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From: Richard Biener <rguenth@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-1929] tree-optimization/106497 - more forward threader can-copy-bb Date: Tue, 2 Aug 2022 11:29:49 +0000 (GMT) [thread overview] Message-ID: <20220802112949.AA54D3853828@sourceware.org> (raw) https://gcc.gnu.org/g:0f3514756e0b4d8993ee43dcd958974eb1424061 commit r13-1929-g0f3514756e0b4d8993ee43dcd958974eb1424061 Author: Richard Biener <rguenther@suse.de> Date: Tue Aug 2 12:19:25 2022 +0200 tree-optimization/106497 - more forward threader can-copy-bb This adds EDGE_COPY_SRC_JOINER_BLOCK sources to the set of blocks we need to check we can duplicate. PR tree-optimization/106497 * tree-ssa-threadupdate.cc (fwd_jt_path_registry::update_cfg): Also verify we can copy EDGE_COPY_SRC_JOINER_BLOCK. * gcc.dg/torture/pr106497.c: New testcase. Diff: --- gcc/testsuite/gcc.dg/torture/pr106497.c | 20 ++++++++++++++++++++ gcc/tree-ssa-threadupdate.cc | 3 ++- 2 files changed, 22 insertions(+), 1 deletion(-) diff --git a/gcc/testsuite/gcc.dg/torture/pr106497.c b/gcc/testsuite/gcc.dg/torture/pr106497.c new file mode 100644 index 00000000000..601200de9e3 --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/pr106497.c @@ -0,0 +1,20 @@ +/* { dg-do compile } */ +/* { dg-additional-options "-fno-tree-dce" } */ + +int n; + +__attribute__ ((pure,returns_twice)) int +bar (void); + +int +foo (int x) +{ + n = 0; + + bar (); + + if (x && n) + return 0; + + foo (x); +} diff --git a/gcc/tree-ssa-threadupdate.cc b/gcc/tree-ssa-threadupdate.cc index 0f2b319d44a..59c268a3567 100644 --- a/gcc/tree-ssa-threadupdate.cc +++ b/gcc/tree-ssa-threadupdate.cc @@ -2679,7 +2679,8 @@ fwd_jt_path_registry::update_cfg (bool may_peel_loop_headers) { edge e = (*path)[j]->e; if (m_removed_edges->find_slot (e, NO_INSERT) - || ((*path)[j]->type == EDGE_COPY_SRC_BLOCK + || (((*path)[j]->type == EDGE_COPY_SRC_BLOCK + || (*path)[j]->type == EDGE_COPY_SRC_JOINER_BLOCK) && !can_duplicate_block_p (e->src))) break; }
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