------- Comment #4 from ubizjak at gmail dot com 2007-09-30 10:03 -------
segfaults with -ftree-vectorize in SLP.
reduced testcase:
--cut here--
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
void
rgb15to24_C (const uint8_t * src, uint8_t * dst, long src_size)
{
const uint16_t *end;
const uint16_t *s = (uint16_t *)src;
uint8_t *d = (uint8_t *)dst;
end = s + src_size/2;
while (s < end)
{
uint16_t bgr = *s++;
*d++ = (bgr&0x1F)<<3;
*d++ = (bgr&0x3E0)>>2;
*d++ = (bgr&0x7C00)>>7;
}
}
--cut here--
gcc -O2 -ftree-vectorize -msse2:
t.c: In function �rgb15to24_C�:
t.c:6: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
Program received signal SIGSEGV, Segmentation fault.
0x0000000000a94d24 in vect_build_slp_tree (loop_vinfo=0x1039cc0,
node=0x7fffb8b97da0, group_size=3, slp_impossible=0x7fffb8b97e3f "",
inside_cost=0x7fffb8b97e38, outside_cost=0x7fffb8b97e34,
ncopies_for_cost=3) at ../../gcc-svn/trunk/gcc/tree-vect-analyze.c:2700
2700 if (!VECTOR_MODE_P (optab_op2_mode))
#0 0x0000000000a94d24 in vect_build_slp_tree (loop_vinfo=0x1039cc0,
node=0x7fffb8b97da0, group_size=3, slp_impossible=0x7fffb8b97e3f "",
inside_cost=0x7fffb8b97e38, outside_cost=0x7fffb8b97e34,
ncopies_for_cost=3) at ../../gcc-svn/trunk/gcc/tree-vect-analyze.c:2700
#1 0x0000000000a94f73 in vect_build_slp_tree (loop_vinfo=0x1039cc0,
node=0x7fffb8b97e28, group_size=3, slp_impossible=0x7fffb8b97e3f "",
inside_cost=0x7fffb8b97e38, outside_cost=0x7fffb8b97e34,
ncopies_for_cost=3) at ../../gcc-svn/trunk/gcc/tree-vect-analyze.c:2870
#2 0x0000000000a955e3 in vect_analyze_slp_instance (loop_vinfo=0x1039cc0,
stmt=<value optimized out>)
at ../../gcc-svn/trunk/gcc/tree-vect-analyze.c:3000
#3 0x0000000000a993e0 in vect_analyze_loop (loop=<value optimized out>)
at ../../gcc-svn/trunk/gcc/tree-vect-analyze.c:3045
#4 0x00000000007f82ce in vectorize_loops ()
at ../../gcc-svn/trunk/gcc/tree-vectorizer.c:2501
Confirmed on x86_64 and i686/sse2.
--
ubizjak at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-09-30 10:03:40
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33597
