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* [Bug tree-optimization/56195] New: Error: incorrect register `%rdi' used with `l' suffix (at -O2)
@ 2013-02-03 16:48 antoine.balestrat at gmail dot com
2013-02-03 21:02 ` [Bug tree-optimization/56195] [4.8 Regression] " jakub at gcc dot gnu.org
` (9 more replies)
0 siblings, 10 replies; 11+ messages in thread
From: antoine.balestrat at gmail dot com @ 2013-02-03 16:48 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195
Bug #: 56195
Summary: Error: incorrect register `%rdi' used with `l' suffix
(at -O2)
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: antoine.balestrat@gmail.com
Using GCC 4.8.0 as of 20130203 :
$ xgcc -v
Using built-in specs.
COLLECT_GCC=/home/merkil/gcc/dist/bin/gcc
COLLECT_LTO_WRAPPER=/home/merkil/gcc/dist/libexec/gcc/x86_64-unknown-linux-gnu/4.8.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../srcdir/configure CFLAGS='-O2 -pipe' CXXFLAGS='-O2 -pipe'
--enable-languages=c --prefix=/home/merkil/gcc/dist
Thread model: posix
gcc version 4.8.0 20130203 (experimental) (GCC)
$ cat reg.c
int i, a, t, b, c, d, e, f, j, *h;
void fn(void)
{
if(b)
{
int *p, *q;
char g;
if(f++)
for(;; e++);
lbl:
for(b = 0; b < 2; b++)
t /= d + 1 ? : i || a < c < (d = f) ? : 1 | (j = 2);
*p = g >= *q ^ c != a ^ *p;
if(!e)
{
q = p;
goto lbl;
}
}
if(h++)
goto lbl;
}
$ xgcc -O2 reg.c
{standard input}: Assembler messages:
{standard input}:112: Error: incorrect register `%rdi' used with `l' suffix
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/56195] [4.8 Regression] Error: incorrect register `%rdi' used with `l' suffix (at -O2)
2013-02-03 16:48 [Bug tree-optimization/56195] New: Error: incorrect register `%rdi' used with `l' suffix (at -O2) antoine.balestrat at gmail dot com
@ 2013-02-03 21:02 ` jakub at gcc dot gnu.org
2013-02-04 9:41 ` rguenth at gcc dot gnu.org
` (8 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-03 21:02 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |vmakarov at gcc dot gnu.org
Target Milestone|--- |4.8.0
Summary|Error: incorrect register |[4.8 Regression] Error:
|`%rdi' used with `l' suffix |incorrect register `%rdi'
|(at -O2) |used with `l' suffix (at
| |-O2)
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-03 21:01:59 UTC ---
Started with LRA merge (
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=192719 ).
(define_insn "*cmp<mode>_1"
[(set (reg FLAGS_REG)
(compare (match_operand:SWI 0 "nonimmediate_operand" "<r>m,<r>")
(match_operand:SWI 1 "<general_operand>" "<r><i>,<r>m")))]
"ix86_match_ccmode (insn, CCmode)"
"cmp{<imodesuffix>}\t{%1, %0|%0, %1}"
[(set_attr "type" "icmp")
(set_attr "mode" "<MODE>")])
In *.ira dump the insn looks still correct:
(insn 90 87 91 22 (set (reg:CCGC 17 flags)
(compare:CCGC (reg:SI 118 [ D.1797 ])
(mem:SI (reg/v/f:DI 59 [ q ]) [2 *q_1+0 S4 A32]))) pr56195.c:17 7
{*cmpsi_1}
(nil))
but in *.reload dump:
(insn 90 256 91 22 (set (reg:CCGC 17 flags)
(compare:CCGC (reg:DI 5 di [137])
(mem:SI (reg:DI 5 di [137]) [2 *q_1+0 S4 A32]))) pr56195.c:17 7
{*cmpsi_1}
(expr_list:REG_DEAD (reg:DI 5 di [137])
(nil)))
so I wonder how could it match that way and survive till end of compilation.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/56195] [4.8 Regression] Error: incorrect register `%rdi' used with `l' suffix (at -O2)
2013-02-03 16:48 [Bug tree-optimization/56195] New: Error: incorrect register `%rdi' used with `l' suffix (at -O2) antoine.balestrat at gmail dot com
2013-02-03 21:02 ` [Bug tree-optimization/56195] [4.8 Regression] " jakub at gcc dot gnu.org
@ 2013-02-04 9:41 ` rguenth at gcc dot gnu.org
2013-02-05 13:57 ` jakub at gcc dot gnu.org
` (7 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-02-04 9:41 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-*
Priority|P3 |P1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-02-04
Ever Confirmed|0 |1
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/56195] [4.8 Regression] Error: incorrect register `%rdi' used with `l' suffix (at -O2)
2013-02-03 16:48 [Bug tree-optimization/56195] New: Error: incorrect register `%rdi' used with `l' suffix (at -O2) antoine.balestrat at gmail dot com
2013-02-03 21:02 ` [Bug tree-optimization/56195] [4.8 Regression] " jakub at gcc dot gnu.org
2013-02-04 9:41 ` rguenth at gcc dot gnu.org
@ 2013-02-05 13:57 ` jakub at gcc dot gnu.org
2013-02-05 16:40 ` jakub at gcc dot gnu.org
` (6 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-05 13:57 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-05 13:56:56 UTC ---
Seems this is heavily related to the uninitialized uses, in
(insn 90 87 91 22 (set (reg:CCGC 17 flags)
(compare:CCGC (reg:SI 118 [ D.1797 ])
(mem:SI (reg/v/f:DI 59 [ q ]) [2 *q_1+0 S4 A32]))) pr56195.c:17 7
{*cmpsi_1}
(nil))
both SI 118 and DI 59 pseudos are preinitialized to const0_rtx because both the
address to read from and the other value are uninitialized. Guess LRA figures
out that both operands are equal to const0_rtx, just doesn't handle the
different modes properly (it can be cmpl (%rdi), %edi ).
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/56195] [4.8 Regression] Error: incorrect register `%rdi' used with `l' suffix (at -O2)
2013-02-03 16:48 [Bug tree-optimization/56195] New: Error: incorrect register `%rdi' used with `l' suffix (at -O2) antoine.balestrat at gmail dot com
` (2 preceding siblings ...)
2013-02-05 13:57 ` jakub at gcc dot gnu.org
@ 2013-02-05 16:40 ` jakub at gcc dot gnu.org
2013-02-07 19:25 ` [Bug rtl-optimization/56195] " vmakarov at redhat dot com
` (5 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-05 16:40 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-05 16:40:17 UTC ---
I'd say the bug is in get_reload_reg.
Changing pseudo 118 in operand 0 of insn 90 on equiv 0
Changing address in insn 90 r59:DI -- no change
Changing pseudo 59 in address of insn 90 on equiv 0
Creating newreg=137, assigning class GENERAL_REGS to address r137
Choosing alt 1 in insn 90: (0) r (1) rm
Reuse r137 for reload 0, change to class INDEX_REGS for r137
90: flags:CCGC=cmp(r137:DI,[r137:DI])
Inserting insn reload before:
256: r137:DI=0
3065 if (get_reload_reg (type, mode, old, goal_alt[i], "", &new_reg)
3066 && type != OP_OUT)
calls it with
type=OP_IN, mode=SImode, original=const0_rtx, rclass=GENERAL_REGS
but returns new_reg = (reg:DI 137).
That is because:
if (rtx_equal_p (curr_insn_input_reloads[i].input, original)
&& in_class_p (curr_insn_input_reloads[i].reg, rclass, &new_class))
doesn't check any mode if original (and curr_insn_input_reloads[i].input) are
VOIDmode as in this case. So, either this can be fixed by doing:
if (rtx_equal_p (curr_insn_input_reloads[i].input, original)
- && in_class_p (curr_insn_input_reloads[i].reg, rclass, &new_class))
+ && in_class_p (curr_insn_input_reloads[i].reg, rclass, &new_class)
+ && GET_MODE (curr_insn_input_reloads[i].reg) == mode)
, or we could try better, if the GET_MODE (curr_insn_input_reloads[i].reg)
is wider than mode, see if we can create a lowpart subreg thereof and return
that, and only give up (i.e. continue looping) if creation of the lowpart
subreg for some reason failed.
Vlad, what do you think?
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug rtl-optimization/56195] [4.8 Regression] Error: incorrect register `%rdi' used with `l' suffix (at -O2)
2013-02-03 16:48 [Bug tree-optimization/56195] New: Error: incorrect register `%rdi' used with `l' suffix (at -O2) antoine.balestrat at gmail dot com
` (3 preceding siblings ...)
2013-02-05 16:40 ` jakub at gcc dot gnu.org
@ 2013-02-07 19:25 ` vmakarov at redhat dot com
2013-02-07 19:47 ` jakub at gcc dot gnu.org
` (4 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: vmakarov at redhat dot com @ 2013-02-07 19:25 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195
Vladimir Makarov <vmakarov at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |vmakarov at redhat dot com
--- Comment #4 from Vladimir Makarov <vmakarov at redhat dot com> 2013-02-07 19:24:58 UTC ---
(In reply to comment #3)
> I'd say the bug is in get_reload_reg.
> Changing pseudo 118 in operand 0 of insn 90 on equiv 0
> Changing address in insn 90 r59:DI -- no change
> Changing pseudo 59 in address of insn 90 on equiv 0
> Creating newreg=137, assigning class GENERAL_REGS to address r137
> Choosing alt 1 in insn 90: (0) r (1) rm
> Reuse r137 for reload 0, change to class INDEX_REGS for r137
> 90: flags:CCGC=cmp(r137:DI,[r137:DI])
> Inserting insn reload before:
> 256: r137:DI=0
>
>
> 3065 if (get_reload_reg (type, mode, old, goal_alt[i], "", &new_reg)
> 3066 && type != OP_OUT)
>
> calls it with
> type=OP_IN, mode=SImode, original=const0_rtx, rclass=GENERAL_REGS
> but returns new_reg = (reg:DI 137).
> That is because:
> if (rtx_equal_p (curr_insn_input_reloads[i].input, original)
> && in_class_p (curr_insn_input_reloads[i].reg, rclass, &new_class))
> doesn't check any mode if original (and curr_insn_input_reloads[i].input) are
> VOIDmode as in this case. So, either this can be fixed by doing:
> if (rtx_equal_p (curr_insn_input_reloads[i].input, original)
> - && in_class_p (curr_insn_input_reloads[i].reg, rclass, &new_class))
> + && in_class_p (curr_insn_input_reloads[i].reg, rclass, &new_class)
> + && GET_MODE (curr_insn_input_reloads[i].reg) == mode)
> , or we could try better, if the GET_MODE (curr_insn_input_reloads[i].reg)
> is wider than mode, see if we can create a lowpart subreg thereof and return
> that, and only give up (i.e. continue looping) if creation of the lowpart
> subreg for some reason failed.
>
> Vlad, what do you think?
I think, the second solution with lowpart is better.
Would you like to make a patch or may be you prefer that I work on it?
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug rtl-optimization/56195] [4.8 Regression] Error: incorrect register `%rdi' used with `l' suffix (at -O2)
2013-02-03 16:48 [Bug tree-optimization/56195] New: Error: incorrect register `%rdi' used with `l' suffix (at -O2) antoine.balestrat at gmail dot com
` (4 preceding siblings ...)
2013-02-07 19:25 ` [Bug rtl-optimization/56195] " vmakarov at redhat dot com
@ 2013-02-07 19:47 ` jakub at gcc dot gnu.org
2013-02-07 20:03 ` jakub at gcc dot gnu.org
` (3 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-07 19:47 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-07 19:47:04 UTC ---
So something like:
--- lra-constraints.c.jj 2013-02-07 18:34:39.000000000 +0100
+++ lra-constraints.c 2013-02-07 20:41:17.051986353 +0100
@@ -421,7 +421,21 @@ get_reload_reg (enum op_type type, enum
if (rtx_equal_p (curr_insn_input_reloads[i].input, original)
&& in_class_p (curr_insn_input_reloads[i].reg, rclass, &new_class))
{
- *result_reg = curr_insn_input_reloads[i].reg;
+ rtx reg = curr_insn_input_reloads[i].reg;
+ /* If input is equal to original and both are VOIDmode,
+ GET_MODE (reg) might be still different from mode.
+ Ensure we don't return *result_reg with wrong mode. */
+ if (GET_MODE (reg) != mode)
+ {
+ if (GET_MODE_SIZE (GET_MODE (reg)) < GET_MODE_SIZE (mode))
+ continue;
+ reg = simplify_subreg (mode, reg, GET_MODE (reg),
+ subreg_lowpart_offset (mode,
+ GET_MODE (reg)));
+ if (reg == NULL_RTX || !REG_P (reg))
+ continue;
+ }
+ *result_reg = reg;
regno = REGNO (*result_reg);
if (lra_dump_file != NULL)
{
?
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug rtl-optimization/56195] [4.8 Regression] Error: incorrect register `%rdi' used with `l' suffix (at -O2)
2013-02-03 16:48 [Bug tree-optimization/56195] New: Error: incorrect register `%rdi' used with `l' suffix (at -O2) antoine.balestrat at gmail dot com
` (5 preceding siblings ...)
2013-02-07 19:47 ` jakub at gcc dot gnu.org
@ 2013-02-07 20:03 ` jakub at gcc dot gnu.org
2013-02-07 20:09 ` vmakarov at redhat dot com
` (2 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-07 20:03 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-07 20:02:20 UTC ---
Actually, that one doesn't really work, because we have pseudo rather than hard
reg at that point, which will never simplify.
With this:
--- lra-constraints.c.jj 2013-02-07 18:34:39.000000000 +0100
+++ lra-constraints.c 2013-02-07 20:58:25.558920536 +0100
@@ -421,8 +421,20 @@ get_reload_reg (enum op_type type, enum
if (rtx_equal_p (curr_insn_input_reloads[i].input, original)
&& in_class_p (curr_insn_input_reloads[i].reg, rclass, &new_class))
{
- *result_reg = curr_insn_input_reloads[i].reg;
- regno = REGNO (*result_reg);
+ rtx reg = curr_insn_input_reloads[i].reg;
+ regno = REGNO (reg);
+ /* If input is equal to original and both are VOIDmode,
+ GET_MODE (reg) might be still different from mode.
+ Ensure we don't return *result_reg with wrong mode. */
+ if (GET_MODE (reg) != mode)
+ {
+ if (GET_MODE_SIZE (GET_MODE (reg)) < GET_MODE_SIZE (mode))
+ continue;
+ reg = lowpart_subreg (mode, reg, GET_MODE (reg));
+ if (reg == NULL_RTX || GET_CODE (reg) != SUBREG)
+ continue;
+ }
+ *result_reg = reg;
if (lra_dump_file != NULL)
{
fprintf (lra_dump_file, " Reuse r%d for reload ", regno);
the assembly difference is:
- cmpl (%rdi), %rdi
+ cmpl (%rdi), %edi
which is desirable in this case, but not sure if all get_reload_reg callers
will grok a SUBREG instead of REG returned in *result_reg.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug rtl-optimization/56195] [4.8 Regression] Error: incorrect register `%rdi' used with `l' suffix (at -O2)
2013-02-03 16:48 [Bug tree-optimization/56195] New: Error: incorrect register `%rdi' used with `l' suffix (at -O2) antoine.balestrat at gmail dot com
` (6 preceding siblings ...)
2013-02-07 20:03 ` jakub at gcc dot gnu.org
@ 2013-02-07 20:09 ` vmakarov at redhat dot com
2013-02-08 15:19 ` jakub at gcc dot gnu.org
2013-02-08 15:25 ` jakub at gcc dot gnu.org
9 siblings, 0 replies; 11+ messages in thread
From: vmakarov at redhat dot com @ 2013-02-07 20:09 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195
--- Comment #7 from Vladimir Makarov <vmakarov at redhat dot com> 2013-02-07 20:08:47 UTC ---
(In reply to comment #6)
> Actually, that one doesn't really work, because we have pseudo rather than hard
> reg at that point, which will never simplify.
>
> With this:
>
> --- lra-constraints.c.jj 2013-02-07 18:34:39.000000000 +0100
> +++ lra-constraints.c 2013-02-07 20:58:25.558920536 +0100
> @@ -421,8 +421,20 @@ get_reload_reg (enum op_type type, enum
> if (rtx_equal_p (curr_insn_input_reloads[i].input, original)
> && in_class_p (curr_insn_input_reloads[i].reg, rclass, &new_class))
> {
> - *result_reg = curr_insn_input_reloads[i].reg;
> - regno = REGNO (*result_reg);
> + rtx reg = curr_insn_input_reloads[i].reg;
> + regno = REGNO (reg);
> + /* If input is equal to original and both are VOIDmode,
> + GET_MODE (reg) might be still different from mode.
> + Ensure we don't return *result_reg with wrong mode. */
> + if (GET_MODE (reg) != mode)
> + {
> + if (GET_MODE_SIZE (GET_MODE (reg)) < GET_MODE_SIZE (mode))
> + continue;
> + reg = lowpart_subreg (mode, reg, GET_MODE (reg));
> + if (reg == NULL_RTX || GET_CODE (reg) != SUBREG)
> + continue;
> + }
> + *result_reg = reg;
> if (lra_dump_file != NULL)
> {
> fprintf (lra_dump_file, " Reuse r%d for reload ", regno);
>
> the assembly difference is:
>
> - cmpl (%rdi), %rdi
> + cmpl (%rdi), %edi
>
> which is desirable in this case, but not sure if all get_reload_reg callers
> will grok a SUBREG instead of REG returned in *result_reg.
This version of patch looks ok for me. I have no worry about get_reload_reg
callers. It should work fine (that is a difference from reload pass when you
should care about secondary reloads etc).
Thanks for working on this, Jakub,
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug rtl-optimization/56195] [4.8 Regression] Error: incorrect register `%rdi' used with `l' suffix (at -O2)
2013-02-03 16:48 [Bug tree-optimization/56195] New: Error: incorrect register `%rdi' used with `l' suffix (at -O2) antoine.balestrat at gmail dot com
` (7 preceding siblings ...)
2013-02-07 20:09 ` vmakarov at redhat dot com
@ 2013-02-08 15:19 ` jakub at gcc dot gnu.org
2013-02-08 15:25 ` jakub at gcc dot gnu.org
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-08 15:19 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-08 15:19:05 UTC ---
Author: jakub
Date: Fri Feb 8 15:19:02 2013
New Revision: 195891
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=195891
Log:
PR rtl-optimization/56195
* lra-constraints.c (get_reload_reg): Don't reuse regs
if they have smaller mode than requested, if they have
wider mode than requested, try to return a SUBREG.
* gcc.dg/torture/pr56195.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr56195.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/lra-constraints.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug rtl-optimization/56195] [4.8 Regression] Error: incorrect register `%rdi' used with `l' suffix (at -O2)
2013-02-03 16:48 [Bug tree-optimization/56195] New: Error: incorrect register `%rdi' used with `l' suffix (at -O2) antoine.balestrat at gmail dot com
` (8 preceding siblings ...)
2013-02-08 15:19 ` jakub at gcc dot gnu.org
@ 2013-02-08 15:25 ` jakub at gcc dot gnu.org
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-08 15:25 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
AssignedTo|unassigned at gcc dot |jakub at gcc dot gnu.org
|gnu.org |
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-08 15:24:40 UTC ---
Fixed.
^ permalink raw reply [flat|nested] 11+ messages in thread
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