static int hard_reg_set_here_p (unsigned int, unsigned int, rtx);
static struct decomposition decompose (rtx);
static int immune_p (rtx, rtx, struct decomposition);
-static int alternative_allows_memconst (const char *, int);
+static bool alternative_allows_const_pool_ref (rtx, const char *, int);
static rtx find_reloads_toplev (rtx, int, enum reload_type, int, int, rtx,
int *);
static rtx make_memloc (rtx, int);
if (MERGE_TO_OTHER (secondary_type, rld[s_reload].when_needed,
opnum, rld[s_reload].opnum))
rld[s_reload].when_needed = RELOAD_OTHER;
+
+ break;
}
if (s_reload == n_reloads)
if (outmode == VOIDmode && out != 0)
outmode = GET_MODE (out);
- /* If IN is a pseudo register everywhere-equivalent to a constant, and
- it is not in a hard register, reload straight from the constant,
- since we want to get rid of such pseudo registers.
- Often this is done earlier, but not always in find_reloads_address. */
+ /* If find_reloads and friends until now missed to replace a pseudo
+ with a constant of reg_equiv_constant something went wrong
+ beforehand.
+ Note that it can't simply be done here if we missed it earlier
+ since the constant might need to be pushed into the literal pool
+ and the resulting memref would probably need further
+ reloading. */
if (in != 0 && REG_P (in))
{
int regno = REGNO (in);
- if (regno >= FIRST_PSEUDO_REGISTER && reg_renumber[regno] < 0
- && reg_equiv_constant[regno] != 0)
- in = reg_equiv_constant[regno];
+ gcc_assert (regno < FIRST_PSEUDO_REGISTER
+ || reg_renumber[regno] >= 0
+ || reg_equiv_constant[regno] == NULL_RTX);
}
- /* Likewise for OUT. Of course, OUT will never be equivalent to
- an actual constant, but it might be equivalent to a memory location
- (in the case of a parameter). */
+ /* reg_equiv_constant only contains constants which are obviously
+ not appropriate as destination. So if we would need to replace
+ the destination pseudo with a constant we are in real
+ trouble. */
if (out != 0 && REG_P (out))
{
int regno = REGNO (out);
- if (regno >= FIRST_PSEUDO_REGISTER && reg_renumber[regno] < 0
- && reg_equiv_constant[regno] != 0)
- out = reg_equiv_constant[regno];
+ gcc_assert (regno < FIRST_PSEUDO_REGISTER
+ || reg_renumber[regno] >= 0
+ || reg_equiv_constant[regno] == NULL_RTX);
}
/* If we have a read-write operand with an address side-effect,
|| no_input_reloads)
&& operand_mode[i] != VOIDmode)
{
+ int this_address_reloaded;
+
+ this_address_reloaded = 0;
substed_operand[i] = recog_data.operand[i]
= find_reloads_toplev (force_const_mem (operand_mode[i],
recog_data.operand[i]),
i, address_type[i], ind_levels, 0, insn,
- NULL);
- if (alternative_allows_memconst (recog_data.constraints[i],
- goal_alternative_number))
+ &this_address_reloaded);
+ if (alternative_allows_const_pool_ref (this_address_reloaded == 0
+ ? substed_operand[i]
+ : NULL,
+ recog_data.constraints[i],
+ goal_alternative_number))
goal_alternative_win[i] = 1;
}
return retval;
}
-/* Return 1 if alternative number ALTNUM in constraint-string CONSTRAINT
- accepts a memory operand with constant address. */
+/* Return true if alternative number ALTNUM in constraint-string
+ CONSTRAINT is guaranteed to accept a reloaded constant-pool reference.
+ MEM gives the reference if it didn't need any reloads, otherwise it
+ is null. */
-static int
-alternative_allows_memconst (const char *constraint, int altnum)
+static bool
+alternative_allows_const_pool_ref (rtx mem, const char *constraint, int altnum)
{
int c;
+
/* Skip alternatives before the one requested. */
while (altnum > 0)
{
altnum--;
}
/* Scan the requested alternative for 'm' or 'o'.
- If one of them is present, this alternative accepts memory constants. */
+ If one of them is present, this alternative accepts the result of
+ passing a constant-pool reference through find_reloads_toplev.
+
+ The same is true of extra memory constraints if the address
+ was reloaded into a register. However, the target may elect
+ to disallow the original constant address, forcing it to be
+ reloaded into a register instead. */
for (; (c = *constraint) && c != ',' && c != '#';
constraint += CONSTRAINT_LEN (c, constraint))
- if (c == 'm' || c == 'o' || EXTRA_MEMORY_CONSTRAINT (c, constraint))
- return 1;
- return 0;
+ {
+ if (c == 'm' || c == 'o')
+ return true;
+#ifdef EXTRA_CONSTRAINT_STR
+ if (EXTRA_MEMORY_CONSTRAINT (c, constraint)
+ && (mem == NULL || EXTRA_CONSTRAINT_STR (mem, c, constraint)))
+ return true;
+#endif
+ }
+ return false;
}
\f
/* Scan X for memory references and scan the addresses for reloading.
{
regno = REGNO (ad);
- /* If the register is equivalent to an invariant expression, substitute
- the invariant, and eliminate any eliminable register references. */
- tem = reg_equiv_constant[regno];
- if (tem != 0
- && (tem = eliminate_regs (tem, mode, insn))
- && strict_memory_address_p (mode, tem))
+ if (reg_equiv_constant[regno] != 0)
{
- *loc = ad = tem;
- return 0;
+ find_reloads_address_part (reg_equiv_constant[regno], loc,
+ base_reg_class (mode, MEM, SCRATCH),
+ GET_MODE (ad), opnum, type, ind_levels);
+ return 1;
}
tem = reg_equiv_memory_loc[regno];
}
}
- /* If we have a hard register that is ok as an index,
- don't make a reload. If an autoincrement of a nice register
+ /* If we have a hard register that is ok in this incdec context,
+ don't make a reload. If the register isn't nice enough for
+ autoincdec, we can reload it. But, if an autoincrement of a
+ register that we here verified as playing nice, still outside
isn't "valid", it must be that no autoincrement is "valid".
If that is true and something made an autoincrement anyway,
this must be a special context where one is allowed.
if (reg_renumber[regno] >= 0)
regno = reg_renumber[regno];
if (regno >= FIRST_PSEUDO_REGISTER
- || !REG_OK_FOR_CONTEXT (context, regno, mode, outer_code,
+ || !REG_OK_FOR_CONTEXT (context, regno, mode, code,
index_code))
{
int reloadnum;
else
{
reloadnum
- = push_reload (x, NULL_RTX, loc, (rtx*) 0,
+ = push_reload (x, x, loc, (rtx*) 0,
context_reg_class,
GET_MODE (x), GET_MODE (x), 0, 0,
opnum, type);
XEXP (tem, 0) = plus_constant (XEXP (tem, 0), offset);
PUT_MODE (tem, GET_MODE (x));
+ if (MEM_OFFSET (tem))
+ set_mem_offset (tem, plus_constant (MEM_OFFSET (tem), offset));
/* If this was a paradoxical subreg that we replaced, the
resulting memory must be sufficiently aligned to allow
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