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* [Bug c/37870] New: ICE in extract_bit_field_1
@ 2008-10-19 11:48 bernard at brenda-arkle dot me dot uk
2008-10-19 12:42 ` [Bug middle-end/37870] [4.3/4.4 Regression] " rguenth at gcc dot gnu dot org
` (10 more replies)
0 siblings, 11 replies; 12+ messages in thread
From: bernard at brenda-arkle dot me dot uk @ 2008-10-19 11:48 UTC (permalink / raw)
To: gcc-bugs
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Reproducing this is easy.
cat > ICE.sample.c <<'EOF'
typedef unsigned int size_t;
extern void *memcpy (void *__restrict __dest,
__const void *__restrict __src, size_t __n)
__attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));
unsigned xxx(long double arg)
{
struct
{
char dummy[8];
unsigned yyy:7;
} copy;
memcpy(©, &arg, sizeof(copy));
return copy.yyy;
}
EOF
invoking 'gcc -c -O1 sample.c' then emits
/home/bernard/ICE.sample.c: In function xxx:
/home/bernard/ICE.sample.c:8: internal compiler error: in extract_bit_field_1,
at expmed.c:1271
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
This is quite sensitive! Small changes make the ICE
go away. These include
using -O0
re-sizing the array member dummy[] in the struct
Replacing the memcpy() with an assignment via a
cast pointer:
give the struct a tag (e.g., struct fimbulwinter)
copy = *((struct fimbulwinter *)&arg)
renaming memcpy() at both occurrences to by-pass the built-in
The last is suggestive, no?
This is NOT a duplicate of bug 37269, though the ICE is reported from
the same function. I get the same behaviour after applying Andrew
Pinski's patch for that bug. In fact, I found this bug in an echt
4.3.1 bootstrap build, applied AP's patch, still had it, then used
that compiler to bootstrap a 4.3.2 build, also with AP's patch.
Even using xgcc/cc1 from the stage 1 boostrap build of 4.3.2
showed the bug (there was nothing extra interesting in the
diagnostics produced).
'configure' was invoked with
'../gcc-4.3.2/configure' '--prefix=/usr' '--libexecdir=/usr/lib'
'--infodir=/usr/share/info' '--mandir=/usr/share/man' '--enable-libada'
'--enable-libssp' '--disable-werror' '--with-mpfr=/usr' '--with-gmp=/usr'
'--with-datarootdir=/usr/share' '--with-docdir=/usr/share/gcc-4.3.2/doc'
'--with-pdfdir=/usr/share/gcc-4.3.2/doc'
'--with-htmldir=/usr/share/gcc-4.3.2/doc/html' '--disable-coverage'
'--enable-nls' '--enable-__cxa_atexit' '--enable-decimal-float'
'--disable-fixed-point' '--enable-threads=posix' '--enable-clocale=gnu'
'--enable-shared' '--disable-intermodule'
'--enable-languages=ada,c++,fortran,java,objc,obj-c++,treelang,c'
'--with-local-prefix=/usr' '--with-gnu-ld' '--with-demangler-in-ld'
'--with-gnu-as' '--with-system-libunwind' '--with-system-zlib'
'--enable-bootstrap'
All those single quotes derive from my build scripts, which quote-and-
escape everything in sight. The actual CPU is an Athlon64 X2 5600+
(the 2.9GHz flavour, not the 2.8GHz flavour).
My binutils are from release 2.18, built with an unpatched gcc-4.3.1 .
--
Summary: ICE in extract_bit_field_1
Product: gcc
Version: 4.3.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: bernard at brenda-arkle dot me dot uk
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/37870] [4.3/4.4 Regression] ICE in extract_bit_field_1
2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
@ 2008-10-19 12:42 ` rguenth at gcc dot gnu dot org
2008-10-19 12:51 ` rguenth at gcc dot gnu dot org
` (9 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2008-10-19 12:42 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2008-10-19 12:40 -------
Confirmed.
We try to expand
return (unsigned int) VIEW_CONVERT_EXPR<struct
{
char dummy[8];
<unnamed-unsigned:7> yyy;
}>(arg).yyy;
which is SRAed from the gimplified memcpy
copy = VIEW_CONVERT_EXPR<struct
{
char dummy[8];
<unnamed-unsigned:7> yyy;
}>(arg);
to
<bb 2>:
copy$yyy_5 = 0;
copy$dummy$7_6 = VIEW_CONVERT_EXPR<struct
{
char dummy[8];
<unnamed-unsigned:7> yyy;
}>(arg_4(D)).dummy[7];
...
SR.9_14 = VIEW_CONVERT_EXPR<struct
{
char dummy[8];
<unnamed-unsigned:7> yyy;
}>(arg_4(D)).yyy;
copy$yyy_15 = SR.9_14;
SR.10_16 = copy$yyy_15;
D.1204_1 = SR.10_16;
D.1203_2 = (unsigned int) D.1204_1;
return D.1203_2;
It seems extract_bitfield_1 doesn't have a fallback path going through memory:
1261 /* Make sure we are playing with integral modes. Pun with subregs
1262 if we aren't. */
1263 {
1264 enum machine_mode imode = int_mode_for_mode (GET_MODE (op0));
1265 if (imode != GET_MODE (op0))
(gdb) l
1266 {
1267 if (MEM_P (op0))
1268 op0 = adjust_address (op0, imode, 0);
1269 else
1270 {
1271 gcc_assert (imode != BLKmode);
obviously fails on i?86 with
(gdb) call debug_rtx (op0)
(reg/v:XF 59 [ arg ])
simply not going down this path and relying on the fallback seems to work.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Component|c |middle-end
Ever Confirmed|0 |1
Keywords| |ice-on-valid-code
Known to fail| |4.3.2 4.4.0
Known to work| |4.2.4
Last reconfirmed|0000-00-00 00:00:00 |2008-10-19 12:40:45
date| |
Summary|ICE in extract_bit_field_1 |[4.3/4.4 Regression] ICE in
| |extract_bit_field_1
Target Milestone|--- |4.3.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/37870] [4.3/4.4 Regression] ICE in extract_bit_field_1
2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
2008-10-19 12:42 ` [Bug middle-end/37870] [4.3/4.4 Regression] " rguenth at gcc dot gnu dot org
@ 2008-10-19 12:51 ` rguenth at gcc dot gnu dot org
2008-10-19 13:58 ` bernard at brenda-arkle dot me dot uk
` (8 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2008-10-19 12:51 UTC (permalink / raw)
To: gcc-bugs
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |rguenth at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
Last reconfirmed|2008-10-19 12:40:45 |2008-10-19 12:50:28
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/37870] [4.3/4.4 Regression] ICE in extract_bit_field_1
2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
2008-10-19 12:42 ` [Bug middle-end/37870] [4.3/4.4 Regression] " rguenth at gcc dot gnu dot org
2008-10-19 12:51 ` rguenth at gcc dot gnu dot org
@ 2008-10-19 13:58 ` bernard at brenda-arkle dot me dot uk
2008-10-19 14:41 ` bernard at brenda-arkle dot me dot uk
` (7 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: bernard at brenda-arkle dot me dot uk @ 2008-10-19 13:58 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from bernard at brenda-arkle dot me dot uk 2008-10-19 13:57 -------
*** Bug 37872 has been marked as a duplicate of this bug. ***
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/37870] [4.3/4.4 Regression] ICE in extract_bit_field_1
2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
` (2 preceding siblings ...)
2008-10-19 13:58 ` bernard at brenda-arkle dot me dot uk
@ 2008-10-19 14:41 ` bernard at brenda-arkle dot me dot uk
2008-10-22 3:49 ` mmitchel at gcc dot gnu dot org
` (6 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: bernard at brenda-arkle dot me dot uk @ 2008-10-19 14:41 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from bernard at brenda-arkle dot me dot uk 2008-10-19 14:39 -------
*** Bug 37873 has been marked as a duplicate of this bug. ***
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/37870] [4.3/4.4 Regression] ICE in extract_bit_field_1
2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
` (3 preceding siblings ...)
2008-10-19 14:41 ` bernard at brenda-arkle dot me dot uk
@ 2008-10-22 3:49 ` mmitchel at gcc dot gnu dot org
2008-10-25 18:44 ` rguenth at gcc dot gnu dot org
` (5 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: mmitchel at gcc dot gnu dot org @ 2008-10-22 3:49 UTC (permalink / raw)
To: gcc-bugs
--
mmitchel at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/37870] [4.3/4.4 Regression] ICE in extract_bit_field_1
2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
` (4 preceding siblings ...)
2008-10-22 3:49 ` mmitchel at gcc dot gnu dot org
@ 2008-10-25 18:44 ` rguenth at gcc dot gnu dot org
2008-10-29 15:01 ` jakub at gcc dot gnu dot org
` (4 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2008-10-25 18:44 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from rguenth at gcc dot gnu dot org 2008-10-25 18:43 -------
Patch is wrong, we should go through memory somehow.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|rguenth at gcc dot gnu dot |unassigned at gcc dot gnu
|org |dot org
URL|http://gcc.gnu.org/ml/gcc- |
|patches/2008- |
|10/msg00785.html |
Status|ASSIGNED |NEW
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/37870] [4.3/4.4 Regression] ICE in extract_bit_field_1
2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
` (5 preceding siblings ...)
2008-10-25 18:44 ` rguenth at gcc dot gnu dot org
@ 2008-10-29 15:01 ` jakub at gcc dot gnu dot org
2008-10-29 16:08 ` jakub at gcc dot gnu dot org
` (3 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: jakub at gcc dot gnu dot org @ 2008-10-29 15:01 UTC (permalink / raw)
To: gcc-bugs
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |jakub at gcc dot gnu dot org
|dot org |
URL| |http://gcc.gnu.org/ml/gcc-
| |patches/2008-
| |10/msg01236.html
Status|NEW |ASSIGNED
Last reconfirmed|2008-10-19 12:50:28 |2008-10-29 15:01:05
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/37870] [4.3/4.4 Regression] ICE in extract_bit_field_1
2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
` (6 preceding siblings ...)
2008-10-29 15:01 ` jakub at gcc dot gnu dot org
@ 2008-10-29 16:08 ` jakub at gcc dot gnu dot org
2008-10-29 16:09 ` [Bug middle-end/37870] [4.3 " jakub at gcc dot gnu dot org
` (2 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: jakub at gcc dot gnu dot org @ 2008-10-29 16:08 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from jakub at gcc dot gnu dot org 2008-10-29 16:07 -------
Subject: Bug 37870
Author: jakub
Date: Wed Oct 29 16:07:39 2008
New Revision: 141430
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=141430
Log:
PR middle-end/37870
* expmed.c (extract_bit_field_1): If int_mode_for_mode returns
BLKmode for non-memory, convert using a wider MODE_INT mode
or through memory.
* gcc.target/i386/pr37870.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr37870.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/expmed.c
trunk/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/37870] [4.3 Regression] ICE in extract_bit_field_1
2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
` (7 preceding siblings ...)
2008-10-29 16:08 ` jakub at gcc dot gnu dot org
@ 2008-10-29 16:09 ` jakub at gcc dot gnu dot org
2008-11-05 20:36 ` jakub at gcc dot gnu dot org
2008-11-05 20:46 ` jakub at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: jakub at gcc dot gnu dot org @ 2008-10-29 16:09 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from jakub at gcc dot gnu dot org 2008-10-29 16:08 -------
Fixed on the trunk so far.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail|4.3.2 4.4.0 |4.3.2
Known to work|4.2.4 |4.2.4 4.4.0
Summary|[4.3/4.4 Regression] ICE in |[4.3 Regression] ICE in
|extract_bit_field_1 |extract_bit_field_1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/37870] [4.3 Regression] ICE in extract_bit_field_1
2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
` (8 preceding siblings ...)
2008-10-29 16:09 ` [Bug middle-end/37870] [4.3 " jakub at gcc dot gnu dot org
@ 2008-11-05 20:36 ` jakub at gcc dot gnu dot org
2008-11-05 20:46 ` jakub at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: jakub at gcc dot gnu dot org @ 2008-11-05 20:36 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from jakub at gcc dot gnu dot org 2008-11-05 20:35 -------
Subject: Bug 37870
Author: jakub
Date: Wed Nov 5 20:33:54 2008
New Revision: 141618
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=141618
Log:
PR middle-end/37870
* expmed.c (extract_bit_field_1): If int_mode_for_mode returns
BLKmode for non-memory, convert using a wider MODE_INT mode
or through memory.
* gcc.target/i386/pr37870.c: New test.
Added:
branches/gcc-4_3-branch/gcc/testsuite/gcc.target/i386/pr37870.c
Modified:
branches/gcc-4_3-branch/gcc/ChangeLog
branches/gcc-4_3-branch/gcc/expmed.c
branches/gcc-4_3-branch/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/37870] [4.3 Regression] ICE in extract_bit_field_1
2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
` (9 preceding siblings ...)
2008-11-05 20:36 ` jakub at gcc dot gnu dot org
@ 2008-11-05 20:46 ` jakub at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: jakub at gcc dot gnu dot org @ 2008-11-05 20:46 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from jakub at gcc dot gnu dot org 2008-11-05 20:45 -------
Fixed.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37870
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2008-11-05 20:46 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
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2008-10-19 11:48 [Bug c/37870] New: ICE in extract_bit_field_1 bernard at brenda-arkle dot me dot uk
2008-10-19 12:42 ` [Bug middle-end/37870] [4.3/4.4 Regression] " rguenth at gcc dot gnu dot org
2008-10-19 12:51 ` rguenth at gcc dot gnu dot org
2008-10-19 13:58 ` bernard at brenda-arkle dot me dot uk
2008-10-19 14:41 ` bernard at brenda-arkle dot me dot uk
2008-10-22 3:49 ` mmitchel at gcc dot gnu dot org
2008-10-25 18:44 ` rguenth at gcc dot gnu dot org
2008-10-29 15:01 ` jakub at gcc dot gnu dot org
2008-10-29 16:08 ` jakub at gcc dot gnu dot org
2008-10-29 16:09 ` [Bug middle-end/37870] [4.3 " jakub at gcc dot gnu dot org
2008-11-05 20:36 ` jakub at gcc dot gnu dot org
2008-11-05 20:46 ` jakub at gcc dot gnu dot org
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