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From: "iii at linux dot ibm.com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/98113] New: [11 Regression] popcnt is not vectorized on s390 since f5e18dd9c7da Date: Thu, 03 Dec 2020 01:28:53 +0000 [thread overview] Message-ID: <bug-98113-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98113 Bug ID: 98113 Summary: [11 Regression] popcnt is not vectorized on s390 since f5e18dd9c7da Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: iii at linux dot ibm.com Target Milestone: --- s390's vxe/popcount-1.c began to fail after PR96789 fix. The reason is that for the following source code uv4si __attribute__((noinline)) vpopctf (uv4si a) { uv4si r; int i; for (i = 0; i < 4; i++) r[i] = __builtin_popcount (a[i]); return r; } FRE turned _4 = BIT_FIELD_REF <aD.2283, 32, 0>; _11 = __builtin_popcountD.1211 (_4); _18 = (unsigned intD.9) _11; BIT_FIELD_REF <rD.2286, 32, 0> = _18; i_20 = 1; ivtmp_21 = 3; _25 = VIEW_CONVERT_EXPR<unsigned intD.9[4]>(aD.2283)[i_20]; _26 = __builtin_popcountD.1211 (_25); _27 = (unsigned intD.9) _26; VIEW_CONVERT_EXPR<unsigned intD.9[4]>(rD.2286)[i_20] = _27; i_29 = i_20 + 1; ivtmp_30 = ivtmp_21 + 4294967295; _34 = VIEW_CONVERT_EXPR<unsigned intD.9[4]>(aD.2283)[i_29]; _35 = __builtin_popcountD.1211 (_34); _36 = (unsigned intD.9) _35; VIEW_CONVERT_EXPR<unsigned intD.9[4]>(rD.2286)[i_29] = _36; i_38 = i_29 + 1; ivtmp_39 = ivtmp_30 + 4294967295; _1 = VIEW_CONVERT_EXPR<unsigned intD.9[4]>(aD.2283)[i_38]; _2 = __builtin_popcountD.1211 (_1); _3 = (unsigned intD.9) _2; VIEW_CONVERT_EXPR<unsigned intD.9[4]>(rD.2286)[i_38] = _3; i_10 = i_38 + 1; ivtmp_16 = ivtmp_39 + 4294967295; _7 = rD.2286; rD.2286 ={v} {CLOBBER}; return _7; into _4 = BIT_FIELD_REF <a_17(D), 32, 0>; _11 = __builtin_popcountD.1211 (_4); _18 = (unsigned intD.9) _11; r_14 = BIT_INSERT_EXPR <r_15(D), _18, 0 (32 bits)>; _25 = BIT_FIELD_REF <a_17(D), 32, 32>; _26 = __builtin_popcountD.1211 (_25); _27 = (unsigned intD.9) _26; r_33 = BIT_INSERT_EXPR <r_14, _27, 32 (32 bits)>; _34 = BIT_FIELD_REF <a_17(D), 32, 64>; _35 = __builtin_popcountD.1211 (_34); _36 = (unsigned intD.9) _35; r_32 = BIT_INSERT_EXPR <r_33, _36, 64 (32 bits)>; _1 = BIT_FIELD_REF <a_17(D), 32, 96>; _2 = __builtin_popcountD.1211 (_1); _3 = (unsigned intD.9) _2; r_31 = BIT_INSERT_EXPR <r_32, _3, 96 (32 bits)>; _7 = r_31; return _7; that is, replaced a sequence of stores with a sequence of BIT_INSERT_EXPRs. slp1 now says: "missed: not vectorized: no grouped stores in basic block", presumably because it doesn't understand BIT_INSERT_EXPRs.
next reply other threads:[~2020-12-03 1:28 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-12-03 1:28 iii at linux dot ibm.com [this message] 2020-12-03 2:44 ` [Bug tree-optimization/98113] " linkw at gcc dot gnu.org 2020-12-03 3:20 ` linkw at gcc dot gnu.org 2020-12-03 7:52 ` rguenth at gcc dot gnu.org 2020-12-03 9:28 ` rguenth at gcc dot gnu.org 2020-12-03 10:59 ` rguenth at gcc dot gnu.org 2020-12-03 13:53 ` iii at linux dot ibm.com 2020-12-07 11:54 ` cvs-commit at gcc dot gnu.org 2020-12-07 11:54 ` rguenth at gcc dot gnu.org
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