VECT: Support SLP MASK_LEN_GATHER_LOAD with conditional mask

This patch leverage current MASK_GATHER_LOAD to support SLP MASK_LEN_GATHER_LOAD with condtional mask.

Unconditional MASK_LEN_GATHER_LOAD (base, offset, scale, zero, -1) SLP is not included in this patch
since it seems that we can't support it in the middle-end (due to PR44306).

May be we should support GATHER_LOAD explictily in RISC-V backend to walk around this issue.

I am gonna support GATHER_LOAD explictly work around in RISC-V backend.

This patch also adds conditional gather load test since there is no conditional gather load test.

Ok for trunk ? 

gcc/ChangeLog:

	* tree-vect-slp.cc (vect_get_operand_map): Add MASK_LEN_GATHER_LOAD.
	(vect_build_slp_tree_1): Ditto.
	(vect_build_slp_tree_2): Ditto.

gcc/testsuite/ChangeLog:

	* gcc.dg/vect/vect-gather-6.c: New test.

---
 gcc/testsuite/gcc.dg/vect/vect-gather-6.c | 15 +++++++++++++++
 gcc/tree-vect-slp.cc                      |  8 ++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-gather-6.c

On Thu, 26 Oct 2023, Juzhe-Zhong wrote:

> This patch leverage current MASK_GATHER_LOAD to support SLP MASK_LEN_GATHER_LOAD with condtional mask.
> 
> Unconditional MASK_LEN_GATHER_LOAD (base, offset, scale, zero, -1) SLP is not included in this patch
> since it seems that we can't support it in the middle-end (due to PR44306).

That bug number is off I believe.

> May be we should support GATHER_LOAD explictily in RISC-V backend to walk around this issue.
> 
> I am gonna support GATHER_LOAD explictly work around in RISC-V backend.
> 
> This patch also adds conditional gather load test since there is no conditional gather load test.
> 
> Ok for trunk ? 
> 
> gcc/ChangeLog:
> 
> 	* tree-vect-slp.cc (vect_get_operand_map): Add MASK_LEN_GATHER_LOAD.
> 	(vect_build_slp_tree_1): Ditto.
> 	(vect_build_slp_tree_2): Ditto.
> 
> gcc/testsuite/ChangeLog:
> 
> 	* gcc.dg/vect/vect-gather-6.c: New test.
> 
> ---
>  gcc/testsuite/gcc.dg/vect/vect-gather-6.c | 15 +++++++++++++++
>  gcc/tree-vect-slp.cc                      |  8 ++++++--
>  2 files changed, 21 insertions(+), 2 deletions(-)
>  create mode 100644 gcc/testsuite/gcc.dg/vect/vect-gather-6.c
> 
> diff --git a/gcc/testsuite/gcc.dg/vect/vect-gather-6.c b/gcc/testsuite/gcc.dg/vect/vect-gather-6.c
> new file mode 100644
> index 00000000000..ff55f321854
> --- /dev/null
> +++ b/gcc/testsuite/gcc.dg/vect/vect-gather-6.c
> @@ -0,0 +1,15 @@
> +/* { dg-do compile } */
> +
> +void
> +f (int *restrict y, int *restrict x, int *restrict indices, int *restrict cond, int n)
> +{
> +  for (int i = 0; i < n; ++i)
> +    {
> +      if (cond[i * 2])
> +	y[i * 2] = x[indices[i * 2]] + 1;
> +      if (cond[i * 2 + 1])
> +	y[i * 2 + 1] = x[indices[i * 2 + 1]] + 2;
> +    }
> +}
> +
> +/* { dg-final { scan-tree-dump "Loop contains only SLP stmts" vect { target vect_gather_load_ifn } } } */
> diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
> index 5eb310eceaf..0c197b50054 100644
> --- a/gcc/tree-vect-slp.cc
> +++ b/gcc/tree-vect-slp.cc
> @@ -564,6 +564,7 @@ vect_get_operand_map (const gimple *stmt, bool gather_scatter_p = false,
>  	    return arg1_map;
>  
>  	  case IFN_MASK_GATHER_LOAD:
> +	  case IFN_MASK_LEN_GATHER_LOAD:
>  	    return arg1_arg4_map;
>  
>  	  case IFN_MASK_STORE:
> @@ -1158,7 +1159,8 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char *swap,
>  
>  	  if (cfn == CFN_MASK_LOAD
>  	      || cfn == CFN_GATHER_LOAD
> -	      || cfn == CFN_MASK_GATHER_LOAD)
> +	      || cfn == CFN_MASK_GATHER_LOAD
> +				|| cfn == CFN_MASK_LEN_GATHER_LOAD)

somehow whitespace is mangled here and below, please fix.

Otherwise OK.

Thanks,
Richard.

>  	    ldst_p = true;
>  	  else if (cfn == CFN_MASK_STORE)
>  	    {
> @@ -1425,6 +1427,7 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char *swap,
>  	  if (DR_IS_READ (STMT_VINFO_DATA_REF (stmt_info))
>  	      && rhs_code != CFN_GATHER_LOAD
>  	      && rhs_code != CFN_MASK_GATHER_LOAD
> +				&& rhs_code != CFN_MASK_LEN_GATHER_LOAD
>  	      && !STMT_VINFO_GATHER_SCATTER_P (stmt_info)
>  	      /* Not grouped loads are handled as externals for BB
>  		 vectorization.  For loop vectorization we can handle
> @@ -1927,7 +1930,8 @@ vect_build_slp_tree_2 (vec_info *vinfo, slp_tree node,
>        if (gcall *stmt = dyn_cast <gcall *> (stmt_info->stmt))
>  	gcc_assert (gimple_call_internal_p (stmt, IFN_MASK_LOAD)
>  		    || gimple_call_internal_p (stmt, IFN_GATHER_LOAD)
> -		    || gimple_call_internal_p (stmt, IFN_MASK_GATHER_LOAD));
> +		    || gimple_call_internal_p (stmt, IFN_MASK_GATHER_LOAD)
> +				|| gimple_call_internal_p (stmt, IFN_MASK_LEN_GATHER_LOAD));
>        else if (STMT_VINFO_GATHER_SCATTER_P (stmt_info))
>  	gcc_assert (DR_IS_READ (STMT_VINFO_DATA_REF (stmt_info)));
>        else
>