[Bug middle-end/28411] gfortran: Internal error: Illegal instruction

2006-07-18 Thread uros at kss-loka dot si 


--- Comment #4 from uros at kss-loka dot si  2006-07-18 07:29 ---
This is the backtrace for the testcase in comment #3:

#1  0x0827ae67 in fold_binary_to_constant (code=TRUNC_MOD_EXPR,
type=0x402473f4, op0=0x402d9438, op1=0x0) at
../../gcc-svn/trunk/gcc/fold-const.c:12314
#2  0x08174b25 in constant_multiple_of (type=0x402473f4, top=0x402d9438,
bot=0x0) at ../../gcc-svn/trunk/gcc/tree-ssa-loop-ivopts.c:2623
#3  0x081799d1 in get_computation_cost (data=0xb704, use=0x8706e70,
cand=0x8707358, address_p=0 '\0', depends_on=0xb5f4) at
../../gcc-svn/trunk/gcc/tree-ssa-loop-ivopts.c:3758
#4  0x0817a364 in determine_use_iv_cost (data=0xb704, use=0x8706e70,
cand=0x8707358) at ../../gcc-svn/trunk/gcc/tree-ssa-loop-ivopts.c:3901
#5  0x0817d41e in determine_use_iv_costs (data=0xb704) at
../../gcc-svn/trunk/gcc/tree-ssa-loop-ivopts.c:4128
#6  0x0817f3ac in tree_ssa_iv_optimize_loop (data=0xb704, loop=Variable
loop is not available.

constant_multiple_of() is calling fold_binary_to_constant() here:

  if (!zero_p (fold_binary_to_constant (TRUNC_MOD_EXPR, type, top, bot)))
return NULL_TREE;

As can be seen from backtrace above, bot operand is NULL, and this triggers
assert in fold_binary().


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28411

[Bug middle-end/28411] gfortran: Internal error: Illegal instruction

2006-07-17 Thread langton at gcc dot gnu dot org 


--- Comment #3 from langton at gcc dot gnu dot org  2006-07-17 22:26 ---
This doesn't appear to be a gfortran bug.  On both i686-darwin and
i686-pc-linux, a comparable C program crashes in the same way:

york.llnl.gov(831)% cat foo.c 
void test_check_sums()
{
  const int SIZE = 10;
  int array_i4[SIZE];
  long long array_i8[SIZE];
  double array_r8[SIZE];
  float array_r4[SIZE];
  int n;

for (n = 0; n SIZE; n++)
  {
array_i4[n] = (int) -3*n;
array_i8[n] = (long long) -3*n;
array_r4[n] = (float) -3*n;
array_r8[n] = (double) -3*n;
  }

}
york.llnl.gov(832)% gcc -ftrapv -c -O2 foo.c
foo.c: In function 'test_check_sums':
foo.c:2: internal compiler error: in fold_binary, at fold-const.c:8239
Please submit a full bug report,
with preprocessed source if appropriate.
See URL:http://gcc.gnu.org/bugs.html for instructions.
york.llnl.gov(833)% gcc -v
Using built-in specs.
Target: i386-apple-darwin8.7.1
Configured with: ../../source/mainline_source/configure
--prefix=/home/langton2/opt_mactel/ --with-gmp=/home/langton2/opt_mactel/
--with-mpfr=/home/langton2/opt_mactel/ --enable-languages=c,fortran
Thread model: posix
gcc version 4.2.0 20060703 (experimental)


-- 

langton at gcc dot gnu dot org changed:

   What|Removed |Added

  Component|fortran |middle-end


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28411