Re: [PATCH] Ensure matching types in debug stmts created by tree-sra.c (PR tree-optimization/55920)

[Richard Biener <rguenther@suse.de>]

On Tue, 15 Jan 2013, Jakub Jelinek wrote:

> Hi!
> 
> This patch fixes ICE on the attached testcase on ARM, where we ended up
> creating invalid debug stmt, which had SImode var on the lhs, but BLKmode
> MEM_REF on the rhs.  Fixed by matching (almost, with the build_ref_for_model
> -> build_debug_ref_for_model change) what we do for normal stmt
> modifications earlier.
> 
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

Works for me.

Thanks,
Richard.

> 2013-01-15  Jakub Jelinek  <jakub@redhat.com>
> 
> 	PR tree-optimization/55920
> 	* tree-sra.c (sra_modify_assign): If for lacc->grp_to_be_debug_replaced
> 	there is non-useless type conversion needed from debug rhs to lhs,
> 	use build_debug_ref_for_model and/or VIEW_CONVERT_EXPR.
> 
> 	* gcc.c-torture/compile/pr55920.c: New test.
> 
> --- gcc/tree-sra.c.jj	2013-01-11 09:02:55.000000000 +0100
> +++ gcc/tree-sra.c	2013-01-15 12:52:01.161324202 +0100
> @@ -3108,8 +3108,20 @@ sra_modify_assign (gimple *stmt, gimple_
>  
>    if (lacc && lacc->grp_to_be_debug_replaced)
>      {
> -      gimple ds = gimple_build_debug_bind (get_access_replacement (lacc),
> -					   unshare_expr (rhs), *stmt);
> +      tree debug_lhs = get_access_replacement (lacc);
> +      tree debug_rhs = unshare_expr (rhs);
> +      if (!useless_type_conversion_p (TREE_TYPE (debug_lhs),
> +				      TREE_TYPE (debug_rhs)))
> +	{
> +	  if (AGGREGATE_TYPE_P (TREE_TYPE (debug_rhs))
> +	      && !contains_vce_or_bfcref_p (debug_rhs))
> +	    debug_rhs = build_debug_ref_for_model (loc, debug_rhs, 0, lacc);
> +	  if (!useless_type_conversion_p (TREE_TYPE (debug_lhs),
> +					  TREE_TYPE (debug_rhs)))
> +	    debug_rhs = fold_build1_loc (loc, VIEW_CONVERT_EXPR,
> +					 TREE_TYPE (debug_lhs), debug_rhs);
> +	}
> +      gimple ds = gimple_build_debug_bind (debug_lhs, debug_rhs, *stmt);
>        gsi_insert_before (gsi, ds, GSI_SAME_STMT);
>      }
>  
> --- gcc/testsuite/gcc.c-torture/compile/pr55920.c.jj	2013-01-15 12:58:01.782125163 +0100
> +++ gcc/testsuite/gcc.c-torture/compile/pr55920.c	2013-01-15 12:57:23.000000000 +0100
> @@ -0,0 +1,16 @@
> +/* PR tree-optimization/55920 */
> +
> +struct A { unsigned a; } __attribute__((packed));
> +struct B { int b; unsigned char c[16]; };
> +void bar (struct A);
> +
> +void
> +foo (struct B *x)
> +{
> +  struct A a;
> +  if (x->b)
> +    __builtin_memcpy (&a, x->c, sizeof a);
> +  else
> +    a.a = 0;
> +  bar (a);
> +}
> 
> 	Jakub
> 
> 

-- 
Richard Biener <rguenther@suse.de>
SUSE / SUSE Labs
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