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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/107095] New: gcc.dg/vect/vect-89.c gets miscompiled by DSE Date: Fri, 30 Sep 2022 10:42:14 +0000 [thread overview] Message-ID: <bug-107095-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107095 Bug ID: 107095 Summary: gcc.dg/vect/vect-89.c gets miscompiled by DSE Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: rguenth at gcc dot gnu.org Target Milestone: --- When fully masked the loop with 256bit vectors gets optimized by FRE4 to <bb 2> [local count: 63136016]: .MASK_STORE (&tmp, 256B, { 0, -1, -1, -1, -1, -1, -1, -1 }, { 5, 5, 5, 5, 5, 5, 5, 5 }); MEM <vector(8) int> [(int *)&tmp + 32B] = { 5, 5, 5, 5, 5, 5, 5, 5 }; .MASK_STORE (&MEM <struct tmp_struct> [(void *)&tmp + 64B], 256B, { -1, 0, 0, 0, 0, 0, 0, 0 }, { 5, 5, 5, 5, 5, 5, 5, 5 }); <bb 4> [local count: 1010605809]: # i_18 = PHI <i_8(9), 0(2)> # ivtmp_3 = PHI <ivtmp_5(9), 16(2)> _1 = tmp.y[i_18]; if (_1 != 5) goto <bb 5>; [0.00%] else goto <bb 6>; [100.00%] <bb 5> [count: 0]: abort (); <bb 6> [local count: 1010605809]: i_8 = i_18 + 1; ivtmp_5 = ivtmp_3 - 1; if (ivtmp_5 != 0) goto <bb 9>; [94.12%] else goto <bb 7>; [5.88%] <bb 9> [local count: 951182190]: goto <bb 4>; [100.00%] <bb 7> [local count: 63136016]: tmp ={v} {CLOBBER(eol)}; return 0; but then DSE comes along and removes the first .MASK_STORE: Deleted dead call: .MASK_STORE (&tmp, 256B, { 0, -1, -1, -1, -1, -1, -1, -1 }, { 5, 5, 5, 5, 5, 5, 5, 5 });
next reply other threads:[~2022-09-30 10:42 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-09-30 10:42 rguenth at gcc dot gnu.org [this message] 2022-09-30 10:46 ` [Bug tree-optimization/107095] " rguenth at gcc dot gnu.org 2022-09-30 11:43 ` cvs-commit at gcc dot gnu.org 2022-09-30 11:43 ` rguenth at gcc dot gnu.org
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