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NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; FUZZY_BLOCKED(0.00)[rspamd.com]; MISSING_XM_UA(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_TLS_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[gcc-patches@gcc.gnu.org]; DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Action: no action X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 837241FBB6 X-Spam-Score: -6.51 X-Spam-Level: X-Spam-Status: No, score=-11.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+incoming=patchwork.ozlabs.org@gcc.gnu.org The following avoids associating a reduction path as that might get STMT_VINFO_REDUC_IDX out-of-sync with the SLP operand order. This is a latent issue with SLP reductions but now easily exposed as we're doing single-lane SLP reductions. When we achieved SLP only we can move and update this meta-data. PR tree-optimization/115669 * tree-vect-slp.cc (vect_build_slp_tree_2): Do not reassociate chains that participate in a reduction. * gcc.dg/vect/pr115669.c: New testcase. --- gcc/testsuite/gcc.dg/vect/pr115669.c | 22 ++++++++++++++++++++++ gcc/tree-vect-slp.cc | 3 +++ 2 files changed, 25 insertions(+) create mode 100644 gcc/testsuite/gcc.dg/vect/pr115669.c diff --git a/gcc/testsuite/gcc.dg/vect/pr115669.c b/gcc/testsuite/gcc.dg/vect/pr115669.c new file mode 100644 index 00000000000..361a17a64e6 --- /dev/null +++ b/gcc/testsuite/gcc.dg/vect/pr115669.c @@ -0,0 +1,22 @@ +/* { dg-additional-options "-fwrapv" } */ + +#include "tree-vect.h" + +int a = 10; +unsigned b; +long long c[100]; +int foo() +{ + long long *d = c; + for (short e = 0; e < a; e++) + b += ~(d ? d[e] : 0); + return b; +} + +int main() +{ + check_vect (); + if (foo () != -10) + abort (); + return 0; +} diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc index ce214dd652e..cb8604eb611 100644 --- a/gcc/tree-vect-slp.cc +++ b/gcc/tree-vect-slp.cc @@ -2074,6 +2074,9 @@ vect_build_slp_tree_2 (vec_info *vinfo, slp_tree node, else if (is_a (vinfo) /* ??? We don't handle !vect_internal_def defs below. */ && STMT_VINFO_DEF_TYPE (stmt_info) == vect_internal_def + /* ??? Do not associate a reduction, this will wreck REDUC_IDX + mapping as long as that exists on the stmt_info level. */ + && STMT_VINFO_REDUC_IDX (stmt_info) == -1 && is_gimple_assign (stmt_info->stmt) && (associative_tree_code (gimple_assign_rhs_code (stmt_info->stmt)) || gimple_assign_rhs_code (stmt_info->stmt) == MINUS_EXPR) From patchwork Thu Jun 27 09:41:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Biener X-Patchwork-Id: 1953104 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=LStotBQc; dkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=fV+Ltc4a; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=LStotBQc; 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NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_TLS_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; MISSING_XM_UA(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[gcc-patches@gcc.gnu.org]; DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Action: no action X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 8430E1FBB6 X-Spam-Score: -6.51 X-Spam-Level: X-Spam-Status: No, score=-11.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+incoming=patchwork.ozlabs.org@gcc.gnu.org The following makes sure that for a SLP reductions all lanes have the same STMT_VINFO_REDUC_IDX. Once we move that info and can adjust it we can implement swapping. It also makes the existing protection against operand swapping trigger for all stmts participating in a reduction, not just the final one marked as reduction-def. * tree-vect-slp.cc (vect_build_slp_tree_1): Compare STMT_VINFO_REDUC_IDX. (vect_build_slp_tree_2): Prevent operand swapping for all stmts participating in a reduction. --- gcc/tree-vect-slp.cc | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc index cb8604eb611..db006661296 100644 --- a/gcc/tree-vect-slp.cc +++ b/gcc/tree-vect-slp.cc @@ -1072,6 +1072,7 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char *swap, stmt_vec_info first_load = NULL, prev_first_load = NULL; bool first_stmt_ldst_p = false, ldst_p = false; bool first_stmt_phi_p = false, phi_p = false; + int first_reduc_idx = -1; bool maybe_soft_fail = false; tree soft_fail_nunits_vectype = NULL_TREE; @@ -1204,6 +1205,7 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char *swap, first_stmt_code = rhs_code; first_stmt_ldst_p = ldst_p; first_stmt_phi_p = phi_p; + first_reduc_idx = STMT_VINFO_REDUC_IDX (stmt_info); /* Shift arguments should be equal in all the packed stmts for a vector shift with scalar shift operand. */ @@ -1267,6 +1269,19 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char *swap, } else { + if (first_reduc_idx != STMT_VINFO_REDUC_IDX (stmt_info)) + { + if (dump_enabled_p ()) + { + dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location, + "Build SLP failed: different reduc_idx " + "%d instead of %d in %G", + STMT_VINFO_REDUC_IDX (stmt_info), + first_reduc_idx, stmt); + } + /* Mismatch. */ + continue; + } if (first_stmt_code != rhs_code && alt_stmt_code == ERROR_MARK) alt_stmt_code = rhs_code; @@ -2535,8 +2550,7 @@ out: && oprnds_info[1]->first_dt == vect_internal_def && is_gimple_assign (stmt_info->stmt) /* Swapping operands for reductions breaks assumptions later on. */ - && STMT_VINFO_DEF_TYPE (stmt_info) != vect_reduction_def - && STMT_VINFO_DEF_TYPE (stmt_info) != vect_double_reduction_def) + && STMT_VINFO_REDUC_IDX (stmt_info) != -1) { /* See whether we can swap the matching or the non-matching stmt operands. */