From f4455d5f1268c418a48f09940c203611f08ab879 Mon Sep 17 00:00:00 2001 From: law Date: Tue, 28 Aug 2018 04:02:11 +0000 Subject: [PATCH] PR tree-optimization/87110 * tree-ssa-dse.c (compute_trims): Handle non-constant TYPE_SIZE_UNIT. PR tree-optimization/87110 * gcc.c-torture/compile/pr87110.c: New test. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@263906 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/ChangeLog | 6 ++++++ gcc/testsuite/ChangeLog | 5 +++++ gcc/testsuite/gcc.c-torture/compile/pr87110.c | 13 +++++++++++++ gcc/tree-ssa-dse.c | 6 +++++- 4 files changed, 29 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/gcc.c-torture/compile/pr87110.c diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4cbea7a195dd..a85530438877 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2018-08-27 Jeff Law + + PR tree-optimization/87110 + * tree-ssa-dse.c (compute_trims): Handle non-constant + TYPE_SIZE_UNIT. + 2018-08-27 Martin Sebor PR tree-optimization/86914 diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 4b5c1533c334..6d85561ef839 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2018-08-27 Jeff Law + + PR tree-optimization/87110 + * gcc.c-torture/compile/pr87110.c: New test. + 2018-08-27 Martin Sebor PR tree-optimization/86914 diff --git a/gcc/testsuite/gcc.c-torture/compile/pr87110.c b/gcc/testsuite/gcc.c-torture/compile/pr87110.c new file mode 100644 index 000000000000..8428d3d120a3 --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/compile/pr87110.c @@ -0,0 +1,13 @@ +enum a { b, c }; +struct d { + _Bool e; + enum a f +}; +g, h; +i() { + struct d j[h]; + j[0] = (struct d){.f = c}; + for (; g;) + (struct d){}; +} + diff --git a/gcc/tree-ssa-dse.c b/gcc/tree-ssa-dse.c index bddbbe8377a8..8b7aea0e54ee 100644 --- a/gcc/tree-ssa-dse.c +++ b/gcc/tree-ssa-dse.c @@ -250,9 +250,13 @@ compute_trims (ao_ref *ref, sbitmap live, int *trim_head, int *trim_tail, *trim_tail = last_orig - last_live; /* But don't trim away out of bounds accesses, as this defeats - proper warnings. */ + proper warnings. + + We could have a type with no TYPE_SIZE_UNIT or we could have a VLA + where TYPE_SIZE_UNIT is not a constant. */ if (*trim_tail && TYPE_SIZE_UNIT (TREE_TYPE (ref->base)) + && TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (ref->base))) == INTEGER_CST && compare_tree_int (TYPE_SIZE_UNIT (TREE_TYPE (ref->base)), last_orig) <= 0) *trim_tail = 0; -- 2.47.2