[Bug rtl-optimization/61446] New: [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[Bug rtl-optimization/61446] New: [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

            Bug ID: 61446
           Summary: [4.10 Regression]: ICE in copyprop_hardreg_forward_1,
                    at regcprop.c with -O2 -m32 -march=corei7
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ubizjak at gmail dot com

Following testcase:

--cut here--
unsigned long long
__fixunssfdi (float a)
{
  const double dfa = a;
  const unsigned int hi = dfa / 0x1p32f;
  const unsigned int lo = dfa - (double) hi * 0x1p32f;

  return ((unsigned long long) hi << (4 * (8))) | lo;
}
--cut here--

ICEs on x86_64-pc-linux-gnu with "-O2 -m32 -march=corei7":

./cc1 -O2 -m32 -march=corei7 ree.c
 __fixunssfdi
Analyzing compilation unit
Performing interprocedural optimizations
 <*free_lang_data> <visibility> <early_local_cleanups> <*free_inline_summary>
<whole-program> <profile_estimate> <devirt> <cp> <inline> <pure-const>
<static-var> <comdats>Assembling functions:
 __fixunssfdi
ree.c: In function ‘__fixunssfdi’:
ree.c:11:1: error: insn does not satisfy its constraints:
 }
 ^
(insn 54 11 47 2 (set (reg:DI 0 ax)
        (reg:DI 21 xmm0)) ree.c:7 89 {*movdi_internal}
     (expr_list:REG_UNUSED (reg:DI 0 ax)
        (nil)))
ree.c:11:1: internal compiler error: in copyprop_hardreg_forward_1, at
regcprop.c:776
0x96bec8 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/uros/gcc-svn/trunk/gcc/rtl-error.c:109
0x96beef _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/uros/gcc-svn/trunk/gcc/rtl-error.c:120
0x9462a4 copyprop_hardreg_forward_1
        /home/uros/gcc-svn/trunk/gcc/regcprop.c:776
0x94645a execute
        /home/uros/gcc-svn/trunk/gcc/regcprop.c:1264
Please submit a full bug report,
...

_.split2 pass generates:

...
(insn 11 45 46 2 (set (reg/v:SI 0 ax [orig:85 hi ] [85])
        (reg:SI 2 cx [99])) ree.c:7 90 {*movsi_internal}
     (nil))
(insn 46 11 47 2 (set (reg:DI 21 xmm0 [118])
        (zero_extend:DI (reg/v:SI 0 ax [orig:85 hi ] [85]))) ree.c:10 133
{*zero_extendsidi2}
     (nil))
(insn 47 46 48 2 (set (mem/c:DI (reg/f:SI 7 sp) [0  S8 A64])
        (reg:DI 21 xmm0 [118])) ree.c:10 89 {*movdi_internal}
     (nil))
(insn 48 47 13 2 (set (reg:DF 9 st(1) [orig:101 D.1856 ] [101])
        (float:DF (mem/c:DI (reg/f:SI 7 sp) [0  S8 A64]))) ree.c:10 206
{*floatdidf2_i387}
     (nil))
...


and this sequence is transformed in _.ree pass to:

...
(insn 11 45 54 2 (set (reg:DI 21 xmm0)
        (zero_extend:DI (reg:SI 2 cx [99]))) ree.c:7 133 {*zero_extendsidi2}
     (nil))
(insn 54 11 47 2 (set (reg:DI 0 ax)
        (reg:DI 21 xmm0)) ree.c:7 -1
     (nil))
(insn 47 54 48 2 (set (mem/c:DI (reg/f:SI 7 sp) [0  S8 A64])
        (reg:DI 21 xmm0 [118])) ree.c:10 89 {*movdi_internal}
     (nil))
(insn 48 47 13 2 (set (reg:DF 9 st(1) [orig:101 D.1856 ] [101])
        (float:DF (mem/c:DI (reg/f:SI 7 sp) [0  S8 A64]))) ree.c:10 206
{*floatdidf2_i387}
     (nil))
...


(insn 54) is the problematic instruction.
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Subject: [Bug rtl-optimization/61446] [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |i686
             Blocks|                            |61423
   Target Milestone|---                         |4.10.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61423

--- Comment #8 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Uroš Bizjak from comment #5)
> Created attachment 32903 [details]
> Testcase that fails in REE pass
> 
> This testcase fails with patched gcc in REE pass:

This is now PR61446.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida444

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-06-08
     Ever confirmed|0                           |1
           Severity|normal                      |enhancement

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I can see one case where this would be useful: if you have a variable and you
have the same typo in two different places.

[Bug rtl-optimization/61446] [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-06-08
     Ever confirmed|0                           |1

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
This breaks bootstrap on x86_64-apple-darwin13 and other targets (see
https://gcc.gnu.org/ml/gcc-regression/2014-06/). On darwin the failure is

/opt/gcc/build_w/./gcc/xgcc -B/opt/gcc/build_w/./gcc/
-B/opt/gcc/gcc4.10w/x86_64-apple-darwin13.2.0/bin/
-B/opt/gcc/gcc4.10w/x86_64-apple-darwin13.2.0/lib/ -isystem
/opt/gcc/gcc4.10w/x86_64-apple-darwin13.2.0/include -isystem
/opt/gcc/gcc4.10w/x86_64-apple-darwin13.2.0/sys-include    -g -O2 -O2  -g -O2
-DIN_GCC    -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-format
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem
./include   -pipe -fno-common -g -DIN_LIBGCC2 -fbuilding-libgcc
-fno-stack-protector   -pipe -fno-common -I. -I. -I../.././gcc
-I../../../work/libgcc -I../../../work/libgcc/. -I../../../work/libgcc/../gcc
-I../../../work/libgcc/../include  -DHAVE_CC_TLS -DUSE_EMUTLS -o
_fixunssfti_s.o -MT _fixunssfti_s.o -MD -MP -MF _fixunssfti_s.dep -DSHARED
-DL_fixunsdfdi -c ../../../work/libgcc/libgcc2.c \
        -DLIBGCC2_UNITS_PER_WORD=8
../../../../work/libgcc/libgcc2.c: In function '__fixunssfdi':
../../../../work/libgcc/libgcc2.c:1492:1: error: insn does not satisfy its
constraints:
 }
 ^
(insn 60 13 14 2 (set (reg:DI 0 ax)
        (reg:DI 21 xmm0)) ../../../../work/libgcc/libgcc2.c:1444 89
{*movdi_internal}
     (expr_list:REG_UNUSED (reg:DI 0 ax)
        (nil)))
../../../../work/libgcc/libgcc2.c:1492:1: internal compiler error: in
copyprop_hardreg_forward_1, at regcprop.c:776

Reverting r211321 allowed me to bootstrap r211353 on x86_64-apple-darwin13.

[Bug rtl-optimization/61446] [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Dominique d'Humieres from comment #1)
> This breaks bootstrap on x86_64-apple-darwin13 and other targets (see
> https://gcc.gnu.org/ml/gcc-regression/2014-06/). On darwin the failure is

Yes, known problem. Please use following patch to disable REE pass for now:

Index: common/config/i386/i386-common.c
===================================================================
--- common/config/i386/i386-common.c    (revision 211321)
+++ common/config/i386/i386-common.c    (working copy)
@@ -866,7 +866,7 @@
 static const struct default_options ix86_option_optimization_table[] =
   {
     /* Enable redundant extension instructions removal at -O2 and higher.  */
-    { OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_free, NULL, 0 },
     /* Enable function splitting at -O2 and higher.  */
     { OPT_LEVELS_2_PLUS, OPT_freorder_blocks_and_partition, NULL, 1 },
     /* Turn off -fschedule-insns by default.  It tends to make the
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Subject: [Bug tree-optimization/61434] [4.10 Regression] wrong code at -O3 on x86_64-linux
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida434

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-06-08
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |kyukhin at gcc dot gnu.org
   Target Milestone|---                         |4.10.0
            Summary|wrong code at -O3 on        |[4.10 Regression] wrong
                   |x86_64-linux                |code at -O3 on x86_64-linux
     Ever confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r209972.

[Bug rtl-optimization/61446] [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
Proposed patch at [1].

[1] https://gcc.gnu.org/ml/gcc-patches/2014-06/msg00775.html
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Subject: [Bug middle-end/61456] Bogus "may be used uninitialized" warning
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61456

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-06-10
                 CC|                            |manu at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #3)
> >Note that there is no '__delta' in the original source, so the error message
> Well that is partly the front-end issue as it is pointer to member functions
> are implemented using a struct.

The FE should mark these compiler-generated declarations as artificial or some
such to avoid warning about them.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida334

Thomas Schwinge <tschwinge at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #7 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
Fixed in r211401.

[Bug rtl-optimization/61446] [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Proposed patch at [1].
>
> [1] https://gcc.gnu.org/ml/gcc-patches/2014-06/msg00775.html

This patch fixes bootstrap on Core* targets.

[Bug rtl-optimization/61446] [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
This pr has been exposed by revision r211321 and breaks bootstrap on all
targets configured for Core* (including darwin which is configured by default
for Core2, see pr61477).

[Bug rtl-optimization/61446] [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |juergen.reuter at desy dot de

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 61477 has been marked as a duplicate of this bug. ***

[Bug rtl-optimization/61446] [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

--- Comment #7 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Fri Jun 13 16:40:48 2014
New Revision: 211649

URL: https://gcc.gnu.org/viewcvs?rev=211649&root=gcc&view=rev
Log:
2014-06-13  Jeff Law  <law@redhat.com>

    PR rtl-optimization/61094
    PR rtl-optimization/61446
    * ree.c (combine_reaching_defs): Get the mode for the copy from
    the extension insn rather than the defining insn.

2014-06-13  Ilya Enkovich  <ilya.enkovich@intel.com>

    PR rtl-optimization/61094
    PR rtl-optimization/61446
    * gcc.target/i386/pr61446.c : New.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr61446.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/ree.c
    trunk/gcc/testsuite/ChangeLog

[Bug rtl-optimization/61446] [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |law at redhat dot com
         Resolution|---                         |FIXED

--- Comment #8 from Jeffrey A. Law <law at redhat dot com> ---
Should be fixed on the trunk with most recent checkin.

[Bug rtl-optimization/61446] [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

--- Comment #9 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Fri Jun 13 16:50:10 2014
New Revision: 211652

URL: https://gcc.gnu.org/viewcvs?rev=211652&root=gcc&view=rev
Log:
2014-06-13  Jeff Law  <law@redhat.com>

    PR rtl-optimization/61094
    PR rtl-optimization/61446
    * ree.c (combine_reaching_defs): Get the mode for the copy from
    the extension insn rather than the defining insn.

2014-06-13  Ilya Enkovich  <ilya.enkovich@intel.com>

    PR rtl-optimization/61094
    PR rtl-optimization/61446
    * gcc.target/i386/pr61446.c : New.

Added:
    branches/gcc-4_9-branch/gcc/testsuite/gcc.target/i386/pr61446.c
Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/ree.c
    branches/gcc-4_9-branch/gcc/testsuite/ChangeLog

[Bug rtl-optimization/61446] [4.10 Regression]: ICE in copyprop_hardreg_forward_1, at regcprop.c with -O2 -m32 -march=corei7

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61446

--- Comment #10 from uros at gcc dot gnu.org ---
Author: uros
Date: Wed Jun 18 20:01:37 2014
New Revision: 211803

URL: https://gcc.gnu.org/viewcvs?rev=211803&root=gcc&view=rev
Log:
    Backport from mainline
    2014-06-06  Uros Bizjak  <ubizjak@gmail.com>

    PR target/61423
    * config/i386/i386.md (*floatunssi<mode>2_i387_with_xmm): New
    define_insn_and_split pattern, merged from *floatunssi<mode>2_1
    and corresponding splitters.  Zero extend general register
    or memory input operand to XMM temporary.  Enable for
    TARGET_SSE2 and TARGET_INTER_UNIT_MOVES_TO_VEC only.
    (floatunssi<mode>2): Update expander predicate.

testsuite/ChangeLog:

    Backport from mainline
    2014-06-13  Ilya Enkovich  <ilya.enkovich@intel.com>

    PR rtl-optimization/61094
    PR rtl-optimization/61446
    * gcc.target/i386/pr61446.c : New.

    Backport from mainline
    2014-06-06  Uros Bizjak  <ubizjak@gmail.com>

    PR target/61423
    * gcc.target/i386/pr61423.c: New test.


Added:
    branches/gcc-4_8-branch/gcc/testsuite/gcc.target/i386/pr61423.c
    branches/gcc-4_8-branch/gcc/testsuite/gcc.target/i386/pr61446.c
Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/config/i386/i386.md
    branches/gcc-4_8-branch/gcc/testsuite/ChangeLog