static void
find_flags_uses_in_insn (struct comparison *cmp, rtx_insn *insn)
{
df_ref use;
/* If we've already lost track of uses, don't bother collecting more. */
if (cmp->missing_uses)
return;
/* Find a USE of the flags register. */
FOR_EACH_INSN_USE (use, insn)
if (DF_REF_REGNO (use) == targetm.flags_regnum)
{
rtx x, *loc;
/* If this is an unusual use, quit. */
if (DF_REF_TYPE (use) != DF_REF_REG_USE)
goto fail;
/* If we've run out of slots to record uses, quit. */
if (cmp->n_uses == MAX_CMP_USE)
goto fail;
/* Unfortunately the location of the flags register, while present
in the reference structure, doesn't help. We need to find the
comparison code that is outer to the actual flags use. */
loc = DF_REF_LOC (use);
x = PATTERN (insn);
if (GET_CODE (x) == PARALLEL)
x = XVECEXP (x, 0, 0);
x = SET_SRC (x);
if (GET_CODE (x) == IF_THEN_ELSE)
x = XEXP (x, 0);
if (COMPARISON_P (x)
&& loc == &XEXP (x, 0)
&& XEXP (x, 1) == const0_rtx)
{
/* We've found a use of the flags that we understand. */
struct comparison_use *cuse = &cmp->uses[cmp->n_uses++];
cuse->insn = insn;
cuse->loc = loc;
cuse->code = GET_CODE (x);
}
else
goto fail;
}
return;
fail:
/* We failed to recognize this use of the flags register. */
cmp->missing_uses = true;
}
static void
union_match_dups (rtx insn, struct web_entry *def_entry,
struct web_entry *use_entry,
bool (*fun) (struct web_entry *, struct web_entry *))
{
struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
df_ref use_link = DF_INSN_INFO_USES (insn_info);
df_ref def_link = DF_INSN_INFO_DEFS (insn_info);
struct web_entry *dup_entry;
int i;
extract_insn (insn);
for (i = 0; i < recog_data.n_dups; i++)
{
int op = recog_data.dup_num[i];
enum op_type type = recog_data.operand_type[op];
df_ref ref, dupref;
struct web_entry *entry;
dup_entry = use_entry;
for (dupref = use_link; dupref; dupref = DF_REF_NEXT_LOC (dupref))
if (DF_REF_LOC (dupref) == recog_data.dup_loc[i])
break;
if (dupref == NULL && type == OP_INOUT)
{
dup_entry = def_entry;
for (dupref = def_link; dupref; dupref = DF_REF_NEXT_LOC (dupref))
if (DF_REF_LOC (dupref) == recog_data.dup_loc[i])
break;
}
/* ??? *DUPREF can still be zero, because when an operand matches
a memory, DF_REF_LOC (use_link[n]) points to the register part
of the address, whereas recog_data.dup_loc[m] points to the
entire memory ref, thus we fail to find the duplicate entry,
even though it is there.
Example: i686-pc-linux-gnu gcc.c-torture/compile/950607-1.c
-O3 -fomit-frame-pointer -funroll-loops */
if (dupref == NULL
|| DF_REF_REGNO (dupref) < FIRST_PSEUDO_REGISTER)
continue;
ref = type == OP_IN ? use_link : def_link;
entry = type == OP_IN ? use_entry : def_entry;
for (; ref; ref = DF_REF_NEXT_LOC (ref))
{
rtx *l = DF_REF_LOC (ref);
if (l == recog_data.operand_loc[op])
break;
if (l && DF_REF_REAL_LOC (ref) == recog_data.operand_loc[op])
break;
}
if (!ref && type == OP_INOUT)
{
entry = use_entry;
for (ref = use_link; ref; ref = DF_REF_NEXT_LOC (ref))
{
rtx *l = DF_REF_LOC (ref);
if (l == recog_data.operand_loc[op])
break;
if (l && DF_REF_REAL_LOC (ref) == recog_data.operand_loc[op])
break;
}
}
gcc_assert (ref);
(*fun) (dup_entry + DF_REF_ID (dupref), entry + DF_REF_ID (ref));
}
}
