https://gcc.gnu.org/g:5020a4d96413ee79b01606e270336b4a758033b9
commit r15-11231-g5020a4d96413ee79b01606e270336b4a758033b9 Author: Richard Biener <[email protected]> Date: Sun Apr 26 11:16:33 2026 +0200 tree-optimization/125019 - fix ICE with recurrence vectorization This fixes an oversight with the PR124677 fix. PR tree-optimization/125019 * tree-vect-loop.cc (vectorizable_recurr): Properly guard against hitting last stmt when searching for the insertion place. * gcc.dg/pr125019.c: New testcase. (cherry picked from commit 0ecc55faf01e4ebd674d8e1a41712c9762c521aa) Diff: --- gcc/testsuite/gcc.dg/pr125019.c | 12 ++++++++++++ gcc/tree-vect-loop.cc | 2 +- 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/gcc/testsuite/gcc.dg/pr125019.c b/gcc/testsuite/gcc.dg/pr125019.c new file mode 100644 index 000000000000..0cdb5906de76 --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr125019.c @@ -0,0 +1,12 @@ +/* { dg-do compile } */ +/* { dg-options "-O3 -fno-vect-cost-model -fno-tree-dce -fno-tree-pre" } */ + +int a, b, c, d; +void e(unsigned f) { + for (c = 0; c < 2; c++) { + b = d; + d = f; + for (a = 0; a < 2; a++) + ; + } +} diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc index c3e5bbad4412..0098a582fa71 100644 --- a/gcc/tree-vect-loop.cc +++ b/gcc/tree-vect-loop.cc @@ -9804,7 +9804,7 @@ vectorizable_recurr (loop_vec_info loop_vinfo, stmt_vec_info stmt_info, } /* Skip inserted vectorized stmts for the latch definition. We have to insert after those. */ - while (gimple_uid (gsi_stmt (gsi2)) == 0); + while (gsi_stmt (gsi2) && gimple_uid (gsi_stmt (gsi2)) == 0); for (unsigned i = 0; i < ncopies; ++i) {
