I agree with Richard's comments, but a couple more:

Robin Dapp <rdapp....@gmail.com> writes:
> @@ -362,6 +363,23 @@ add_mask_and_len_args (expand_operand *ops, unsigned int 
> opno, gcall *stmt)
>  
>        create_input_operand (&ops[opno++], mask_rtx,
>                           TYPE_MODE (TREE_TYPE (mask)));
> +

Nit: unnecessary blank line.

> [...]
> +/* Return true if the else value ELSE_VAL (one of MASK_LOAD_ELSE_ZERO,
> +   MASK_LOAD_ELSE_M1, and MASK_LOAD_ELSE_UNDEFINED) is valid fo the optab
> +   referred to by ICODE.  The index of the else operand must be specified
> +   in ELSE_INDEX.  */
> +
> +bool
> +supported_else_val_p (enum insn_code icode, unsigned else_index, int 
> else_val)
> +{
> +  if (else_val != MASK_LOAD_ELSE_ZERO && else_val != MASK_LOAD_ELSE_M1
> +      && else_val != MASK_LOAD_ELSE_UNDEFINED)
> +    __builtin_unreachable ();

gcc_unreachable (), so that it's a noisy failure when checking is enabled
(and so that it works on host compilers that don't provide
__builtin_unreachable).

Thanks,
Richard

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