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flow.c (invalidate_mems_from_set): Split out from ...

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* flow.c (invalidate_mems_from_set): Split out from ...
        (mark_set_1): ... here.
        (try_pre_increment_1): Use it.  Use propagate_block_delete_insn
        instead of turning insn into a NOTE_INSN_DELETED.

From-SVN: r37356
This commit is contained in:
Richard Henderson 2000-11-09 18:03:28 -08:00 committed by Richard Henderson
parent 0170245936
commit 1288c070ab
2 changed files with 55 additions and 35 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2000-11-09 Richard Henderson <rth@redhat.com>
* flow.c (invalidate_mems_from_set): Split out from ...
(mark_set_1): ... here.
(try_pre_increment_1): Use it. Use propagate_block_delete_insn
instead of turning insn into a NOTE_INSN_DELETED.
2000-11-10 Joseph S. Myers <jsm28@cam.ac.uk>
* extend.texi, invoke.texi: Move documentation of builtin versions

83
gcc/flow.c
View File

@ -408,6 +408,8 @@ static void dump_edge_info PARAMS ((FILE *, edge, int));
static void invalidate_mems_from_autoinc PARAMS ((struct propagate_block_info *,
rtx));
static void invalidate_mems_from_set PARAMS ((struct propagate_block_info *,
rtx));
static void remove_fake_successors PARAMS ((basic_block));
static void flow_nodes_print PARAMS ((const char *, const sbitmap,
FILE *));
@ -4352,6 +4354,39 @@ invalidate_mems_from_autoinc (pbi, insn)
}
}
/* EXP is either a MEM or a REG. Remove any dependant entries
from pbi->mem_set_list. */
static void
invalidate_mems_from_set (pbi, exp)
struct propagate_block_info *pbi;
rtx exp;
{
rtx temp = pbi->mem_set_list;
rtx prev = NULL_RTX;
rtx next;
while (temp)
{
next = XEXP (temp, 1);
if ((GET_CODE (exp) == MEM
&& output_dependence (XEXP (temp, 0), exp))
|| (GET_CODE (exp) == REG
&& reg_overlap_mentioned_p (exp, XEXP (temp, 0))))
{
/* Splice this entry out of the list. */
if (prev)
XEXP (prev, 1) = next;
else
pbi->mem_set_list = next;
free_EXPR_LIST_node (temp);
}
else
prev = temp;
temp = next;
}
}
/* Process the registers that are set within X. Their bits are set to
1 in the regset DEAD, because they are dead prior to this insn.
@ -4533,31 +4568,7 @@ mark_set_1 (pbi, code, reg, cond, insn, flags)
if (optimize && (flags & PROP_SCAN_DEAD_CODE))
{
if (GET_CODE (reg) == MEM || GET_CODE (reg) == REG)
{
rtx temp = pbi->mem_set_list;
rtx prev = NULL_RTX;
rtx next;
while (temp)
{
next = XEXP (temp, 1);
if ((GET_CODE (reg) == MEM
&& output_dependence (XEXP (temp, 0), reg))
|| (GET_CODE (reg) == REG
&& reg_overlap_mentioned_p (reg, XEXP (temp, 0))))
{
/* Splice this entry out of the list. */
if (prev)
XEXP (prev, 1) = next;
else
pbi->mem_set_list = next;
free_EXPR_LIST_node (temp);
}
else
prev = temp;
temp = next;
}
}
invalidate_mems_from_set (pbi, reg);
/* If the memory reference had embedded side effects (autoincrement
address modes. Then we may need to kill some entries on the
@ -5763,22 +5774,24 @@ try_pre_increment_1 (pbi, insn)
&& ! dead_or_set_p (y, SET_DEST (x))
&& try_pre_increment (y, SET_DEST (x), amount))
{
/* We have found a suitable auto-increment
and already changed insn Y to do it.
So flush this increment-instruction. */
PUT_CODE (insn, NOTE);
NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
NOTE_SOURCE_FILE (insn) = 0;
/* Count a reference to this reg for the increment
insn we are deleting. When a reg is incremented.
spilling it is worse, so we want to make that
less likely. */
/* We have found a suitable auto-increment and already changed
insn Y to do it. So flush this increment instruction. */
propagate_block_delete_insn (pbi->bb, insn);
/* Count a reference to this reg for the increment insn we are
deleting. When a reg is incremented, spilling it is worse,
so we want to make that less likely. */
if (regno >= FIRST_PSEUDO_REGISTER)
{
REG_N_REFS (regno) += (optimize_size ? 1
: pbi->bb->loop_depth + 1);
REG_N_SETS (regno)++;
}
/* Flush any remembered memories depending on the value of
the incremented register. */
invalidate_mems_from_set (pbi, SET_DEST (x));
return 1;
}
return 0;