Has there been historical work done to investigate small integer optimization?

[Vincent Lefevre]

On 2024-02-12 13:01:45 +0100, Richard Biener wrote:
> Oh, and _mp_alloc < 0 could also simply mean the allocation is
> "inline", aka
> 
> typedef struct
> {
>   int _mp_alloc;                /* Number of *limbs* allocated and pointed
>                                    to by the _mp_d field.  */
>   int _mp_size;                 /* abs(_mp_size) is the number of limbs 
> the
>                                    last field points to.  If _mp_size is
>                                    negative this is a negative number.  */
>   union {
>      mp_limb_t *_mp_d;             /* Pointer to the limbs.  */
>      mp_limb_t _mp_inline_limbs[]; /* Inline limbs if _mp_alloc < 0.  */
>   };
> } __mpz_struct;

It is not possible to use a flexible array member in a union.

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