https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70482
Bug ID: 70482
Summary: Opimization opportunity to vectorize basic block for
-mavx target.
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ysrumyan at gmail dot com
Target Milestone: ---
If we compile bb-slp-pattern-1.c from gcc.dg/vect suite with -mavx pattern
vectorization won't happen since AVX has very poor support for 256-bit integer
arithmetic. Particularly, widen-mult pattern is recognized but it is not
supported for 256-bit vectors.
Test is failed for native compiler build on AVX machine. The most simple
decision is to use the same scheme as for loop vectorization by decreasing
vector size from 256-bit to 128-bit.
