for the i370 port,
> this should resolve to
> register 13 + STACK_POINTER_OFFSET + current_function_outgoing_args_size
>
> Overall, the middle-end would therefore replace "reg 21 + 456" with
> "reg 13 + X", where X is constant computed from 456 + STACK_POINTER_OFFSET
> + current_function_outgoing_args_size.
>
> It will then re-process the insn pattern constraints to verify that the
> resulting insn is still valid. At this stage, it appears we're running
> into the above error. I'm not quite sure why this would be case, this
> will require some further debugging why the insn was not recognized ...
Ok, I spent today trying to solve this problem. Although I didn't succeed
in solving it properly, I did at least find a workaround for the one
instance.
I found that in the failing circumstance, neither of the two things being
compared fell into the "force copy" situation. I don't know whether that
is right or wrong, but at least I can detect whether a "force copy" was
done. If no force copy was done, I stop doing the short CLC and let
it do the CLCL instead. See below where I have introduced the "copy"
variable. Unfortunately it affects other things, ie good CLCs have been
converted into CLCL also, which is a shame. However, it may at least
mean the compiler doesn't have a bug as far as the end user is
concerned, ie it generates valid code.
I have a theory that if both displacements in the S-type (ie register plus
displacement) address are non-zero, that something fails. So the
next thing I will do is see if I can detect just that situation, and stop
it going into the CLC.
Some of these md constructs are beginning to make more sense. :-)
BFN. Paul.
;
; cmpmemsi instruction pattern(s).
;
(define_expand "cmpmemsi"
[(set (match_operand:SI 0 "general_operand" "")
(compare (match_operand:BLK 1 "general_operand" "")
(match_operand:BLK 2 "general_operand" "")))
(use (match_operand:SI 3 "general_operand" ""))
(use (match_operand:SI 4 "" ""))]
""
"
{
rtx op1, op2;
int copy = 0;
op1 = XEXP (operands[1], 0);
if (GET_CODE (op1) == REG
|| (GET_CODE (op1) == PLUS && GET_CODE (XEXP (op1, 0)) == REG
&& GET_CODE (XEXP (op1, 1)) == CONST_INT
&& (unsigned) INTVAL (XEXP (op1, 1)) < 4096))
{
op1 = operands[1];
}
else
{
op1 = gen_rtx_MEM (BLKmode, copy_to_mode_reg (SImode, op1));
copy = 1;
}
op2 = XEXP (operands[2], 0);
if (GET_CODE (op2) == REG
|| (GET_CODE (op2) == PLUS && GET_CODE (XEXP (op2, 0)) == REG
&& GET_CODE (XEXP (op2, 1)) == CONST_INT
&& (unsigned) INTVAL (XEXP (op2, 1)) < 4096))
{
op2 = operands[2];
}
else
{
op2 = gen_rtx_MEM (BLKmode, copy_to_mode_reg (SImode, op2));
copy = 1;
}
/* so long as at least one operand was copied, this seems safe */
if (copy &&
GET_CODE (operands[3]) == CONST_INT && INTVAL (operands[3]) < 256)
{
emit_insn (gen_rtx_PARALLEL (VOIDmode, gen_rtvec (2,
gen_rtx_SET (VOIDmode, operands[0],
gen_rtx_COMPARE (SImode, op1, op2)), /* was VOIDmode */
gen_rtx_USE (VOIDmode, operands[3]))));
}
else
{
/* implementation suggested by Richard Henderson <rth@cygnus.com>
*/
rtx reg1 = gen_reg_rtx (DImode);
rtx reg2 = gen_reg_rtx (DImode);
rtx result = operands[0];
rtx mem1 = operands[1];
rtx mem2 = operands[2];
rtx len = operands[3];
if (!CONSTANT_P (len))
len = force_reg (SImode, len);
/* Load up the address+length pairs. */
emit_insn (gen_rtx_CLOBBER (VOIDmode, reg1));
emit_move_insn (gen_rtx_SUBREG (SImode, reg1, 0),
force_operand (XEXP (mem1, 0), NULL_RTX));
emit_move_insn (gen_rtx_SUBREG (SImode, reg1, GET_MODE_SIZE
(SImode)), len);
emit_insn (gen_rtx_CLOBBER (VOIDmode, reg2));
emit_move_insn (gen_rtx_SUBREG (SImode, reg2, 0),
force_operand (XEXP (mem2, 0), NULL_RTX));
emit_move_insn (gen_rtx_SUBREG (SImode, reg2, GET_MODE_SIZE
(SImode)), len);
/* Compare! */
emit_insn (gen_cmpmemsi_1 (result, reg1, reg2));
}
DONE;
}")
; Compare a block that is less than 256 bytes in length.
(define_insn ""
[(set (match_operand:SI 0 "register_operand" "=d")
(compare:SI (match_operand:BLK 1 "s_operand" "m")
(match_operand:BLK 2 "s_operand" "m")))
(use (match_operand:QI 3 "immediate_operand" "I"))]
"((unsigned) INTVAL (operands[3]) < 256)"
"*
{
check_label_emit ();
mvs_check_page (0, 22, 0);
return \"CLC %O1(%c3,%R1),%2\;BH *+12\;BL *+6\;SLR %0,%0\;LNR %0,%0\";
}"
[(set_attr "length" "22")]
)
; Compare a block that is larger than 255 bytes in length.
; (mem:BLK (subreg:SI (match_operand:DI 1 "register_operand" "+d")
0))
; (mem:BLK (subreg:SI (match_operand:DI 2 "register_operand" "+d")
0))))
(define_insn "cmpmemsi_1"
[(set (match_operand:SI 0 "register_operand" "+d")
(compare:SI
(mem:BLK (match_operand:DI 1 "register_operand" "+d") )
(mem:BLK (match_operand:DI 2 "register_operand" "+d") )))
(use (match_dup 1))
(use (match_dup 2))
(clobber (match_dup 1))
(clobber (match_dup 2))]
""
"*
{
check_label_emit ();
mvs_check_page (0, 18, 0);
return \"LA %0,1(0,0)\;CLCL %1,%2\;BH *+12\;BL *+6\;SLR %0,%0\;LNR
%0,%0\";
}"
[(set_attr "length" "18")]
)
next prev parent reply other threads:[~2009-09-19 12:57 UTC|newest]
Thread overview: 162+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-09 22:33 Paul Edwards
2009-09-14 15:42 ` Ulrich Weigand
2009-09-15 12:59 ` Paul Edwards
2009-09-15 13:51 ` Ulrich Weigand
2009-09-17 13:00 ` Paul Edwards
2009-09-17 17:55 ` Ulrich Weigand
2009-09-18 0:35 ` Paul Edwards
2009-09-18 12:06 ` Ulrich Weigand
2009-09-18 12:23 ` Paul Edwards
2009-09-18 13:27 ` Ulrich Weigand
2009-09-18 13:42 ` Paul Edwards
2009-09-18 16:08 ` Ulrich Weigand
2009-09-19 12:57 ` Paul Edwards [this message]
2009-09-25 10:19 ` Paul Edwards
2009-09-25 15:20 ` Ulrich Weigand
2009-09-30 17:24 ` i370 port - constructing compile script Paul Edwards
2009-09-30 17:36 ` Richard Henderson
2009-09-30 21:40 ` Paul Edwards
[not found] ` <mcrpr98x9w8.fsf@dhcp-172-17-9-151.mtv.corp.google.com>
2009-10-01 0:16 ` Joseph S. Myers
2009-10-01 14:00 ` Paul Edwards
2009-10-02 12:41 ` Paul Edwards
2009-10-02 16:00 ` Ian Lance Taylor
2009-10-02 22:53 ` Paul Edwards
2009-10-04 4:11 ` Ian Lance Taylor
2009-10-04 5:14 ` Paul Edwards
2009-10-04 6:04 ` Ian Lance Taylor
2009-10-04 6:50 ` Paul Edwards
2009-10-04 15:38 ` Ulrich Weigand
2009-10-04 22:51 ` Paul Edwards
2009-10-05 13:15 ` Ulrich Weigand
2009-10-06 9:32 ` Paul Edwards
2009-10-06 13:15 ` Ulrich Weigand
2009-10-06 13:38 ` Paul Edwards
2009-10-06 14:01 ` Ulrich Weigand
2009-10-14 14:33 ` Paul Edwards
2009-10-19 14:19 ` Paul Edwards
2009-10-19 17:37 ` Ulrich Weigand
2009-10-20 14:18 ` Paul Edwards
2009-10-20 15:30 ` Ulrich Weigand
2009-11-12 14:03 ` Paul Edwards
2009-11-12 20:06 ` Ralf Wildenhues
2009-11-12 20:56 ` Paul Edwards
2009-11-13 11:43 ` Paul Edwards
2009-11-13 12:01 ` Ulrich Weigand
2009-11-13 12:18 ` Paul Edwards
2009-11-13 12:57 ` Ulrich Weigand
2009-11-14 8:52 ` Paul Edwards
2009-11-14 10:49 ` Ralf Wildenhues
2009-11-14 11:28 ` Paul Edwards
2009-11-22 0:51 ` Paolo Bonzini
2009-11-18 10:51 ` Paul Edwards
2009-11-19 14:27 ` Ulrich Weigand
2009-11-21 13:40 ` Paul Edwards
2009-11-23 10:33 ` i370 port - 3.4.6 to 4.4 upgrade attempt Paul Edwards
2009-11-23 10:43 ` Andreas Schwab
2009-11-23 15:43 ` Paolo Bonzini
2009-11-24 14:05 ` Ulrich Weigand
2009-11-24 14:36 ` Paul Edwards
2009-11-28 15:14 ` i370 port - music/sp - possible generic gcc problem Paul Edwards
2009-11-28 16:03 ` Richard Guenther
2009-11-28 16:35 ` Paul Edwards
2009-11-28 17:03 ` Richard Guenther
2009-11-28 23:44 ` Paul Edwards
2010-05-26 14:40 ` i370 port - status Paul Edwards
2021-03-14 5:55 ` negative indexes Paul Edwards
2021-03-14 8:05 ` Richard Biener
2021-03-14 8:12 ` Paul Edwards
2021-03-14 13:37 ` Richard Biener
[not found] ` <755065BE2A0B4B508DD3A262B2A83801@DESKTOP0OKG1VA>
2021-03-15 9:22 ` Richard Biener
2021-03-15 13:55 ` extended segments on 80386 Paul Edwards
2009-12-07 12:05 ` i370 port - 3.4.6 to 4.4 upgrade attempt Paul Edwards
2009-12-08 13:55 ` Ulrich Weigand
2009-11-15 14:22 ` i370 port - finally building Paul Edwards
2009-11-22 0:46 ` i370 port - constructing compile script Paolo Bonzini
2009-11-13 12:08 ` Ulrich Weigand
2009-10-05 13:17 ` Michael Matz
2009-10-05 13:38 ` Paul Edwards
2009-10-05 13:46 ` Michael Matz
2009-10-01 14:28 ` Paul Brook
2009-10-01 16:00 ` Paul Edwards
2009-10-01 18:36 ` Ian Lance Taylor
2009-10-01 23:43 ` Paul Edwards
2009-10-01 21:10 ` David Edelsohn
2009-10-01 22:22 ` Toon Moene
2009-10-02 0:19 ` Paul Edwards
2009-11-04 5:21 ` i370 port Paul Edwards
2009-11-04 16:47 ` Ulrich Weigand
2009-11-09 14:55 ` Paul Edwards
2009-11-09 15:57 ` Ian Lance Taylor
2009-11-09 23:10 ` Paul Edwards
2009-11-10 14:58 ` Paul Edwards
2009-11-10 15:36 ` Ian Lance Taylor
2009-11-10 15:51 ` Paul Edwards
2009-11-10 15:56 ` Ian Lance Taylor
2009-12-02 22:03 ` Paul Edwards
2011-08-13 8:34 ` Paul Edwards
2011-08-15 14:32 ` Ulrich Weigand
2011-08-15 15:26 ` Paul Edwards
2011-08-15 17:23 ` Ulrich Weigand
2011-08-16 11:20 ` Paul Edwards
2011-08-16 13:26 ` Ulrich Weigand
2011-08-18 12:15 ` Paul Edwards
2011-08-18 13:14 ` Ulrich Weigand
2011-08-18 14:18 ` Paul Edwards
-- strict thread matches above, loose matches on Subject: below --
2014-02-13 4:23 Paul Edwards
2012-04-07 5:45 Paul Edwards
2012-04-08 17:43 ` Ulrich Weigand
2014-02-11 17:01 ` Paul Edwards
2012-04-06 12:49 Paul Edwards
2012-04-06 18:16 ` Ulrich Weigand
2012-04-07 4:12 ` Paul Edwards
2012-04-06 5:51 Paul Edwards
2011-08-20 12:15 Paul Edwards
2011-08-22 12:23 ` Ulrich Weigand
2012-04-05 13:32 ` Paul Edwards
2012-04-06 18:13 ` Ulrich Weigand
2011-08-20 10:09 Paul Edwards
2011-08-20 7:44 Paul Edwards
2009-09-22 12:31 Paul Edwards
2009-08-23 8:50 Paul Edwards
2009-08-26 22:13 ` Henrik Sorensen
2009-06-05 12:45 Paul Edwards
2009-06-05 14:33 ` Joseph S. Myers
2009-06-05 14:57 ` Paul Edwards
2009-06-05 15:03 ` Joseph S. Myers
2009-06-05 15:24 ` Paul Edwards
2009-06-05 15:47 ` Joseph S. Myers
2017-03-31 10:34 ` Paul Edwards
2009-09-12 12:41 ` Paul Edwards
2009-06-05 15:21 ` Ulrich Weigand
2009-06-05 15:39 ` Paul Edwards
2009-06-05 15:49 ` Daniel Jacobowitz
2009-06-05 15:57 ` Paul Edwards
2009-06-05 20:20 ` Joseph S. Myers
2009-06-05 20:45 ` Paul Edwards
2009-06-06 15:00 ` Paul Edwards
2009-06-15 17:46 ` Ulrich Weigand
2009-06-19 0:06 ` Paul Edwards
2009-06-19 12:28 ` Ulrich Weigand
2009-07-18 11:28 ` Paul Edwards
2009-07-20 14:27 ` Ulrich Weigand
2009-08-08 12:04 ` Paul Edwards
2009-08-10 21:25 ` Ulrich Weigand
2009-08-11 0:34 ` Paul Edwards
2009-08-11 15:21 ` Ulrich Weigand
2009-08-12 11:52 ` Paul Edwards
2009-08-12 15:27 ` Paolo Bonzini
2009-08-12 16:35 ` Ulrich Weigand
2009-08-12 17:27 ` Paul Edwards
2009-08-12 17:56 ` Paolo Bonzini
2009-08-12 19:46 ` Ulrich Weigand
2009-08-12 20:31 ` Paul Edwards
2009-08-19 12:07 ` Paul Edwards
2009-08-19 12:27 ` Paolo Bonzini
2009-08-20 12:49 ` Paul Edwards
2009-08-20 22:48 ` Ulrich Weigand
2009-08-21 2:37 ` Paul Edwards
2009-08-21 16:46 ` Ulrich Weigand
2009-06-05 15:44 ` Joseph S. Myers
2009-06-05 15:52 ` Paul Edwards
2009-09-08 15:55 ` Paul Edwards
2009-09-14 15:32 ` Ulrich Weigand
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