/* Save and restore call-clobbered registers which are live across a call.
Copyright (C) 1989, 1992, 1994, 1995, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of GCC.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
+#include "regs.h"
#include "insn-config.h"
#include "flags.h"
-#include "regs.h"
#include "hard-reg-set.h"
#include "recog.h"
#include "basic-block.h"
insn. */
static HARD_REG_SET referenced_regs;
-/* Computed in mark_set_regs, holds all registers set by the current
- instruction. */
-static HARD_REG_SET this_insn_sets;
-
static void mark_set_regs (rtx, rtx, void *);
static void mark_referenced_regs (rtx);
[(int) MODE_BASE_REG_CLASS (regno_save_mode [i][1])], i))
break;
- if (i == FIRST_PSEUDO_REGISTER)
- abort ();
+ gcc_assert (i < FIRST_PSEUDO_REGISTER);
addr_reg = gen_rtx_REG (Pmode, i);
struct insn_chain *chain, *next;
enum machine_mode save_mode [FIRST_PSEUDO_REGISTER];
+ /* Computed in mark_set_regs, holds all registers set by the current
+ instruction. */
+ HARD_REG_SET this_insn_sets;
+
CLEAR_HARD_REG_SET (hard_regs_saved);
n_regs_saved = 0;
next = chain->next;
- if (chain->is_caller_save_insn)
- abort ();
+ gcc_assert (!chain->is_caller_save_insn);
if (INSN_P (insn))
{
if (code == CALL_INSN && ! find_reg_note (insn, REG_NORETURN, NULL))
{
- int regno;
+ unsigned regno;
HARD_REG_SET hard_regs_to_save;
+ reg_set_iterator rsi;
/* Use the register life information in CHAIN to compute which
regs are live during the call. */
/* Look through all live pseudos, mark their hard registers
and choose proper mode for saving. */
EXECUTE_IF_SET_IN_REG_SET
- (&chain->live_throughout, FIRST_PSEUDO_REGISTER, regno,
- {
- int r = reg_renumber[regno];
- int nregs;
-
- if (r >= 0)
- {
- enum machine_mode mode;
-
- nregs = hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)];
- mode = HARD_REGNO_CALLER_SAVE_MODE
- (r, nregs, PSEUDO_REGNO_MODE (regno));
- if (GET_MODE_BITSIZE (mode)
- > GET_MODE_BITSIZE (save_mode[r]))
- save_mode[r] = mode;
- while (nregs-- > 0)
- SET_HARD_REG_BIT (hard_regs_to_save, r + nregs);
- }
- else
- abort ();
- });
+ (&chain->live_throughout, FIRST_PSEUDO_REGISTER, regno, rsi)
+ {
+ int r = reg_renumber[regno];
+ int nregs;
+ enum machine_mode mode;
+
+ gcc_assert (r >= 0);
+ nregs = hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)];
+ mode = HARD_REGNO_CALLER_SAVE_MODE
+ (r, nregs, PSEUDO_REGNO_MODE (regno));
+ if (GET_MODE_BITSIZE (mode)
+ > GET_MODE_BITSIZE (save_mode[r]))
+ save_mode[r] = mode;
+ while (nregs-- > 0)
+ SET_HARD_REG_BIT (hard_regs_to_save, r + nregs);
+ }
/* Record all registers set in this call insn. These don't need
to be saved. N.B. the call insn might set a subreg of a
multi-hard-reg pseudo; then the pseudo is considered live
during the call, but the subreg that is set isn't. */
CLEAR_HARD_REG_SET (this_insn_sets);
- note_stores (PATTERN (insn), mark_set_regs, NULL);
+ note_stores (PATTERN (insn), mark_set_regs, &this_insn_sets);
+ /* Sibcalls are considered to set the return value,
+ compare flow.c:propagate_one_insn. */
+ if (SIBLING_CALL_P (insn) && current_function_return_rtx)
+ mark_set_regs (current_function_return_rtx, NULL_RTX,
+ &this_insn_sets);
/* Compute which hard regs must be saved before this call. */
AND_COMPL_HARD_REG_SET (hard_regs_to_save, call_fixed_reg_set);
if (n_regs_saved)
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (TEST_HARD_REG_BIT (hard_regs_saved, regno))
- regno += insert_restore (chain, GET_CODE (insn) == JUMP_INSN,
+ regno += insert_restore (chain, JUMP_P (insn),
regno, MOVE_MAX_WORDS, save_mode);
}
}
}
-/* Here from note_stores when an insn stores a value in a register.
+/* Here from note_stores, or directly from save_call_clobbered_regs, when
+ an insn stores a value in a register.
Set the proper bit or bits in this_insn_sets. All pseudos that have
been assigned hard regs have had their register number changed already,
so we can ignore pseudos. */
static void
-mark_set_regs (rtx reg, rtx setter ATTRIBUTE_UNUSED,
- void *data ATTRIBUTE_UNUSED)
+mark_set_regs (rtx reg, rtx setter ATTRIBUTE_UNUSED, void *data)
{
int regno, endregno, i;
enum machine_mode mode = GET_MODE (reg);
+ HARD_REG_SET *this_insn_sets = data;
if (GET_CODE (reg) == SUBREG)
{
rtx inner = SUBREG_REG (reg);
if (!REG_P (inner) || REGNO (inner) >= FIRST_PSEUDO_REGISTER)
return;
-
- regno = subreg_hard_regno (reg, 1);
+ regno = subreg_regno (reg);
}
else if (REG_P (reg)
&& REGNO (reg) < FIRST_PSEUDO_REGISTER)
endregno = regno + hard_regno_nregs[regno][mode];
for (i = regno; i < endregno; i++)
- SET_HARD_REG_BIT (this_insn_sets, i);
+ SET_HARD_REG_BIT (*this_insn_sets, i);
}
/* Here from note_stores when an insn stores a value in a register.
struct insn_chain *new;
rtx mem;
- /* A common failure mode if register status is not correct in the RTL
- is for this routine to be called with a REGNO we didn't expect to
- save. That will cause us to write an insn with a (nil) SET_DEST
- or SET_SRC. Instead of doing so and causing a crash later, check
- for this common case and abort here instead. This will remove one
- step in debugging such problems. */
-
- if (regno_save_mem[regno][1] == 0)
- abort ();
+ /* A common failure mode if register status is not correct in the
+ RTL is for this routine to be called with a REGNO we didn't
+ expect to save. That will cause us to write an insn with a (nil)
+ SET_DEST or SET_SRC. Instead of doing so and causing a crash
+ later, check for this common case here instead. This will remove
+ one step in debugging such problems. */
+ gcc_assert (regno_save_mem[regno][1]);
/* Get the pattern to emit and update our status.
struct insn_chain *new;
rtx mem;
- /* A common failure mode if register status is not correct in the RTL
- is for this routine to be called with a REGNO we didn't expect to
- save. That will cause us to write an insn with a (nil) SET_DEST
- or SET_SRC. Instead of doing so and causing a crash later, check
- for this common case and abort here instead. This will remove one
+ /* A common failure mode if register status is not correct in the
+ RTL is for this routine to be called with a REGNO we didn't
+ expect to save. That will cause us to write an insn with a (nil)
+ SET_DEST or SET_SRC. Instead of doing so and causing a crash
+ later, check for this common case here. This will remove one
step in debugging such problems. */
-
- if (regno_save_mem[regno][1] == 0)
- abort ();
+ gcc_assert (regno_save_mem[regno][1]);
/* Get the pattern to emit and update our status.
isn't a problem. We do, however, assume here that CALL_INSNs don't
reference CC0. Guard against non-INSN's like CODE_LABEL. */
- if ((GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN)
+ if ((NONJUMP_INSN_P (insn) || JUMP_P (insn))
&& before_p
&& reg_referenced_p (cc0_rtx, PATTERN (insn)))
chain = chain->prev, insn = chain->insn;
rtx reg = XEXP (link, 0);
int regno, i;
- if (!REG_P (reg))
- abort ();
-
+ gcc_assert (REG_P (reg));
regno = REGNO (reg);
if (regno >= FIRST_PSEUDO_REGISTER)
regno = reg_renumber[regno];
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