http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52996
Bug #: 52996
Summary: ice in verify_loop_structure, at cfgloop.c:1567
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
[regehr@dyson r33]$ current-gcc -O3 -c small.c
small.c: In function 'fn1':
small.c:29:1: error: edge from 18 to 19 should be marked irreducible
}
^
small.c:29:1: error: basic block 19 should be marked irreducible
}
^
small.c:29:1: error: edge from 19 to 11 should be marked irreducible
}
^
small.c:29:1: internal compiler error: in verify_loop_structure, at
cfgloop.c:1567
}
^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
[regehr@dyson r33]$ cat small.c
int a, b, c, d, e, f;
void
fn1 ()
{
int g, h;
lbl_173:
if (a)
c++;
lbl_158:
e = 0;
h = 0;
for (; h > -8; h--)
{
g = 0;
for (; g <= 0; g += 1)
{
d = 1;
for (; d >= 0; d -= 1)
a = 1;
if (b)
break;
if (f)
return;
if (h)
goto lbl_158;
}
}
goto lbl_173;
}
[regehr@dyson r33]$ current-gcc -v
Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r186455-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.8.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto
--prefix=/home/regehr/z/compiler-install/gcc-r186455-install
--program-prefix=r186455- --enable-languages=c,c++
Thread model: posix
gcc version 4.8.0 20120414 (experimental) (GCC)
