From 8cb0127dfd3d01d4549f3139b087d1a5966844ee Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Fri, 30 May 2025 14:11:47 +0200 Subject: tree-optimization/120357 - ICE with early break vectorization When doing early break vectorization of a loop with a conditional reduction the epilog creation code is confused as to before which exit to insert the conditional reduction induction IV update. The following make sure this is done before the main IV exit. PR tree-optimization/120357 * tree-vect-loop.cc (vect_create_epilog_for_reduction): Create the conditional reduction induction IV increment before the main IV exit. * gcc.dg/vect/vect-early-break_136-pr120357.c: New testcase. (cherry picked from commit dce4da51ab66c3abb84448326910cd42f6fe2499) --- gcc/testsuite/gcc.dg/vect/vect-early-break_136-pr120357.c | 13 +++++++++++++ gcc/tree-vect-loop.cc | 3 ++- 2 files changed, 15 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/gcc.dg/vect/vect-early-break_136-pr120357.c (limited to 'gcc') diff --git a/gcc/testsuite/gcc.dg/vect/vect-early-break_136-pr120357.c b/gcc/testsuite/gcc.dg/vect/vect-early-break_136-pr120357.c new file mode 100644 index 0000000..8a51cfc --- /dev/null +++ b/gcc/testsuite/gcc.dg/vect/vect-early-break_136-pr120357.c @@ -0,0 +1,13 @@ +/* { dg-do compile } */ +/* { dg-add-options vect_early_break } */ +/* { dg-additional-options "-O3" } */ + +char a; +unsigned long long t[2][22]; +int u[22]; +void f(void) +{ + for (int v = 0; v < 22; v++) + for (_Bool w = 0; w < (u[v] < 0) + 1; w = 1) + a *= 0 != t[w][v]; +} diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc index 2d35fa1..c824b5a 100644 --- a/gcc/tree-vect-loop.cc +++ b/gcc/tree-vect-loop.cc @@ -6189,7 +6189,8 @@ vect_create_epilog_for_reduction (loop_vec_info loop_vinfo, /* Create an induction variable. */ gimple_stmt_iterator incr_gsi; bool insert_after; - vect_iv_increment_position (loop_exit, &incr_gsi, &insert_after); + vect_iv_increment_position (LOOP_VINFO_IV_EXIT (loop_vinfo), + &incr_gsi, &insert_after); create_iv (series_vect, PLUS_EXPR, vec_step, NULL_TREE, loop, &incr_gsi, insert_after, &indx_before_incr, &indx_after_incr); -- cgit v1.1