static bool reg_killed_on_edge (rtx, edge);
static bool reg_used_on_edge (rtx, edge);
-static rtx reg_set_between_after_reload_p (rtx, rtx, rtx);
-static rtx reg_used_between_after_reload_p (rtx, rtx, rtx);
static rtx get_avail_load_store_reg (rtx);
static bool bb_has_well_behaved_predecessors (basic_block);
fprintf (file, "\n");
}
\f
+/* Return true if register X is recorded as being set by an instruction
+ whose CUID is greater than the one given. */
+
+static bool
+reg_changed_after_insn_p (rtx x, int cuid)
+{
+ unsigned int regno, end_regno;
+
+ regno = REGNO (x);
+ end_regno = END_HARD_REGNO (x);
+ do
+ if (reg_avail_info[regno] > cuid)
+ return true;
+ while (++regno < end_regno);
+ return false;
+}
/* Return nonzero if the operands of expression X are unchanged
1) from the start of INSN's basic block up to but not including INSN
/* We are called after register allocation. */
gcc_assert (REGNO (x) < FIRST_PSEUDO_REGISTER);
if (after_insn)
- /* If the last CUID setting the insn is less than the CUID of
- INSN, then reg X is not changed in or after INSN. */
- return reg_avail_info[REGNO (x)] < INSN_CUID (insn);
+ return !reg_changed_after_insn_p (x, INSN_CUID (insn) - 1);
else
- /* Reg X is not set before INSN in the current basic block if
- we have not yet recorded the CUID of an insn that touches
- the reg. */
- return reg_avail_info[REGNO (x)] == 0;
+ return !reg_changed_after_insn_p (x, 0);
case MEM:
if (load_killed_in_block_p (INSN_CUID (insn), x, after_insn))
/* Finally, if this is a call, record all call clobbers. */
if (CALL_P (insn))
{
- unsigned int regno;
+ unsigned int regno, end_regno;
+ rtx link, x;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (TEST_HARD_REG_BIT (regs_invalidated_by_call, regno))
record_last_reg_set_info (insn, regno);
+ for (link = CALL_INSN_FUNCTION_USAGE (insn); link; link = XEXP (link, 1))
+ if (GET_CODE (XEXP (link, 0)) == CLOBBER)
+ {
+ x = XEXP (XEXP (link, 0), 0);
+ if (REG_P (x))
+ {
+ gcc_assert (HARD_REGISTER_P (x));
+ regno = REGNO (x);
+ end_regno = END_HARD_REGNO (x);
+ do
+ record_last_reg_set_info (insn, regno);
+ while (++regno < end_regno);
+ }
+ }
+
if (! CONST_OR_PURE_CALL_P (insn))
record_last_mem_set_info (insn);
}
return false;
}
\f
-
-/* Return the insn that sets register REG or clobbers it in between
- FROM_INSN and TO_INSN (exclusive of those two).
- Just like reg_set_between but for hard registers and not pseudos. */
-
-static rtx
-reg_set_between_after_reload_p (rtx reg, rtx from_insn, rtx to_insn)
-{
- rtx insn;
-
- /* We are called after register allocation. */
- gcc_assert (REG_P (reg) && REGNO (reg) < FIRST_PSEUDO_REGISTER);
-
- if (from_insn == to_insn)
- return NULL_RTX;
-
- for (insn = NEXT_INSN (from_insn);
- insn != to_insn;
- insn = NEXT_INSN (insn))
- if (INSN_P (insn))
- {
- if (set_of (reg, insn) != NULL_RTX)
- return insn;
- if ((CALL_P (insn)
- && call_used_regs[REGNO (reg)])
- || find_reg_fusage (insn, CLOBBER, reg))
- return insn;
-
- if (FIND_REG_INC_NOTE (insn, reg))
- return insn;
- }
-
- return NULL_RTX;
-}
-
-/* Return the insn that uses register REG in between FROM_INSN and TO_INSN
- (exclusive of those two). Similar to reg_used_between but for hard
- registers and not pseudos. */
-
-static rtx
-reg_used_between_after_reload_p (rtx reg, rtx from_insn, rtx to_insn)
-{
- rtx insn;
-
- /* We are called after register allocation. */
- gcc_assert (REG_P (reg) && REGNO (reg) < FIRST_PSEUDO_REGISTER);
-
- if (from_insn == to_insn)
- return NULL_RTX;
-
- for (insn = NEXT_INSN (from_insn);
- insn != to_insn;
- insn = NEXT_INSN (insn))
- if (INSN_P (insn))
- {
- if (reg_overlap_mentioned_p (reg, PATTERN (insn))
- || (CALL_P (insn)
- && call_used_regs[REGNO (reg)])
- || find_reg_fusage (insn, USE, reg)
- || find_reg_fusage (insn, CLOBBER, reg))
- return insn;
-
- if (FIND_REG_INC_NOTE (insn, reg))
- return insn;
- }
-
- return NULL_RTX;
-}
-
-/* Return true if REG is used, set, or killed between the beginning of
- basic block BB and UP_TO_INSN. Caches the result in reg_avail_info. */
-
-static bool
-reg_set_or_used_since_bb_start (rtx reg, basic_block bb, rtx up_to_insn)
-{
- rtx insn, start = PREV_INSN (BB_HEAD (bb));
-
- if (reg_avail_info[REGNO (reg)] != 0)
- return true;
-
- insn = reg_used_between_after_reload_p (reg, start, up_to_insn);
- if (! insn)
- insn = reg_set_between_after_reload_p (reg, start, up_to_insn);
-
- if (insn)
- reg_avail_info[REGNO (reg)] = INSN_CUID (insn);
-
- return insn != NULL_RTX;
-}
-
/* Return the loaded/stored register of a load/store instruction. */
static rtx
/* Check that the loaded register is not used, set, or killed from the
beginning of the block. */
- if (reg_set_or_used_since_bb_start (dest, bb, insn))
+ if (reg_changed_after_insn_p (dest, 0)
+ || reg_used_between_p (dest, PREV_INSN (BB_HEAD (bb)), insn))
return;
/* Check potential for replacing load with copy for predecessors. */
avail_insn = NULL;
continue;
}
- if (! reg_set_between_after_reload_p (avail_reg, avail_insn,
- next_pred_bb_end))
+ if (!reg_set_between_p (avail_reg, avail_insn, next_pred_bb_end))
/* AVAIL_INSN remains non-null. */
break;
else
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