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dwarf2out.c (mem_loc_descriptor): Use DW_OP_deref_size if MEM's mode size isn't DWARF2_ADDR_SIZE.

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* dwarf2out.c (mem_loc_descriptor) <case MEM>: Use DW_OP_deref_size
	if MEM's mode size isn't DWARF2_ADDR_SIZE.
	(mem_loc_descriptor) <do_scompare>: Allow also VOIDmode arguments.
	Optimize eq/ne comparisons when both arguments are known to be
	zero-extended.
	(mem_loc_descriptor) <do_ucompare>: Allow also VOIDmode arguments.
	Don't mask operands unnecessarily if they are known to be already
	zero-extended.

From-SVN: r156692
This commit is contained in:
Jakub Jelinek 2010-02-11 10:16:38 +01:00 committed by Jakub Jelinek
parent 19030d779a
commit d2d36740c2
2 changed files with 149 additions and 56 deletions
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11
gcc/ChangeLog
View File

@ -1,3 +1,14 @@
2010-02-11 Jakub Jelinek <jakub@redhat.com>
* dwarf2out.c (mem_loc_descriptor) <case MEM>: Use DW_OP_deref_size
if MEM's mode size isn't DWARF2_ADDR_SIZE.
(mem_loc_descriptor) <do_scompare>: Allow also VOIDmode arguments.
Optimize eq/ne comparisons when both arguments are known to be
zero-extended.
(mem_loc_descriptor) <do_ucompare>: Allow also VOIDmode arguments.
Don't mask operands unnecessarily if they are known to be already
zero-extended.
2010-02-10 Vladimir Makarov <vmakarov@redhat.com>
* ira-conflicts.c (add_insn_allocno_copies): Use find_reg_note

194
gcc/dwarf2out.c
View File

@ -12990,7 +12990,19 @@ mem_loc_descriptor (rtx rtl, enum machine_mode mode,
if (mem_loc_result == NULL)
mem_loc_result = tls_mem_loc_descriptor (rtl);
if (mem_loc_result != 0)
add_loc_descr (&mem_loc_result, new_loc_descr (DW_OP_deref, 0, 0));
{
if (GET_MODE_SIZE (GET_MODE (rtl)) > DWARF2_ADDR_SIZE)
{
expansion_failed (NULL_TREE, rtl, "DWARF address size mismatch");
return 0;
}
else if (GET_MODE_SIZE (GET_MODE (rtl)) == DWARF2_ADDR_SIZE)
add_loc_descr (&mem_loc_result, new_loc_descr (DW_OP_deref, 0, 0));
else
add_loc_descr (&mem_loc_result,
new_loc_descr (DW_OP_deref_size,
GET_MODE_SIZE (GET_MODE (rtl)), 0));
}
else
{
rtx new_rtl = avoid_constant_pool_reference (rtl);
@ -13219,32 +13231,72 @@ mem_loc_descriptor (rtx rtl, enum machine_mode mode,
goto do_scompare;
do_scompare:
if (GET_MODE_CLASS (GET_MODE (XEXP (rtl, 0))) != MODE_INT
|| GET_MODE_SIZE (GET_MODE (XEXP (rtl, 0))) > DWARF2_ADDR_SIZE
|| GET_MODE (XEXP (rtl, 0)) != GET_MODE (XEXP (rtl, 1)))
if (GET_MODE_SIZE (GET_MODE (XEXP (rtl, 0))) > DWARF2_ADDR_SIZE
|| GET_MODE_SIZE (GET_MODE (XEXP (rtl, 1))) > DWARF2_ADDR_SIZE)
break;
op0 = mem_loc_descriptor (XEXP (rtl, 0), mode,
VAR_INIT_STATUS_INITIALIZED);
op1 = mem_loc_descriptor (XEXP (rtl, 1), mode,
VAR_INIT_STATUS_INITIALIZED);
if (op0 == 0 || op1 == 0)
break;
if (GET_MODE_SIZE (GET_MODE (XEXP (rtl, 0))) < DWARF2_ADDR_SIZE)
else
{
int shift = DWARF2_ADDR_SIZE
- GET_MODE_SIZE (GET_MODE (XEXP (rtl, 0)));
shift *= BITS_PER_UNIT;
add_loc_descr (&op0, int_loc_descriptor (shift));
add_loc_descr (&op0, new_loc_descr (DW_OP_shl, 0, 0));
if (CONST_INT_P (XEXP (rtl, 1)))
op1 = int_loc_descriptor (INTVAL (XEXP (rtl, 1)) << shift);
else
enum machine_mode op_mode = GET_MODE (XEXP (rtl, 0));
if (op_mode == VOIDmode)
op_mode = GET_MODE (XEXP (rtl, 1));
if (op_mode != VOIDmode && GET_MODE_CLASS (op_mode) != MODE_INT)
break;
op0 = mem_loc_descriptor (XEXP (rtl, 0), mode,
VAR_INIT_STATUS_INITIALIZED);
op1 = mem_loc_descriptor (XEXP (rtl, 1), mode,
VAR_INIT_STATUS_INITIALIZED);
if (op0 == 0 || op1 == 0)
break;
if (op_mode != VOIDmode
&& GET_MODE_SIZE (op_mode) < DWARF2_ADDR_SIZE)
{
add_loc_descr (&op1, int_loc_descriptor (shift));
add_loc_descr (&op1, new_loc_descr (DW_OP_shl, 0, 0));
int shift = DWARF2_ADDR_SIZE - GET_MODE_SIZE (op_mode);
shift *= BITS_PER_UNIT;
/* For eq/ne, if the operands are known to be zero-extended,
there is no need to do the fancy shifting up. */
if (op == DW_OP_eq || op == DW_OP_ne)
{
dw_loc_descr_ref last0, last1;
for (last0 = op0;
last0->dw_loc_next != NULL;
last0 = last0->dw_loc_next)
;
for (last1 = op1;
last1->dw_loc_next != NULL;
last1 = last1->dw_loc_next)
;
/* deref_size zero extends, and for constants we can check
whether they are zero extended or not. */
if (((last0->dw_loc_opc == DW_OP_deref_size
&& last0->dw_loc_oprnd1.v.val_int
<= GET_MODE_SIZE (op_mode))
|| (CONST_INT_P (XEXP (rtl, 0))
&& (unsigned HOST_WIDE_INT) INTVAL (XEXP (rtl, 0))
== (INTVAL (XEXP (rtl, 0))
& GET_MODE_MASK (op_mode))))
&& ((last1->dw_loc_opc == DW_OP_deref_size
&& last1->dw_loc_oprnd1.v.val_int
<= GET_MODE_SIZE (op_mode))
|| (CONST_INT_P (XEXP (rtl, 1))
&& (unsigned HOST_WIDE_INT)
INTVAL (XEXP (rtl, 1))
== (INTVAL (XEXP (rtl, 1))
& GET_MODE_MASK (op_mode)))))
goto do_compare;
}
add_loc_descr (&op0, int_loc_descriptor (shift));
add_loc_descr (&op0, new_loc_descr (DW_OP_shl, 0, 0));
if (CONST_INT_P (XEXP (rtl, 1)))
op1 = int_loc_descriptor (INTVAL (XEXP (rtl, 1)) << shift);
else
{
add_loc_descr (&op1, int_loc_descriptor (shift));
add_loc_descr (&op1, new_loc_descr (DW_OP_shl, 0, 0));
}
}
}
@ -13277,42 +13329,72 @@ mem_loc_descriptor (rtx rtl, enum machine_mode mode,
goto do_ucompare;
do_ucompare:
if (GET_MODE_CLASS (GET_MODE (XEXP (rtl, 0))) != MODE_INT
|| GET_MODE_SIZE (GET_MODE (XEXP (rtl, 0))) > DWARF2_ADDR_SIZE
|| GET_MODE (XEXP (rtl, 0)) != GET_MODE (XEXP (rtl, 1)))
if (GET_MODE_SIZE (GET_MODE (XEXP (rtl, 0))) > DWARF2_ADDR_SIZE
|| GET_MODE_SIZE (GET_MODE (XEXP (rtl, 1))) > DWARF2_ADDR_SIZE)
break;
op0 = mem_loc_descriptor (XEXP (rtl, 0), mode,
VAR_INIT_STATUS_INITIALIZED);
op1 = mem_loc_descriptor (XEXP (rtl, 1), mode,
VAR_INIT_STATUS_INITIALIZED);
if (op0 == 0 || op1 == 0)
break;
if (GET_MODE_SIZE (GET_MODE (XEXP (rtl, 0))) < DWARF2_ADDR_SIZE)
{
HOST_WIDE_INT mask = GET_MODE_MASK (GET_MODE (XEXP (rtl, 0)));
add_loc_descr (&op0, int_loc_descriptor (mask));
add_loc_descr (&op0, new_loc_descr (DW_OP_and, 0, 0));
if (CONST_INT_P (XEXP (rtl, 1)))
op1 = int_loc_descriptor (INTVAL (XEXP (rtl, 1)) & mask);
else
{
add_loc_descr (&op1, int_loc_descriptor (mask));
add_loc_descr (&op1, new_loc_descr (DW_OP_and, 0, 0));
}
}
else
{
HOST_WIDE_INT bias = 1;
bias <<= (DWARF2_ADDR_SIZE * BITS_PER_UNIT - 1);
add_loc_descr (&op0, new_loc_descr (DW_OP_plus_uconst, bias, 0));
if (CONST_INT_P (XEXP (rtl, 1)))
op1 = int_loc_descriptor ((unsigned HOST_WIDE_INT) bias
+ INTVAL (XEXP (rtl, 1)));
enum machine_mode op_mode = GET_MODE (XEXP (rtl, 0));
if (op_mode == VOIDmode)
op_mode = GET_MODE (XEXP (rtl, 1));
if (op_mode != VOIDmode && GET_MODE_CLASS (op_mode) != MODE_INT)
break;
op0 = mem_loc_descriptor (XEXP (rtl, 0), mode,
VAR_INIT_STATUS_INITIALIZED);
op1 = mem_loc_descriptor (XEXP (rtl, 1), mode,
VAR_INIT_STATUS_INITIALIZED);
if (op0 == 0 || op1 == 0)
break;
if (op_mode != VOIDmode
&& GET_MODE_SIZE (op_mode) < DWARF2_ADDR_SIZE)
{
HOST_WIDE_INT mask = GET_MODE_MASK (op_mode);
dw_loc_descr_ref last0, last1;
for (last0 = op0;
last0->dw_loc_next != NULL;
last0 = last0->dw_loc_next)
;
for (last1 = op1;
last1->dw_loc_next != NULL;
last1 = last1->dw_loc_next)
;
if (CONST_INT_P (XEXP (rtl, 0)))
op0 = int_loc_descriptor (INTVAL (XEXP (rtl, 0)) & mask);
/* deref_size zero extends, so no need to mask it again. */
else if (last0->dw_loc_opc != DW_OP_deref_size
|| last0->dw_loc_oprnd1.v.val_int
> GET_MODE_SIZE (op_mode))
{
add_loc_descr (&op0, int_loc_descriptor (mask));
add_loc_descr (&op0, new_loc_descr (DW_OP_and, 0, 0));
}
if (CONST_INT_P (XEXP (rtl, 1)))
op1 = int_loc_descriptor (INTVAL (XEXP (rtl, 1)) & mask);
/* deref_size zero extends, so no need to mask it again. */
else if (last1->dw_loc_opc != DW_OP_deref_size
|| last1->dw_loc_oprnd1.v.val_int
> GET_MODE_SIZE (op_mode))
{
add_loc_descr (&op1, int_loc_descriptor (mask));
add_loc_descr (&op1, new_loc_descr (DW_OP_and, 0, 0));
}
}
else
add_loc_descr (&op1, new_loc_descr (DW_OP_plus_uconst, bias, 0));
{
HOST_WIDE_INT bias = 1;
bias <<= (DWARF2_ADDR_SIZE * BITS_PER_UNIT - 1);
add_loc_descr (&op0, new_loc_descr (DW_OP_plus_uconst, bias, 0));
if (CONST_INT_P (XEXP (rtl, 1)))
op1 = int_loc_descriptor ((unsigned HOST_WIDE_INT) bias
+ INTVAL (XEXP (rtl, 1)));
else
add_loc_descr (&op1, new_loc_descr (DW_OP_plus_uconst,
bias, 0));
}
}
goto do_compare;