On Thu, Jul 7, 2016 at 4:35 PM, Alan Hayward <alan.hayw...@arm.com> wrote:
> Ping.
Ok.
Richard.
>
> From: Alan Hayward <alan dot hayward at arm dot com>
> To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot
> org>
> Date: Wed, 29 Jun 2016 08:49:34 +0100
> Subject: [PATCH] PR 71667 - Handle live operations with DEBUG uses
> Authentication-results: sourceware.org; auth=none
>
> In vectorizable_live_operation() we always assume uses a of live operation
> will be PHIs. However, when using -g a use of a live operation might be a
> DEBUG stmt.
>
> This patch avoids adding any DEBUG statments to the worklist in
> vectorizable_live_operation(). Also fixes comment.
>
> Tested on x86 and aarch64.
> Ok to commit?
>
> gcc/
> PR tree-optimization/71667
> * tree-vect-loop.c (vectorizable_live_operation): ignore DEBUG stmts
>
> testsuite/gcc.dg/vect
> PR tree-optimization/71667
> * pr71667.c: New
>
>
>
> diff --git a/gcc/testsuite/gcc.dg/vect/pr71667.c
> b/gcc/testsuite/gcc.dg/vect/pr71667.c
> new file mode 100644
> index
> 0000000000000000000000000000000000000000..e7012efa882a5497b0a6099c3d853f9eb
> 375cc53
> --- /dev/null
> +++ b/gcc/testsuite/gcc.dg/vect/pr71667.c
> @@ -0,0 +1,30 @@
> +/* { dg-do compile } */
> +/* { dg-additional-options "-g" } */
> +
> +unsigned int mu;
> +int pt;
> +
> +void
> +qf (void)
> +{
> + int gy;
> + long int vz;
> +
> + for (;;)
> + {
> + for (gy = 0; gy < 80; ++gy)
> + {
> + vz = mu;
> + ++mu;
> + pt = (vz != 0) && (pt != 0);
> + }
> + while (gy < 81)
> + while (gy < 83)
> + {
> + vz = (vz != 0) ? 0 : mu;
> + ++gy;
> + }
> + pt = vz;
> + ++mu;
> + }
> +}
> diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
> index
> 6c0337bbbcbebd6443fd3bcef45c1b23a7833486..2980a1b031cd3b919369b5e31dff7e066
> 5bc7578 100644
> --- a/gcc/tree-vect-loop.c
> +++ b/gcc/tree-vect-loop.c
> @@ -6352,11 +6352,12 @@ vectorizable_live_operation (gimple *stmt,
> : gimple_get_lhs (stmt);
> lhs_type = TREE_TYPE (lhs);
>
> - /* Find all uses of STMT outside the loop - there should be exactly
> one. */
> + /* Find all uses of STMT outside the loop - there should be at least
> one. */
> auto_vec<gimple *, 4> worklist;
> FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, lhs)
> - if (!flow_bb_inside_loop_p (loop, gimple_bb (use_stmt)))
> - worklist.safe_push (use_stmt);
> + if (!flow_bb_inside_loop_p (loop, gimple_bb (use_stmt))
> + && !is_gimple_debug (use_stmt))
> + worklist.safe_push (use_stmt);
> gcc_assert (worklist.length () >= 1);
>
> bitsize = TYPE_SIZE (TREE_TYPE (vectype));
>
>
