[Bug tree-optimization/30093] New: vectorization of sqrt segfaults

["ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Following testcase segfaults for x86_64 and i686 sse2 targets with -ffast-math:

double x[256];

void foo(void)
{
  int i;
  for (i=0; i<256; ++i)
    x[i] = sqrt (x[i]);
}

gcc -O2 -ftree-vectorize -ffast-math vect-sqrt.c vect-sqrt.c:
In function ?foo?:
vect-sqrt.c:7: warning: incompatible implicit declaration of built-in function
?sqrt?
?
Segmentation fault

backtrace:
Analyzing compilation unit
Performing interprocedural optimizations
Assembling functions:
 foo
Program received signal SIGSEGV, Segmentation fault.
0x0000003cefd72270 in strlen () from /lib64/libc.so.6
(gdb) bt
#0  0x0000003cefd72270 in strlen () from /lib64/libc.so.6
#1  0x00000000007ff4dd in pp_base_string (pp=0xcf3d60, str=0x101040101010100
<Address 0x101040101010100 out of bounds>) at
../../gcc-svn/trunk/gcc/pretty-print.c:804
#2  0x000000000080010a in pp_base_format (pp=0xcf3d60, text=0x7fffff8a0fe0) at
../../gcc-svn/trunk/gcc/pretty-print.c:449
#3  0x00000000005976d8 in diagnostic_report_diagnostic (context=0xc3d420,
diagnostic=0x7fffff8a0fe0) at ../../gcc-svn/trunk/gcc/diagnostic.c:404
#4  0x00000000005978fe in internal_error (gmsgid=Variable "gmsgid" is not
available.
) at ../../gcc-svn/trunk/gcc/diagnostic.c:588
#5  0x00000000007d13c9 in tree_class_check_failed (node=Variable "node" is not
available.
) at ../../gcc-svn/trunk/gcc/tree.c:6409
#6  0x00000000008c103d in vectorizable_call (stmt=0x2aaaadab2c90,
bsi=0x7fffff8a1210, vec_stmt=0x7fffff8a1250) at
../../gcc-svn/trunk/gcc/tree-vect-transform.c:1717
#7  0x00000000008c7b4d in vect_transform_loop (loop_vinfo=0xd11ae0) at
../../gcc-svn/trunk/gcc/tree-vect-transform.c:3882
#8  0x00000000008b4a72 in vectorize_loops () at
../../gcc-svn/trunk/gcc/tree-vectorizer.c:2189


-- 
           Summary: vectorization of sqrt segfaults
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ubizjak at gmail dot com
 GCC build triplet: x86_64-pc-linux-gnu
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu, i686-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30093