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flow.c (struct propagate_block_info): Add mem_set_list_len. 

* flow.c (struct propagate_block_info): Add mem_set_list_len.
        (MAX_MEM_SET_LIST_LEN): New.
        (propagate_one_insn): Update mem_set_list_len.
        (invalidate_mems_from_autoinc): Likewise.
        (invalidate_mems_from_set): Likewise.
        (mark_used_regs): Likewise.
        (init_propagate_block_info): Likewise.  Stop collecting memories
        when we reach MAX_MEM_SET_LIST_LEN.
        (mark_set_1): Likewise.

From-SVN: r39065
This commit is contained in:
Richard Henderson 2001-01-16 05:57:17 -08:00 committed by Richard Henderson
parent c55fa4d6b1
commit 0875baa09e
2 changed files with 36 additions and 3 deletions
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12
gcc/ChangeLog
View File

@ -1,3 +1,15 @@
2001-01-16 Richard Henderson <rth@redhat.com>
* flow.c (struct propagate_block_info): Add mem_set_list_len.
(MAX_MEM_SET_LIST_LEN): New.
(propagate_one_insn): Update mem_set_list_len.
(invalidate_mems_from_autoinc): Likewise.
(invalidate_mems_from_set): Likewise.
(mark_used_regs): Likewise.
(init_propagate_block_info): Likewise. Stop collecting memories
when we reach MAX_MEM_SET_LIST_LEN.
(mark_set_1): Likewise.
2001-01-16 Richard Henderson <rth@redhat.com>
* unroll.c (precondition_loop_p): Fail if no iteration

27
gcc/flow.c
View File

@ -316,6 +316,9 @@ struct propagate_block_info
regset reg_cond_reg;
#endif
/* The length of mem_set_list. */
int mem_set_list_len;
/* Non-zero if the value of CC0 is live. */
int cc0_live;
@ -323,6 +326,10 @@ struct propagate_block_info
int flags;
};
/* Maximum length of pbi->mem_set_list before we start dropping
new elements on the floor. */
#define MAX_MEM_SET_LIST_LEN 100
/* Store the data structures necessary for depth-first search. */
struct depth_first_search_dsS {
/* stack for backtracking during the algorithm */
@ -3877,7 +3884,10 @@ propagate_one_insn (pbi, insn)
/* Non-constant calls clobber memory. */
if (! CONST_CALL_P (insn))
free_EXPR_LIST_list (&pbi->mem_set_list);
{
free_EXPR_LIST_list (&pbi->mem_set_list);
pbi->mem_set_list_len = 0;
}
/* There may be extra registers to be clobbered. */
for (note = CALL_INSN_FUNCTION_USAGE (insn);
@ -3967,6 +3977,7 @@ init_propagate_block_info (bb, live, local_set, cond_local_set, flags)
pbi->bb = bb;
pbi->reg_live = live;
pbi->mem_set_list = NULL_RTX;
pbi->mem_set_list_len = 0;
pbi->local_set = local_set;
pbi->cond_local_set = cond_local_set;
pbi->cc0_live = 0;
@ -4111,6 +4122,8 @@ init_propagate_block_info (bb, live, local_set, cond_local_set, flags)
mem = shallow_copy_rtx (mem);
#endif
pbi->mem_set_list = alloc_EXPR_LIST (0, mem, pbi->mem_set_list);
if (++pbi->mem_set_list_len >= MAX_MEM_SET_LIST_LEN)
break;
}
}
}
@ -4512,6 +4525,7 @@ invalidate_mems_from_autoinc (pbi, insn)
else
pbi->mem_set_list = next;
free_EXPR_LIST_node (temp);
pbi->mem_set_list_len--;
}
else
prev = temp;
@ -4547,6 +4561,7 @@ invalidate_mems_from_set (pbi, exp)
else
pbi->mem_set_list = next;
free_EXPR_LIST_node (temp);
pbi->mem_set_list_len--;
}
else
prev = temp;
@ -4743,7 +4758,8 @@ mark_set_1 (pbi, code, reg, cond, insn, flags)
if (insn && GET_CODE (reg) == MEM)
invalidate_mems_from_autoinc (pbi, insn);
if (GET_CODE (reg) == MEM && ! side_effects_p (reg)
if (pbi->mem_set_list_len < MAX_MEM_SET_LIST_LEN
&& GET_CODE (reg) == MEM && ! side_effects_p (reg)
/* ??? With more effort we could track conditional memory life. */
&& ! cond
/* We do not know the size of a BLKmode store, so we do not track
@ -4761,6 +4777,7 @@ mark_set_1 (pbi, code, reg, cond, insn, flags)
reg = shallow_copy_rtx (reg);
#endif
pbi->mem_set_list = alloc_EXPR_LIST (0, reg, pbi->mem_set_list);
pbi->mem_set_list_len++;
}
}
@ -5859,6 +5876,7 @@ mark_used_regs (pbi, x, cond, insn)
else
pbi->mem_set_list = next;
free_EXPR_LIST_node (temp);
pbi->mem_set_list_len--;
}
else
prev = temp;
@ -5996,7 +6014,10 @@ mark_used_regs (pbi, x, cond, insn)
So for now, just clear the memory set list and mark any regs
we can find in ASM_OPERANDS as used. */
if (code != ASM_OPERANDS || MEM_VOLATILE_P (x))
free_EXPR_LIST_list (&pbi->mem_set_list);
{
free_EXPR_LIST_list (&pbi->mem_set_list);
pbi->mem_set_list_len = 0;
}
/* For all ASM_OPERANDS, we must traverse the vector of input operands.
We can not just fall through here since then we would be confused