https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82426
Bug ID: 82426
Summary: Missed tree-slp-vectorization on -O2 and -O3
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: linux at carewolf dot com
Target Milestone: ---
Created attachment 42299
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42299&action=edit
vectslp.cpp
The attached example is a simple matrix multiplication. With -O3 or -O2
-ftree-slp-vectorize the basic-block is not vectorized.
Oddly, with -Os -ftree-slp-vectorize it is.
