[Bug c/25613] New: sh compiler hangs when compiling some inline asm

[Bug c/25613] New: sh compiler hangs when compiling some inline asm

[vapier at gentoo dot org]

attempting to build a package which tests a bunch of inline assembly snippets
to see if the host supports it ... in this case, this snippet caused a hang:

lantank # cat conftest.c
int main() {
    unsigned long foo;
    asm("pklb %1, %0" : "=r" (foo) : "rI" (foo));
    return 0;                   
}
lantank # gcc -v -c conftest.c
Reading specs from /usr/lib/gcc/sh4-gentoo-linux-uclibc/3.4.5/specs
Configured with: /var/tmp/portage/gcc-3.4.5/work/gcc-3.4.5/configure
--prefix=/usr --bindir=/usr/sh4-gentoo-linux-uclibc/gcc-bin/3.4.5
--includedir=/usr/lib/gcc/sh4-gentoo-linux-uclibc/3.4.5/include
--datadir=/usr/share/gcc-data/sh4-gentoo-linux-uclibc/3.4.5
--mandir=/usr/share/gcc-data/sh4-gentoo-linux-uclibc/3.4.5/man
--infodir=/usr/share/gcc-data/sh4-gentoo-linux-uclibc/3.4.5/info
--with-gxx-include-dir=/usr/lib/gcc/sh4-gentoo-linux-uclibc/3.4.5/include/g++-v3
--host=sh4-gentoo-linux-uclibc --build=sh4-gentoo-linux-uclibc
--disable-altivec --disable-nls --with-system-zlib --disable-checking
--disable-werror --disable-libunwind-exceptions --disable-multilib
--disable-libmudflap --disable-libgcj --enable-languages=c,c++ --enable-shared
--enable-threads=posix --disable-__cxa_atexit --enable-target-optspace
--enable-clocale=uclibc
Thread model: posix
gcc version 3.4.5 (Gentoo 3.4.5, ssp-3.4.5-1.0, pie-8.7.9)
 /usr/libexec/gcc/sh4-gentoo-linux-uclibc/3.4.5/cc1 -quiet -v conftest.c -quiet
-dumpbase conftest.c -auxbase conftest -version -o /tmp/cctiJvYX.s
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib/gcc/sh4-gentoo-linux-uclibc/3.4.5/../../../../sh4-gentoo-linux-uclibc/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/sh4-gentoo-linux-uclibc/3.4.5/include
 /usr/include
End of search list.
GNU C version 3.4.5 (Gentoo 3.4.5, ssp-3.4.5-1.0, pie-8.7.9)
(sh4-gentoo-linux-uclibc)
        compiled by GNU C version 3.4.5 (Gentoo 3.4.5, ssp-3.4.5-1.0,
pie-8.7.9).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
<hangs here>

attaching with strace shows that it's just spinning in an infinite loop
somewhere

tested Gentoo/gcc-3.4.5 native/cross sh4, FC4/gcc-4.0.0 cross


-- 
           Summary: sh compiler hangs when compiling some inline asm
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: vapier at gentoo dot org
GCC target triplet: sh4-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25613

[Bug c/25613] sh compiler hangs when compiling some inline asm

[kkojima at gcc dot gnu dot org]

------- Comment #1 from kkojima at gcc dot gnu dot org  2005-12-31 14:46 -------
FYI, current trunk and 4.1.0 (20051127 prerelease) exit with
"error: impossible constraint in 'asm'" messages for the given
test case.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25613

[Bug inline-asm/25613] [4.0 Regression] sh compiler hangs when compiling some inline asm

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.0.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25613

[Bug inline-asm/25613] [4.0 Regression] sh compiler hangs when compiling some inline asm

[kkojima at gcc dot gnu dot org]

------- Comment #2 from kkojima at gcc dot gnu dot org  2006-01-02 05:13 -------
It looks an SH target specific problem.
CONSTRAINT_LEN in config/sh/sh.h of 3.4/4.0 checks the wrong
constraints and returns -1 for them.  This causes an infinite
loop in parse_input_constraint whick has a loop like:

  for (j = 0; j < c_len; j += CONSTRAINT_LEN (constraint[j], constraint+j))
    ...

for the testcase in #1.  It seems that the above check
is to confirm the validity of the constraints which were
introduced when some SH single character constraints were
renamed to multiple character ones and that check was removed
on 4.1/trunk but it's simply forgotten to remove on the older
branches.
I'll propose a patch after the usual tests on branches.
It will take several days.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25613

[Bug target/25613] [4.0 Regression] sh compiler hangs when compiling some inline asm

[kkojima at gcc dot gnu dot org]

------- Comment #3 from kkojima at gcc dot gnu dot org  2006-01-04 23:07 -------
Subject: Bug 25613

Author: kkojima
Date: Wed Jan  4 23:07:24 2006
New Revision: 109355

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=109355
Log:
        PR target/25613
        * config/sh/sh.h (CONSTRAINT_LEN): Use unchecking version.      


Modified:
    branches/gcc-4_0-branch/gcc/ChangeLog
    branches/gcc-4_0-branch/gcc/config/sh/sh.h


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25613

[Bug target/25613] [4.0 Regression] sh compiler hangs when compiling some inline asm

[vapier at gentoo dot org]

------- Comment #4 from vapier at gentoo dot org  2006-01-05 05:02 -------
awesome, that fixed it in my 3.4.5 cross-compiler, now it exits with:
conftest.c: In function `main':
conftest.c:3: error: impossible constraint in `asm'

will this fix be applied only to the 4.0 branch ?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25613

[Bug target/25613] [4.0 Regression] sh compiler hangs when compiling some inline asm

[kkojima at gcc dot gnu dot org]

------- Comment #5 from kkojima at gcc dot gnu dot org  2006-01-05 06:04 -------
I proposed the patch in #3 at

  http://gcc.gnu.org/ml/gcc-patches/2006-01/msg00174.html

and an SH maintainer has approved it.  It's enough to check it in on 4.0,
though I believe that the patch for 3.4 branch needs an explicit approval
from the release manager of 3.4 branch.  I'm waiting it.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25613

[Bug target/25613] [4.0 Regression] sh compiler hangs when compiling some inline asm

[kkojima at gcc dot gnu dot org]

------- Comment #6 from kkojima at gcc dot gnu dot org  2006-01-12 01:20 -------
Subject: Bug 25613

Author: kkojima
Date: Thu Jan 12 01:20:32 2006
New Revision: 109625

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=109625
Log:
        PR target/25613
        * config/sh/sh.h (CONSTRAINT_LEN): Use unchecking version.      


Modified:
    branches/gcc-3_4-branch/gcc/ChangeLog
    branches/gcc-3_4-branch/gcc/config/sh/sh.h


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25613

[Bug target/25613] [4.0 Regression] sh compiler hangs when compiling some inline asm

[mmitchel at gcc dot gnu dot org]

------- Comment #7 from mmitchel at gcc dot gnu dot org  2006-01-15 22:59 -------
SH is not a primary platform; P5.


-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25613

[Bug target/25613] [4.0 Regression] sh compiler hangs when compiling some inline asm

[kkojima at gcc dot gnu dot org]

------- Comment #8 from kkojima at gcc dot gnu dot org  2006-01-16 04:26 -------
Patches were committed already.
Sorry for forgetting to change this as FIXED.


-- 

kkojima at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25613