http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50435
--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-09-16
15:53:07 UTC ---
> I understand that the loop vectorization somehow worked, so could you please
> try the following patch to avoid it:
Sorry, but after the patch I still have
Running /opt/gcc/work/gcc/testsuite/gcc.dg/vect/vect.exp ...
FAIL: gcc.dg/vect/bb-slp-25.c scan-tree-dump-times slp "basic block vectorized
using SLP" 1
FAIL: gcc.dg/vect/bb-slp-25.c -flto scan-tree-dump-times slp "basic block
vectorized using SLP" 1
=== gcc Summary for unix/-m32 ===
# of expected passes 4
# of unexpected failures 2
Running target unix/-m64
...
Running /opt/gcc/work/gcc/testsuite/gcc.dg/vect/vect.exp ...
FAIL: gcc.dg/vect/bb-slp-25.c scan-tree-dump-times slp "basic block vectorized
using SLP" 1
FAIL: gcc.dg/vect/bb-slp-25.c -flto scan-tree-dump-times slp "basic block
vectorized using SLP" 1
=== gcc Summary for unix/-m64 ===
# of expected passes 4
# of unexpected failures 2
=== gcc Summary ===
# of expected passes 8
# of unexpected failures 4
/opt/gcc/build_w/gcc/xgcc version 4.7.0 20110916 (experimental) [trunk
revision 178905] (GCC)
The loop is not vectorized:
/opt/gcc/work/gcc/testsuite/gcc.dg/vect/bb-slp-25.c:12: note: vectorized 0
loops in function.
and looking for SLP yields
189: Failed to SLP the basic block.
189: not vectorized: failed to find SLP opportunities in basic block.
43: Failed to SLP the basic block.
43: not vectorized: failed to find SLP opportunities in basic block.
50: Failed to SLP the basic block.
50: not vectorized: failed to find SLP opportunities in basic block.
