/* Emit RTL for the GCC expander.
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
Free Software Foundation, Inc.
This file is part of GCC.
return rt_val;
}
\f
+/* Return the number of bytes between the start of an OUTER_MODE
+ in-memory value and the start of an INNER_MODE in-memory value,
+ given that the former is a lowpart of the latter. It may be a
+ paradoxical lowpart, in which case the offset will be negative
+ on big-endian targets. */
+
+int
+byte_lowpart_offset (enum machine_mode outer_mode,
+ enum machine_mode inner_mode)
+{
+ if (GET_MODE_SIZE (outer_mode) < GET_MODE_SIZE (inner_mode))
+ return subreg_lowpart_offset (outer_mode, inner_mode);
+ else
+ return -subreg_lowpart_offset (inner_mode, outer_mode);
+}
+\f
/* Generate a REG rtx for a new pseudo register of mode MODE.
This pseudo is assigned the next sequential register number. */
return val;
}
-/* Update NEW with the same attributes as REG, but offsetted by OFFSET.
- Do the big endian correction if needed. */
+/* Update NEW with the same attributes as REG, but with OFFSET added
+ to the REG_OFFSET. */
static void
update_reg_offset (rtx new, rtx reg, int offset)
{
- tree decl;
- HOST_WIDE_INT var_size;
-
- /* PR middle-end/14084
- The problem appears when a variable is stored in a larger register
- and later it is used in the original mode or some mode in between
- or some part of variable is accessed.
-
- On little endian machines there is no problem because
- the REG_OFFSET of the start of the variable is the same when
- accessed in any mode (it is 0).
-
- However, this is not true on big endian machines.
- The offset of the start of the variable is different when accessed
- in different modes.
- When we are taking a part of the REG we have to change the OFFSET
- from offset WRT size of mode of REG to offset WRT size of variable.
-
- If we would not do the big endian correction the resulting REG_OFFSET
- would be larger than the size of the DECL.
-
- Examples of correction, for BYTES_BIG_ENDIAN WORDS_BIG_ENDIAN machine:
-
- REG.mode MODE DECL size old offset new offset description
- DI SI 4 4 0 int32 in SImode
- DI SI 1 4 0 char in SImode
- DI QI 1 7 0 char in QImode
- DI QI 4 5 1 1st element in QImode
- of char[4]
- DI HI 4 6 2 1st element in HImode
- of int16[2]
-
- If the size of DECL is equal or greater than the size of REG
- we can't do this correction because the register holds the
- whole variable or a part of the variable and thus the REG_OFFSET
- is already correct. */
-
- decl = REG_EXPR (reg);
- if ((BYTES_BIG_ENDIAN || WORDS_BIG_ENDIAN)
- && decl != NULL
- && offset > 0
- && GET_MODE_SIZE (GET_MODE (reg)) > GET_MODE_SIZE (GET_MODE (new))
- && ((var_size = int_size_in_bytes (TREE_TYPE (decl))) > 0
- && var_size < GET_MODE_SIZE (GET_MODE (reg))))
- {
- int offset_le;
-
- /* Convert machine endian to little endian WRT size of mode of REG. */
- if (WORDS_BIG_ENDIAN)
- offset_le = ((GET_MODE_SIZE (GET_MODE (reg)) - 1 - offset)
- / UNITS_PER_WORD) * UNITS_PER_WORD;
- else
- offset_le = (offset / UNITS_PER_WORD) * UNITS_PER_WORD;
-
- if (BYTES_BIG_ENDIAN)
- offset_le += ((GET_MODE_SIZE (GET_MODE (reg)) - 1 - offset)
- % UNITS_PER_WORD);
- else
- offset_le += offset % UNITS_PER_WORD;
-
- if (offset_le >= var_size)
- {
- /* MODE is wider than the variable so the new reg will cover
- the whole variable so the resulting OFFSET should be 0. */
- offset = 0;
- }
- else
- {
- /* Convert little endian to machine endian WRT size of variable. */
- if (WORDS_BIG_ENDIAN)
- offset = ((var_size - 1 - offset_le)
- / UNITS_PER_WORD) * UNITS_PER_WORD;
- else
- offset = (offset_le / UNITS_PER_WORD) * UNITS_PER_WORD;
-
- if (BYTES_BIG_ENDIAN)
- offset += ((var_size - 1 - offset_le)
- % UNITS_PER_WORD);
- else
- offset += offset_le % UNITS_PER_WORD;
- }
- }
-
REG_ATTRS (new) = get_reg_attrs (REG_EXPR (reg),
REG_OFFSET (reg) + offset);
}
-/* Generate a register with same attributes as REG, but offsetted by
- OFFSET. */
+/* Generate a register with same attributes as REG, but with OFFSET
+ added to the REG_OFFSET. */
rtx
gen_rtx_REG_offset (rtx reg, enum machine_mode mode, unsigned int regno,
}
/* Generate a new pseudo-register with the same attributes as REG, but
- offsetted by OFFSET. */
+ with OFFSET added to the REG_OFFSET. */
rtx
gen_reg_rtx_offset (rtx reg, enum machine_mode mode, int offset)
return new;
}
-/* Set the decl for MEM to DECL. */
+/* Adjust REG in-place so that it has mode MODE. It is assumed that the
+ new register is a (possibly paradoxical) lowpart of the old one. */
void
-set_reg_attrs_from_mem (rtx reg, rtx mem)
+adjust_reg_mode (rtx reg, enum machine_mode mode)
{
- if (MEM_OFFSET (mem) && GET_CODE (MEM_OFFSET (mem)) == CONST_INT)
+ update_reg_offset (reg, reg, byte_lowpart_offset (mode, GET_MODE (reg)));
+ PUT_MODE (reg, mode);
+}
+
+/* Copy REG's attributes from X, if X has any attributes. If REG and X
+ have different modes, REG is a (possibly paradoxical) lowpart of X. */
+
+void
+set_reg_attrs_from_value (rtx reg, rtx x)
+{
+ int offset;
+
+ offset = byte_lowpart_offset (GET_MODE (reg), GET_MODE (x));
+ if (MEM_P (x) && MEM_OFFSET (x) && GET_CODE (MEM_OFFSET (x)) == CONST_INT)
REG_ATTRS (reg)
- = get_reg_attrs (MEM_EXPR (mem), INTVAL (MEM_OFFSET (mem)));
+ = get_reg_attrs (MEM_EXPR (x), INTVAL (MEM_OFFSET (x)) + offset);
+ if (REG_P (x) && REG_ATTRS (x))
+ update_reg_offset (reg, x, offset);
}
/* Set the register attributes for registers contained in PARM_RTX.
set_reg_attrs_for_parm (rtx parm_rtx, rtx mem)
{
if (REG_P (parm_rtx))
- set_reg_attrs_from_mem (parm_rtx, mem);
+ set_reg_attrs_from_value (parm_rtx, mem);
else if (GET_CODE (parm_rtx) == PARALLEL)
{
/* Check for a NULL entry in the first slot, used to indicate that the
}
}
-/* Assign the RTX X to declaration T. */
-void
-set_decl_rtl (tree t, rtx x)
-{
- DECL_WRTL_CHECK (t)->decl_with_rtl.rtl = x;
+/* Set the REG_ATTRS for registers in value X, given that X represents
+ decl T. */
- if (!x)
- return;
- /* For register, we maintain the reverse information too. */
- if (REG_P (x))
- REG_ATTRS (x) = get_reg_attrs (t, 0);
- else if (GET_CODE (x) == SUBREG)
- REG_ATTRS (SUBREG_REG (x))
- = get_reg_attrs (t, -SUBREG_BYTE (x));
- if (GET_CODE (x) == CONCAT)
+static void
+set_reg_attrs_for_decl_rtl (tree t, rtx x)
+{
+ if (GET_CODE (x) == SUBREG)
{
- if (REG_P (XEXP (x, 0)))
- REG_ATTRS (XEXP (x, 0)) = get_reg_attrs (t, 0);
- if (REG_P (XEXP (x, 1)))
- REG_ATTRS (XEXP (x, 1))
- = get_reg_attrs (t, GET_MODE_UNIT_SIZE (GET_MODE (XEXP (x, 0))));
+ gcc_assert (subreg_lowpart_p (x));
+ x = SUBREG_REG (x);
}
- if (GET_CODE (x) == PARALLEL)
- {
- int i;
- for (i = 0; i < XVECLEN (x, 0); i++)
- {
- rtx y = XVECEXP (x, 0, i);
- if (REG_P (XEXP (y, 0)))
- REG_ATTRS (XEXP (y, 0)) = get_reg_attrs (t, INTVAL (XEXP (y, 1)));
- }
- }
-}
-
-/* Assign the RTX X to parameter declaration T. */
-void
-set_decl_incoming_rtl (tree t, rtx x)
-{
- DECL_INCOMING_RTL (t) = x;
-
- if (!x)
- return;
- /* For register, we maintain the reverse information too. */
if (REG_P (x))
- REG_ATTRS (x) = get_reg_attrs (t, 0);
- else if (GET_CODE (x) == SUBREG)
- REG_ATTRS (SUBREG_REG (x))
- = get_reg_attrs (t, -SUBREG_BYTE (x));
+ REG_ATTRS (x)
+ = get_reg_attrs (t, byte_lowpart_offset (GET_MODE (x),
+ DECL_MODE (t)));
if (GET_CODE (x) == CONCAT)
{
if (REG_P (XEXP (x, 0)))
}
}
+/* Assign the RTX X to declaration T. */
+
+void
+set_decl_rtl (tree t, rtx x)
+{
+ DECL_WRTL_CHECK (t)->decl_with_rtl.rtl = x;
+ if (x)
+ set_reg_attrs_for_decl_rtl (t, x);
+}
+
+/* Assign the RTX X to parameter declaration T. BY_REFERENCE_P is true
+ if the ABI requires the parameter to be passed by reference. */
+
+void
+set_decl_incoming_rtl (tree t, rtx x, bool by_reference_p)
+{
+ DECL_INCOMING_RTL (t) = x;
+ if (x && !by_reference_p)
+ set_reg_attrs_for_decl_rtl (t, x);
+}
+
/* Identify REG (which may be a CONCAT) as a user register. */
void
subreg_highpart_offset (outermode, innermode));
}
-/* Return offset in bytes to get OUTERMODE low part
- of the value in mode INNERMODE stored in memory in target format. */
+/* Return the SUBREG_BYTE for an OUTERMODE lowpart of an INNERMODE value. */
unsigned int
subreg_lowpart_offset (enum machine_mode outermode, enum machine_mode innermode)
set_mem_attributes_minus_bitpos (ref, t, objectp, 0);
}
-/* Set the decl for MEM to DECL. */
+/* Set MEM to the decl that REG refers to. */
void
set_mem_attrs_from_reg (rtx mem, rtx reg)
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- TODO_dump_func, /* todo_flags_finish */
+ TODO_dump_func | TODO_verify_rtl_sharing, /* todo_flags_finish */
0 /* letter */
};
set_used_flags (DECL_RTL (t));
/* Now process sub-blocks. */
- for (t = BLOCK_SUBBLOCKS (blk); t; t = TREE_CHAIN (t))
+ for (t = BLOCK_SUBBLOCKS (blk); t; t = BLOCK_CHAIN (t))
set_used_decls (t);
}
rtx before = PREV_INSN (trial);
rtx after = NEXT_INSN (trial);
int has_barrier = 0;
- rtx tem, note_retval;
+ rtx tem, note_retval, note_libcall;
rtx note, seq;
int probability;
rtx insn_last, insn;
XEXP (note_retval, 0) = insn_last;
break;
+ case REG_RETVAL:
+ /* Relink the insns with REG_LIBCALL note and with REG_RETVAL note
+ after split. */
+ REG_NOTES (insn_last)
+ = gen_rtx_INSN_LIST (REG_RETVAL,
+ XEXP (note, 0),
+ REG_NOTES (insn_last));
+
+ note_libcall = find_reg_note (XEXP (note, 0), REG_LIBCALL, NULL);
+ XEXP (note_libcall, 0) = insn_last;
+ break;
+
default:
break;
}
/* If there are LABELS inside the split insns increment the
usage count so we don't delete the label. */
- if (NONJUMP_INSN_P (trial))
+ if (INSN_P (trial))
{
insn = insn_last;
while (insn != NULL_RTX)
{
+ /* JUMP_P insns have already been "marked" above. */
if (NONJUMP_INSN_P (insn))
mark_label_nuses (PATTERN (insn));
for (x = from; x != NEXT_INSN (to); x = NEXT_INSN (x))
if (!BARRIER_P (x))
- {
- set_block_for_insn (x, bb);
- df_insn_change_bb (x);
- }
+ df_insn_change_bb (x, bb);
}
}
void
force_next_line_note (void)
{
-#ifdef USE_MAPPED_LOCATION
last_location = -1;
-#else
- last_location.line = -1;
-#endif
}
/* Place a note of KIND on insn INSN with DATUM as the datum. If a
return gen_rtx_raw_CONST_VECTOR (mode, v);
}
+/* Initialise global register information required by all functions. */
+
+void
+init_emit_regs (void)
+{
+ int i;
+
+ /* Reset register attributes */
+ htab_empty (reg_attrs_htab);
+
+ /* We need reg_raw_mode, so initialize the modes now. */
+ init_reg_modes_target ();
+
+ /* Assign register numbers to the globally defined register rtx. */
+ pc_rtx = gen_rtx_PC (VOIDmode);
+ cc0_rtx = gen_rtx_CC0 (VOIDmode);
+ stack_pointer_rtx = gen_raw_REG (Pmode, STACK_POINTER_REGNUM);
+ frame_pointer_rtx = gen_raw_REG (Pmode, FRAME_POINTER_REGNUM);
+ hard_frame_pointer_rtx = gen_raw_REG (Pmode, HARD_FRAME_POINTER_REGNUM);
+ arg_pointer_rtx = gen_raw_REG (Pmode, ARG_POINTER_REGNUM);
+ virtual_incoming_args_rtx =
+ gen_raw_REG (Pmode, VIRTUAL_INCOMING_ARGS_REGNUM);
+ virtual_stack_vars_rtx =
+ gen_raw_REG (Pmode, VIRTUAL_STACK_VARS_REGNUM);
+ virtual_stack_dynamic_rtx =
+ gen_raw_REG (Pmode, VIRTUAL_STACK_DYNAMIC_REGNUM);
+ virtual_outgoing_args_rtx =
+ gen_raw_REG (Pmode, VIRTUAL_OUTGOING_ARGS_REGNUM);
+ virtual_cfa_rtx = gen_raw_REG (Pmode, VIRTUAL_CFA_REGNUM);
+
+ /* Initialize RTL for commonly used hard registers. These are
+ copied into regno_reg_rtx as we begin to compile each function. */
+ for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
+ static_regno_reg_rtx[i] = gen_raw_REG (reg_raw_mode[i], i);
+
+#ifdef RETURN_ADDRESS_POINTER_REGNUM
+ return_address_pointer_rtx
+ = gen_raw_REG (Pmode, RETURN_ADDRESS_POINTER_REGNUM);
+#endif
+
+#ifdef STATIC_CHAIN_REGNUM
+ static_chain_rtx = gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
+
+#ifdef STATIC_CHAIN_INCOMING_REGNUM
+ if (STATIC_CHAIN_INCOMING_REGNUM != STATIC_CHAIN_REGNUM)
+ static_chain_incoming_rtx
+ = gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
+ else
+#endif
+ static_chain_incoming_rtx = static_chain_rtx;
+#endif
+
+#ifdef STATIC_CHAIN
+ static_chain_rtx = STATIC_CHAIN;
+
+#ifdef STATIC_CHAIN_INCOMING
+ static_chain_incoming_rtx = STATIC_CHAIN_INCOMING;
+#else
+ static_chain_incoming_rtx = static_chain_rtx;
+#endif
+#endif
+
+ if ((unsigned) PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM)
+ pic_offset_table_rtx = gen_raw_REG (Pmode, PIC_OFFSET_TABLE_REGNUM);
+ else
+ pic_offset_table_rtx = NULL_RTX;
+}
+
/* Create some permanent unique rtl objects shared between all functions.
LINE_NUMBERS is nonzero if line numbers are to be generated. */
enum machine_mode mode;
enum machine_mode double_mode;
- /* We need reg_raw_mode, so initialize the modes now. */
- init_reg_modes_once ();
-
/* Initialize the CONST_INT, CONST_DOUBLE, CONST_FIXED, and memory attribute
hash tables. */
const_int_htab = htab_create_ggc (37, const_int_htab_hash,
ptr_mode = mode_for_size (POINTER_SIZE, GET_MODE_CLASS (Pmode), 0);
- /* Assign register numbers to the globally defined register rtx.
- This must be done at runtime because the register number field
- is in a union and some compilers can't initialize unions. */
-
- pc_rtx = gen_rtx_PC (VOIDmode);
- cc0_rtx = gen_rtx_CC0 (VOIDmode);
- stack_pointer_rtx = gen_raw_REG (Pmode, STACK_POINTER_REGNUM);
- frame_pointer_rtx = gen_raw_REG (Pmode, FRAME_POINTER_REGNUM);
- if (hard_frame_pointer_rtx == 0)
- hard_frame_pointer_rtx = gen_raw_REG (Pmode,
- HARD_FRAME_POINTER_REGNUM);
- if (arg_pointer_rtx == 0)
- arg_pointer_rtx = gen_raw_REG (Pmode, ARG_POINTER_REGNUM);
- virtual_incoming_args_rtx =
- gen_raw_REG (Pmode, VIRTUAL_INCOMING_ARGS_REGNUM);
- virtual_stack_vars_rtx =
- gen_raw_REG (Pmode, VIRTUAL_STACK_VARS_REGNUM);
- virtual_stack_dynamic_rtx =
- gen_raw_REG (Pmode, VIRTUAL_STACK_DYNAMIC_REGNUM);
- virtual_outgoing_args_rtx =
- gen_raw_REG (Pmode, VIRTUAL_OUTGOING_ARGS_REGNUM);
- virtual_cfa_rtx = gen_raw_REG (Pmode, VIRTUAL_CFA_REGNUM);
-
- /* Initialize RTL for commonly used hard registers. These are
- copied into regno_reg_rtx as we begin to compile each function. */
- for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
- static_regno_reg_rtx[i] = gen_raw_REG (reg_raw_mode[i], i);
-
#ifdef INIT_EXPANDERS
/* This is to initialize {init|mark|free}_machine_status before the first
call to push_function_context_to. This is needed by the Chill front
const_tiny_rtx[0][(int) BImode] = const0_rtx;
if (STORE_FLAG_VALUE == 1)
const_tiny_rtx[1][(int) BImode] = const1_rtx;
-
-#ifdef RETURN_ADDRESS_POINTER_REGNUM
- return_address_pointer_rtx
- = gen_raw_REG (Pmode, RETURN_ADDRESS_POINTER_REGNUM);
-#endif
-
-#ifdef STATIC_CHAIN_REGNUM
- static_chain_rtx = gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
-
-#ifdef STATIC_CHAIN_INCOMING_REGNUM
- if (STATIC_CHAIN_INCOMING_REGNUM != STATIC_CHAIN_REGNUM)
- static_chain_incoming_rtx
- = gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
- else
-#endif
- static_chain_incoming_rtx = static_chain_rtx;
-#endif
-
-#ifdef STATIC_CHAIN
- static_chain_rtx = STATIC_CHAIN;
-
-#ifdef STATIC_CHAIN_INCOMING
- static_chain_incoming_rtx = STATIC_CHAIN_INCOMING;
-#else
- static_chain_incoming_rtx = static_chain_rtx;
-#endif
-#endif
-
- if ((unsigned) PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM)
- pic_offset_table_rtx = gen_raw_REG (Pmode, PIC_OFFSET_TABLE_REGNUM);
}
\f
/* Produce exact duplicate of insn INSN after AFTER.
which may be duplicated by the basic block reordering code. */
RTX_FRAME_RELATED_P (new) = RTX_FRAME_RELATED_P (insn);
- /* Copy all REG_NOTES except REG_LABEL since mark_jump_label will
- make them. */
+ /* Copy all REG_NOTES except REG_LABEL_OPERAND since mark_jump_label
+ will make them. REG_LABEL_TARGETs are created there too, but are
+ supposed to be sticky, so we copy them. */
for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
- if (REG_NOTE_KIND (link) != REG_LABEL)
+ if (REG_NOTE_KIND (link) != REG_LABEL_OPERAND)
{
if (GET_CODE (link) == EXPR_LIST)
REG_NOTES (new)
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