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* [Bug tree-optimization/104322] New: Dead code in gcc/tree-vect-loop.cc @ 2022-02-01 10:03 marxin at gcc dot gnu.org 2022-02-01 10:31 ` [Bug tree-optimization/104322] " rguenth at gcc dot gnu.org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: marxin at gcc dot gnu.org @ 2022-02-01 10:03 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104322 Bug ID: 104322 Summary: Dead code in gcc/tree-vect-loop.cc Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: marxin at gcc dot gnu.org CC: rguenth at gcc dot gnu.org Target Milestone: --- I noticed the following dead code: gcc/tree-vect-loop.cc:6643 if (STMT_VINFO_DEF_TYPE (stmt_info) == vect_reduction_def) stmt_info = vect_stmt_to_vectorize (STMT_VINFO_REDUC_DEF (stmt_info)); else { gcc_assert (STMT_VINFO_DEF_TYPE (stmt_info) == vect_double_reduction_def); use_operand_p use_p; gimple *use_stmt; bool res = single_imm_use (gimple_phi_result (stmt_info->stmt), &use_p, &use_stmt); gcc_assert (res); phi_info = loop_vinfo->lookup_stmt (use_stmt); stmt_info = vect_stmt_to_vectorize (STMT_VINFO_REDUC_DEF (phi_info)); } /* PHIs should not participate in patterns. */ gcc_assert (!STMT_VINFO_RELATED_STMT (phi_info)); gphi *reduc_def_phi = as_a <gphi *> (phi_info->stmt); /* Verify following REDUC_IDX from the latch def leads us back to the PHI and compute the reduction chain length. Discover the real reduction operation stmt on the way (stmt_info and slp_for_stmt_info). */ tree reduc_def = PHI_ARG_DEF_FROM_EDGE (reduc_def_phi, loop_latch_edge (gimple_bb (reduc_def_phi)->loop_father)); unsigned reduc_chain_length = 0; bool only_slp_reduc_chain = true; stmt_info = NULL; As seen the 2 assignments to stmt_info are dead. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/104322] Dead code in gcc/tree-vect-loop.cc 2022-02-01 10:03 [Bug tree-optimization/104322] New: Dead code in gcc/tree-vect-loop.cc marxin at gcc dot gnu.org @ 2022-02-01 10:31 ` rguenth at gcc dot gnu.org 2022-04-29 8:16 ` cvs-commit at gcc dot gnu.org 2022-04-29 8:17 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2022-02-01 10:31 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104322 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org Last reconfirmed| |2022-02-01 Ever confirmed|0 |1 Status|UNCONFIRMED |ASSIGNED --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Probably a left-over from some of the refactorings - the solution is to simply remove the dead assignments and turn the if() into one for vect_double_reduction_def. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/104322] Dead code in gcc/tree-vect-loop.cc 2022-02-01 10:03 [Bug tree-optimization/104322] New: Dead code in gcc/tree-vect-loop.cc marxin at gcc dot gnu.org 2022-02-01 10:31 ` [Bug tree-optimization/104322] " rguenth at gcc dot gnu.org @ 2022-04-29 8:16 ` cvs-commit at gcc dot gnu.org 2022-04-29 8:17 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2022-04-29 8:16 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104322 --- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>: https://gcc.gnu.org/g:7259481f0ece6283a6e2943448e8d28ffffc40f9 commit r13-29-g7259481f0ece6283a6e2943448e8d28ffffc40f9 Author: Richard Biener <rguenther@suse.de> Date: Tue Feb 1 11:32:11 2022 +0100 tree-optimization/104322 - remove dead code in vectorizable_reduction The PR points out dead code after previous refactoring. 2022-02-01 Richard Biener <rguenther@suse.de> PR tree-optimization/104322 * tree-vect-loop.cc (vectorizable_reduction): Remove dead code. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/104322] Dead code in gcc/tree-vect-loop.cc 2022-02-01 10:03 [Bug tree-optimization/104322] New: Dead code in gcc/tree-vect-loop.cc marxin at gcc dot gnu.org 2022-02-01 10:31 ` [Bug tree-optimization/104322] " rguenth at gcc dot gnu.org 2022-04-29 8:16 ` cvs-commit at gcc dot gnu.org @ 2022-04-29 8:17 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2022-04-29 8:17 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104322 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED --- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- Fixed for GCC 13. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-04-29 8:17 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-02-01 10:03 [Bug tree-optimization/104322] New: Dead code in gcc/tree-vect-loop.cc marxin at gcc dot gnu.org 2022-02-01 10:31 ` [Bug tree-optimization/104322] " rguenth at gcc dot gnu.org 2022-04-29 8:16 ` cvs-commit at gcc dot gnu.org 2022-04-29 8:17 ` rguenth at gcc dot gnu.org
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