[Bug target/116571] New: GCN vs. "lower SLP load permutation to interleaving"

[tschwinge at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116571

            Bug ID: 116571
           Summary: GCN vs. "lower SLP load permutation to interleaving"
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: testsuite-fail
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
                CC: ams at gcc dot gnu.org, rguenth at gcc dot gnu.org
  Target Milestone: ---

With recent commit r15-3362-g464067a242150628ceb0d47daf2297f29a31743c "lower
SLP load permutation to interleaving", we've got two regressions for
'--target=amdgcn-amdhsa' (tested '-march=gfx908', '-march=gfx1100'):

    PASS: gcc.dg/vect/slp-11a.c (test for excess errors)
    PASS: gcc.dg/vect/slp-11a.c execution test
    PASS: gcc.dg/vect/slp-11a.c scan-tree-dump-times vect "vectorized 1 loops"
1
    [-PASS:-]{+FAIL:+} gcc.dg/vect/slp-11a.c scan-tree-dump-times vect
"vectorizing stmts using SLP" [-0-]{+1+}

    PASS: gcc.dg/vect/slp-12a.c (test for excess errors)
    PASS: gcc.dg/vect/slp-12a.c execution test
    PASS: gcc.dg/vect/slp-12a.c scan-tree-dump-times vect "vectorized 1 loops"
1
    [-PASS:-]{+FAIL:+} gcc.dg/vect/slp-12a.c scan-tree-dump-times vect
"vectorizing stmts using SLP" [-0-]{+1+}