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From: "stefansf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/114802] New: FAIL: gcc.dg/tree-ssa/forwprop-40.c and
 forwprop-41.c on s390
Date: Mon, 22 Apr 2024 10:54:35 +0000
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X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114802

            Bug ID: 114802
           Summary: FAIL: gcc.dg/tree-ssa/forwprop-40.c and forwprop-41.c
                    on s390
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: stefansf at gcc dot gnu.org
  Target Milestone: ---
            Target: s390*-*-*

FAIL: gcc.dg/tree-ssa/forwprop-40.c scan-tree-dump-times optimized
"BIT_FIELD_REF" 0
FAIL: gcc.dg/tree-ssa/forwprop-40.c scan-tree-dump-times optimized
"BIT_INSERT_EXPR" 0
FAIL: gcc.dg/tree-ssa/forwprop-41.c scan-tree-dump-times optimized
"BIT_FIELD_REF" 0
FAIL: gcc.dg/tree-ssa/forwprop-41.c scan-tree-dump-times optimized
"BIT_INSERT_EXPR" 1

Originating from PR93080 the tests fail on s390 since can_vec_perm_const_p
fails which r14-3381-g27de9aa152141e aims for and therefore the bit insert/=
ref
survive. Thus, currently for forwprop-40.c we emit:

g:
        vlgvf   %r1,%v24,0=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20
        vlvgf   %v24,%r1,0
        br      %r14

and for forwprop-41.c:

g:
        vlgvf   %r1,%v24,2
        vlvgf   %v24,%r1,2
        vlvgf   %v24,%r2,1
        br      %r14=