On Sun, May 1, 2011 at 12:52 PM, Steven Bosscher <stevenb....@gmail.com> wrote:
> Hi,
>
> I noticed that this field is write-only. The last use was for store
> motion, which overloaded this 'loads' field with ANTIC_STORE_LIST. I
> went back as far as gcc 3.3.6 but couldn't figure out what the field
> is supposed to do for load motion. So this patch simply removes the
> field.
>
> Makes Nathan's EXPR_LIST/INSN_LIST a bit easier, too :-)
>
> Bootstrapped&tested on x86_64-unknown-linux-gnu. OK for trunk?
Ok.
Thanks,
Richard.
> Ciao!
> Steven
>
>
>
> * gcse.c (struct ls_expr): Remove 'loads' member.
> (ldst_entry): Don't initialize it.
> (free_ldst_entry): Don't free it.
> (print_ldst_list): Don't dump it.
> (compute_ld_motion_mems): Don't allocate it.
>
> Index: gcse.c
> ===================================================================
> --- gcse.c (revision 173214)
> +++ gcse.c (working copy)
> @@ -360,7 +360,6 @@ struct ls_expr
> struct expr * expr; /* Gcse expression reference for LM. */
> rtx pattern; /* Pattern of this mem. */
> rtx pattern_regs; /* List of registers mentioned by the mem. */
> - rtx loads; /* INSN list of loads seen. */
> rtx stores; /* INSN list of stores seen. */
> struct ls_expr * next; /* Next in the list. */
> int invalid; /* Invalid for some reason. */
> @@ -3300,7 +3299,6 @@ ldst_entry (rtx x)
> ptr->expr = NULL;
> ptr->pattern = x;
> ptr->pattern_regs = NULL_RTX;
> - ptr->loads = NULL_RTX;
> ptr->stores = NULL_RTX;
> ptr->reaching_reg = NULL_RTX;
> ptr->invalid = 0;
> @@ -3317,7 +3315,6 @@ ldst_entry (rtx x)
> static void
> free_ldst_entry (struct ls_expr * ptr)
> {
> - free_INSN_LIST_list (& ptr->loads);
> free_INSN_LIST_list (& ptr->stores);
>
> free (ptr);
> @@ -3359,13 +3356,6 @@ print_ldst_list (FILE * file)
>
> print_rtl (file, ptr->pattern);
>
> - fprintf (file, "\n Loads : ");
> -
> - if (ptr->loads)
> - print_rtl (file, ptr->loads);
> - else
> - fprintf (file, "(nil)");
> -
> fprintf (file, "\n Stores : ");
>
> if (ptr->stores)
> @@ -3517,9 +3507,7 @@ compute_ld_motion_mems (void)
> if (MEM_P (src) && simple_mem (src))
> {
> ptr = ldst_entry (src);
> - if (REG_P (dest))
> - ptr->loads = alloc_INSN_LIST (insn, ptr->loads);
> - else
> + if (! REG_P (dest))
> ptr->invalid = 1;
> }
> else
>
