[Bug tree-optimization/60896] [4.10 Regression] ICE: in vect_get_vec_def_for_operand, at tree-vect-stmts.c:1449

["congh at google dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60896

--- Comment #3 from Cong Hou <congh at google dot com> ---
Created attachment 32668
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32668&action=edit
The patch to fix PR60896

The reason of this issue is that those statements in PATTERN_DEF_SEQ in
pre-recognized widen-mult pattern are not forwarded to later recognized
dot-product pattern. I have created a patch to fix this.

Another issue is that the def types of statements in PATTERN_DEF_SEQ are
assigned with the def type of the pattern statement. This is incorrect for
reduction pattern statement, in which case all statements in PATTERN_DEF_SEQ
will all be vect_reduction_def, and none of them will be vectorized later. The
def type of statement in PATTERN_DEF_SEQ should always be vect_internal_def.

This patch will also be submitted to gcc-patch.