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From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/58041] Unaligned access to arrays in packed structure Date: Thu, 01 Aug 2013 18:32:00 -0000 [thread overview] Message-ID: <bug-58041-4-GGotIeQa4N@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-58041-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58041 --- Comment #15 from Bill Schmidt <wschmidt at gcc dot gnu.org> --- Bernd, Mikael, Martin: Could you please test this on your respective targets? Index: gcc/gimple-ssa-strength-reduction.c =================================================================== --- gcc/gimple-ssa-strength-reduction.c (revision 201413) +++ gcc/gimple-ssa-strength-reduction.c (working copy) @@ -845,6 +845,8 @@ slsr_process_ref (gimple gs) int unsignedp, volatilep; double_int index; slsr_cand_t c; + unsigned HOST_WIDE_INT misalign; + unsigned align; if (gimple_vdef (gs)) ref_expr = gimple_assign_lhs (gs); @@ -857,6 +859,16 @@ slsr_process_ref (gimple gs) && DECL_BIT_FIELD (TREE_OPERAND (ref_expr, 1)))) return; + /* If this reference doesn't meet alignment restrictions, don't + make it a candidate. */ + get_object_alignment_1 (ref_expr, &align, &misalign); + + if (misalign != 0) + align = (misalign & -misalign); + + if (align < TYPE_ALIGN (TREE_TYPE (ref_expr))) + return; + base = get_inner_reference (ref_expr, &bitsize, &bitpos, &offset, &mode, &unsignedp, &volatilep, false); index = double_int::from_uhwi (bitpos); Thanks, Bill
next prev parent reply other threads:[~2013-08-01 18:32 UTC|newest] Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-08-01 7:26 [Bug middle-end/58041] New: " bernd.edlinger at hotmail dot de 2013-08-01 7:31 ` [Bug middle-end/58041] " bernd.edlinger at hotmail dot de 2013-08-01 9:09 ` mikpe at it dot uu.se 2013-08-01 11:36 ` mikpe at it dot uu.se 2013-08-01 11:51 ` mikpe at it dot uu.se 2013-08-01 13:26 ` wschmidt at gcc dot gnu.org 2013-08-01 16:18 ` wschmidt at gcc dot gnu.org 2013-08-01 16:23 ` jamborm at gcc dot gnu.org 2013-08-01 16:48 ` jamborm at gcc dot gnu.org 2013-08-01 17:27 ` jamborm at gcc dot gnu.org 2013-08-01 17:49 ` wschmidt at gcc dot gnu.org 2013-08-01 17:54 ` wschmidt at gcc dot gnu.org 2013-08-01 18:17 ` bernd.edlinger at hotmail dot de 2013-08-01 18:29 ` wschmidt at gcc dot gnu.org 2013-08-01 18:32 ` wschmidt at gcc dot gnu.org [this message] 2013-08-01 19:09 ` bernd.edlinger at hotmail dot de 2013-08-01 19:20 ` wschmidt at gcc dot gnu.org 2013-08-01 19:36 ` mikpe at it dot uu.se 2013-08-01 23:06 ` jamborm at gcc dot gnu.org 2013-08-02 15:22 ` wschmidt at gcc dot gnu.org 2013-08-02 15:28 ` wschmidt at gcc dot gnu.org 2013-08-02 15:54 ` ebotcazou at gcc dot gnu.org 2013-08-02 16:06 ` wschmidt at gcc dot gnu.org 2013-08-02 16:58 ` jamborm at gcc dot gnu.org 2013-08-02 17:12 ` wschmidt at gcc dot gnu.org 2013-08-02 18:07 ` wschmidt at gcc dot gnu.org 2013-08-03 8:31 ` bernd.edlinger at hotmail dot de 2013-08-05 17:43 ` jamborm at gcc dot gnu.org 2013-08-06 11:59 ` jamborm at gcc dot gnu.org 2013-08-06 14:24 ` bernd.edlinger at hotmail dot de 2013-08-06 15:18 ` jamborm at gcc dot gnu.org 2013-08-06 15:19 ` jamborm at gcc dot gnu.org 2013-08-06 15:33 ` bernd.edlinger at hotmail dot de 2013-08-06 15:56 ` bernd.edlinger at hotmail dot de 2013-08-06 16:06 ` jamborm at gcc dot gnu.org 2013-08-06 16:12 ` bernd.edlinger at hotmail dot de 2013-08-06 16:36 ` bernd.edlinger at hotmail dot de 2013-08-06 16:59 ` jamborm at gcc dot gnu.org 2013-08-06 17:07 ` bernd.edlinger at hotmail dot de 2013-08-06 17:37 ` jamborm at gcc dot gnu.org 2013-08-06 18:19 ` wschmidt at gcc dot gnu.org
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