[Bug c++/61794] New: internal error: unrecognizable insn, from avx512 extract instruction

[Bug c++/61794] New: internal error: unrecognizable insn, from avx512 extract instruction

[agner at agner dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61794

            Bug ID: 61794
           Summary: internal error: unrecognizable insn, from avx512
                    extract instruction
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: agner at agner dot org

Created attachment 33117
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33117&action=edit
c++ file producing error

The attached file bug1.cpp generates internal error when compiling:
g++ -mavx512f bug1.cpp

g++ version: 4.9 and 4.10.0 20140706
binutils version: 2.24
Ubuntu version: 12.04.2 LTS


Error message:
==============
a@a-desktop:~/avx512$ g++ -mavx512f bug1.cpp
bug1.cpp: In member function ‘int32_t Vec16i::extract(uint32_t) const’:
bug1.cpp:59:5: error: unrecognizable insn:
     }
     ^
(insn 29 28 30 8 (set (reg:V4SI 89 [ D.12727 ])
        (vec_merge:V4SI (vec_select:V4SI (reg:V16SI 88 [ D.12726 ])
                (parallel [
                        (const_int 0 [0])
                        (const_int 1 [0x1])
                        (const_int 2 [0x2])
                        (const_int 3 [0x3])
                    ]))
            (reg:V4SI 86 [ D.12724 ])
            (reg:QI 113))) bug1.cpp:38 -1
     (nil))
bug1.cpp:59:5: internal compiler error: in extract_insn, at recog.c:2204
0xb25c68 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
    ../.././gcc/rtl-error.c:109
0xb25c99 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
    ../.././gcc/rtl-error.c:117
0xaf609e extract_insn(rtx_def*)
    ../.././gcc/recog.c:2204
0x980803 instantiate_virtual_regs_in_insn
    ../.././gcc/function.c:1561
0x980803 instantiate_virtual_regs
    ../.././gcc/function.c:1932
0x980803 execute
    ../.././gcc/function.c:1983
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida615

Harald Anlauf <anlauf at gmx dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |anlauf at gmx dot de

--- Comment #3 from Harald Anlauf <anlauf at gmx dot de> ---
(In reply to Dominique d'Humieres from comment #2)
> I don't understand how the code in comment 0 can distinguish bar_s from
> bar_a1d based on the variable locations in memory,

TKR, i.e. rank in the present case?

> nor why it chooses bar_a1d.

Intel 14.2, NAG 5.3.2(951) and PGI 14.4-0 succeed with the original
testcase.

[Bug target/61794] internal error: unrecognizable insn, from avx512 extract instruction

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61794

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |ubizjak at gmail dot com

--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
Patch in testing:

--cut here--
Index: sse.md
===================================================================
--- sse.md      (revision 212778)
+++ sse.md      (working copy)
@@ -5892,9 +5892,10 @@
              (match_operand 5  "const_0_to_15_operand")]))
          (match_operand:<ssequartermode> 6 "memory_operand" "0")
          (match_operand:QI 7 "register_operand" "Yk")))]
-  "TARGET_AVX512F && (INTVAL (operands[2]) = INTVAL (operands[3]) - 1)
-  && (INTVAL (operands[3]) = INTVAL (operands[4]) - 1)
-  && (INTVAL (operands[4]) = INTVAL (operands[5]) - 1)"
+  "TARGET_AVX512F
+   && (INTVAL (operands[2]) == (INTVAL (operands[3]) - 1)
+       && INTVAL (operands[3]) == (INTVAL (operands[4]) - 1)
+       && INTVAL (operands[4]) == (INTVAL (operands[5]) - 1))"
 {
   operands[2] = GEN_INT ((INTVAL (operands[2])) >> 2);
   return "vextract<shuffletype>32x4\t{%2, %1, %0%{%7%}|%0%{%7%}, %1, %2}";
@@ -5914,9 +5915,10 @@
             (match_operand 3  "const_0_to_15_operand")
             (match_operand 4  "const_0_to_15_operand")
             (match_operand 5  "const_0_to_15_operand")])))]
-  "TARGET_AVX512F && (INTVAL (operands[2]) = INTVAL (operands[3]) - 1)
-  && (INTVAL (operands[3]) = INTVAL (operands[4]) - 1)
-  && (INTVAL (operands[4]) = INTVAL (operands[5]) - 1)"
+  "TARGET_AVX512F
+   && (INTVAL (operands[2]) == (INTVAL (operands[3]) - 1)
+       && INTVAL (operands[3]) == (INTVAL (operands[4]) - 1)
+       && INTVAL (operands[4]) == (INTVAL (operands[5]) - 1))"
 {
   operands[2] = GEN_INT ((INTVAL (operands[2])) >> 2);
   return "vextract<shuffletype>32x4\t{%2, %1,
%0<mask_operand6>|%0<mask_operand6>, %1, %2}";
--cut here--
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idB734

--- Comment #41 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Damien Buhl (daminetreg) from comment #40)
> I can also confirm the crash with gcc-4.8.1 for an arm platform.

You'll have to provide more information about your compilation, see
http://gcc.gnu.org/bugs.html

You might need to link with -latomic on arm (I'm not sure)

[Bug target/61794] internal error: unrecognizable insn, from avx512 extract instruction

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61794

--- Comment #3 from uros at gcc dot gnu.org ---
Author: uros
Date: Fri Jul 18 16:13:45 2014
New Revision: 212824

URL: https://gcc.gnu.org/viewcvs?rev=212824&root=gcc&view=rev
Log:
    PR target/61794
    * config/i386/sse.md (avx512f_vextract<shuffletype>32x4_1_maskm):
    Fix instruction constraint.
    (<mask_codefor>avx512f_vextract<shuffletype>32x4_1<mask_name>): Ditto.

testsuite/ChangeLog:

    PR target/61794
    * gcc.target/i386/pr61794.c: New test.


Added:
    trunk/gcc/testsuite/gcc.target/i386/pr61794.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/sse.md
    trunk/gcc/testsuite/ChangeLog

[Bug target/61794] internal error: unrecognizable insn, from avx512 extract instruction

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61794

--- Comment #4 from uros at gcc dot gnu.org ---
Author: uros
Date: Fri Jul 18 16:18:02 2014
New Revision: 212825

URL: https://gcc.gnu.org/viewcvs?rev=212825&root=gcc&view=rev
Log:
    Backport from mainline
    2014-07-18  Uros Bizjak  <ubizjak@gmail.com>

    PR target/61794
    * config/i386/sse.md (avx512f_vextract<shuffletype>32x4_1_maskm):
    Fix instruction constraint.
    (<mask_codefor>avx512f_vextract<shuffletype>32x4_1<mask_name>): Ditto.

testsuite/ChangeLog:

    Backport from mainline
    2014-07-18  Uros Bizjak  <ubizjak@gmail.com>

    PR target/61794
    * gcc.target/i386/pr61794.c: New test.


Added:
    branches/gcc-4_9-branch/gcc/testsuite/gcc.target/i386/pr61794.c
Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/config/i386/sse.md
    branches/gcc-4_9-branch/gcc/testsuite/ChangeLog

[Bug target/61794] internal error: unrecognizable insn, from avx512 extract instruction

[LpSolit at netscape dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61794

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|4.10.0                      |4.9.2

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
Fixed for 4.9.2+.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61840

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
So, a duplicate after all.

*** This bug has been marked as a duplicate of bug 59432 ***
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Subject: [Bug libgcc/61845] New: Minor build warnings for gcc-4.9.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida845

            Bug ID: 61845
           Summary: Minor build warnings for gcc-4.9.1
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgcc
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bdubbs at linuxfromscratch dot org

I would think that gcc would build itself cleanly.  The following warnings are
produced when building:

libgcc/config/libbid/bid64_div.c:523:51: warning: variable 'Ql' set but not
used
libgcc/config/libbid/bid64_div.c:937:51: warning: variable 'Ql' set but not
used
libgcc/config/libbid/bid64_div.c:1374:51: warning: variable 'Ql' set but not
used

libgcc/config/libbid/bid128_div.c:39:51: warning: variable 'Ql' set but not
used
libgcc/config/libbid/bid128_div.c:490:51: warning: variable 'Ql' set but not
used
libgcc/config/libbid/bid128_div.c:949:51: warning: variable 'Ql' set but not
used
libgcc/config/libbid/bid128_div.c:1406:51: warning: variable 'Ql' set but not
used

libsanitizer/ubsan/ubsan_diag.h:192:72: warning:
'Loc.__ubsan::Location::MemoryLoc' may be used uninitialized in this function
[-Wmaybe-uninitialized]

libssp/gets-chk.c:62:5: warning: 'gets' is deprecated
libssp/gets-chk.c:69:5: warning: 'gets' is deprecated
libssp/gets-chk.c:69: warning: the `gets' function is dangerous and should not
be used.

Built with:

mkdir ../gcc-build
cd    ../gcc-build
            \
../gcc-4.9.1/configure           \
     --prefix=/usr               \
     --enable-shared             \
     --enable-threads=posix      \
     --enable-__cxa_atexit       \
     --enable-clocale=gnu        \
     --enable-languages=c,c++    \
     --disable-multilib          \
     --disable-bootstrap         \
     --with-system-zlib

make