niter: Fix up unused var warning [PR108457]

  Hi!

tree-ssa-loop-niter.cc (build_cltz_expr) gets unused variable mode
warning on some architectures where C[LT]Z_DEFINED_VALUE_AT_ZERO
macro(s) don't use the first argument (which includes the
defaults.h definitions of:
#define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
#define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
Other uses of this macro avoid this problem by avoiding temporaries
which are only used as argument to those macros, the following patch
does it the same way for consistency.  Plus some formatting fixes
while at it.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2023-01-19  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/108457
	* tree-ssa-loop-niter.cc (build_cltz_expr): Use
	SCALAR_INT_TYPE_MODE (utype) directly as C[LT]Z_DEFINED_VALUE_AT_ZERO
	argument instead of a temporary.  Formatting fixes.


	Jakub
  

On Thu, 19 Jan 2023, Jakub Jelinek wrote:

> Hi!
> 
> tree-ssa-loop-niter.cc (build_cltz_expr) gets unused variable mode
> warning on some architectures where C[LT]Z_DEFINED_VALUE_AT_ZERO
> macro(s) don't use the first argument (which includes the
> defaults.h definitions of:
> #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
> #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
> Other uses of this macro avoid this problem by avoiding temporaries
> which are only used as argument to those macros, the following patch
> does it the same way for consistency.  Plus some formatting fixes
> while at it.
> 
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

OK.

> 2023-01-19  Jakub Jelinek  <jakub@redhat.com>
> 
> 	PR tree-optimization/108457
> 	* tree-ssa-loop-niter.cc (build_cltz_expr): Use
> 	SCALAR_INT_TYPE_MODE (utype) directly as C[LT]Z_DEFINED_VALUE_AT_ZERO
> 	argument instead of a temporary.  Formatting fixes.
> 
> --- gcc/tree-ssa-loop-niter.cc.jj	2023-01-16 11:52:05.806885510 +0100
> +++ gcc/tree-ssa-loop-niter.cc	2023-01-19 13:10:42.872595970 +0100
> @@ -2252,16 +2252,16 @@ build_cltz_expr (tree src, bool leading,
>        call = build_call_expr_internal_loc (UNKNOWN_LOCATION, ifn,
>  					   integer_type_node, 1, src);
>        int val;
> -      scalar_int_mode mode = SCALAR_INT_TYPE_MODE (utype);
>        int optab_defined_at_zero
> -	= leading ? CLZ_DEFINED_VALUE_AT_ZERO (mode, val)
> -		  : CTZ_DEFINED_VALUE_AT_ZERO (mode, val);
> +	= (leading
> +	   ? CLZ_DEFINED_VALUE_AT_ZERO (SCALAR_INT_TYPE_MODE (utype), val)
> +	   : CTZ_DEFINED_VALUE_AT_ZERO (SCALAR_INT_TYPE_MODE (utype), val));
>        if (define_at_zero && !(optab_defined_at_zero == 2 && val == prec))
>  	{
>  	  tree is_zero = fold_build2 (NE_EXPR, boolean_type_node, src,
>  				      build_zero_cst (TREE_TYPE (src)));
> -	  call = fold_build3(COND_EXPR, integer_type_node, is_zero, call,
> -			     build_int_cst (integer_type_node, prec));
> +	  call = fold_build3 (COND_EXPR, integer_type_node, is_zero, call,
> +			      build_int_cst (integer_type_node, prec));
>  	}
>      }
>    else if (prec == 2 * lli_prec)
> @@ -2275,22 +2275,22 @@ build_cltz_expr (tree src, bool leading,
>        /* We count the zeroes in src1, and add the number in src2 when src1
>  	 is 0.  */
>        if (!leading)
> -	std::swap(src1, src2);
> +	std::swap (src1, src2);
>        tree call1 = build_call_expr (fn, 1, src1);
>        tree call2 = build_call_expr (fn, 1, src2);
>        if (define_at_zero)
>  	{
>  	  tree is_zero2 = fold_build2 (NE_EXPR, boolean_type_node, src2,
>  				       build_zero_cst (TREE_TYPE (src2)));
> -	  call2 = fold_build3(COND_EXPR, integer_type_node, is_zero2, call2,
> -			      build_int_cst (integer_type_node, lli_prec));
> +	  call2 = fold_build3 (COND_EXPR, integer_type_node, is_zero2, call2,
> +			       build_int_cst (integer_type_node, lli_prec));
>  	}
>        tree is_zero1 = fold_build2 (NE_EXPR, boolean_type_node, src1,
>  				   build_zero_cst (TREE_TYPE (src1)));
> -      call = fold_build3(COND_EXPR, integer_type_node, is_zero1, call1,
> -			 fold_build2 (PLUS_EXPR, integer_type_node, call2,
> -				      build_int_cst (integer_type_node,
> -						     lli_prec)));
> +      call = fold_build3 (COND_EXPR, integer_type_node, is_zero1, call1,
> +			  fold_build2 (PLUS_EXPR, integer_type_node, call2,
> +				       build_int_cst (integer_type_node,
> +						      lli_prec)));
>      }
>    else
>      {
> @@ -2302,14 +2302,13 @@ build_cltz_expr (tree src, bool leading,
>  	{
>  	  tree is_zero = fold_build2 (NE_EXPR, boolean_type_node, src,
>  				      build_zero_cst (TREE_TYPE (src)));
> -	  call = fold_build3(COND_EXPR, integer_type_node, is_zero, call,
> -			     build_int_cst (integer_type_node, prec));
> +	  call = fold_build3 (COND_EXPR, integer_type_node, is_zero, call,
> +			      build_int_cst (integer_type_node, prec));
>  	}
>  
>        if (leading && prec < i_prec)
> -	call = fold_build2(MINUS_EXPR, integer_type_node, call,
> -			   build_int_cst (integer_type_node,
> -					  i_prec - prec));
> +	call = fold_build2 (MINUS_EXPR, integer_type_node, call,
> +			    build_int_cst (integer_type_node, i_prec - prec));
>      }
>  
>    return call;
> 
> 	Jakub
> 
>