gnu /
gcc /
199cd0e0f8744ca1e61a95987b2d020a592a46d9 tree-optimization/100089 - BB vectorization of if-converted loop bodies
The PR complains that when we only partially BB vectorize an
if-converted loop body that this can leave unvectorized code
unconditionally executed and thus effectively slow down code.
For -O2 we already mitigated the issue by not doing BB vectorization
when not all if-converted stmts were covered but the issue is
present with -O3 as well. Thus the following simply extends the
fix to cover all but the unlimited cost models. It is after all
very likely that we vectorize some stmts, if only a single
paired store.
2022-01-21 Richard Biener <rguenther@suse.de>
PR tree-optimization/100089
* tree-vect-slp.cc (vect_slp_region): Reject BB vectorization
of if-converted loops with unvectorized COND_EXPRs for
all but the unlimited cost models.
1 file changed
