diff --git a/gcc/testsuite/gcc.dg/vect/pr107302.c b/gcc/testsuite/gcc.dg/vect/pr107302.c new file mode 100644 index 00000000000..293f7e4067a --- /dev/null +++ b/gcc/testsuite/gcc.dg/vect/pr107302.c @@ -0,0 +1,13 @@ +/* { dg-do compile } */ +/* { dg-additional-options "-fno-tree-pre" } */ + +int a[2000]; +int s292_im1; + +void +s292() { + for (int i = 0; i < 2000; i++) { + a[i] = s292_im1; + s292_im1 = i; + } +} diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc index 63e86540d12..92790bd8095 100644 --- a/gcc/tree-vect-loop.cc +++ b/gcc/tree-vect-loop.cc @@ -8485,9 +8485,15 @@ vectorizable_recurr (loop_vec_info loop_vinfo, stmt_vec_info stmt_info, second and later operands are tentative and will be updated when we have vectorized the latch definition. */ edge le = loop_latch_edge (LOOP_VINFO_LOOP (loop_vinfo)); - gimple_stmt_iterator gsi2 - = gsi_for_stmt (SSA_NAME_DEF_STMT (PHI_ARG_DEF_FROM_EDGE (phi, le))); - gsi_next (&gsi2); + gimple *latch_def = SSA_NAME_DEF_STMT (PHI_ARG_DEF_FROM_EDGE (phi, le)); + gimple_stmt_iterator gsi2; + if (is_a (latch_def)) + gsi2 = gsi_after_labels (gimple_bb (latch_def)); + else + { + gsi2 = gsi_for_stmt (latch_def); + gsi_next (&gsi2); + } for (unsigned i = 0; i < ncopies; ++i) {