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re PR debug/49676 (inefficiency: DW_AT_GNU_call_site_value calculates everything << 32) 

PR debug/49676
	* dwarf2out.c (size_of_int_loc_descriptor): New function.
	(address_of_int_loc_descriptor): Use it.
	(scompare_loc_descriptor): Optimize EQ/NE comparison with
	constant.

From-SVN: r176083
This commit is contained in:
Jakub Jelinek 2011-07-09 17:48:42 +02:00 committed by Jakub Jelinek
parent 8662b2ba92
commit 5b696ba2dc
2 changed files with 65 additions and 26 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2011-07-09 Jakub Jelinek <jakub@redhat.com>
PR debug/49676
* dwarf2out.c (size_of_int_loc_descriptor): New function.
(address_of_int_loc_descriptor): Use it.
(scompare_loc_descriptor): Optimize EQ/NE comparison with
constant.
2011-07-09 Richard Henderson <rth@redhat.com>
* config/pdp11/pdp11.md (define_c_enum "unspecv"): New.

83
gcc/dwarf2out.c
View File

@ -10848,6 +10848,40 @@ int_loc_descriptor (HOST_WIDE_INT i)
return new_loc_descr (op, i, 0);
}
/* Return size_of_locs (int_loc_descriptor (i)) without
actually allocating it. */
static unsigned long
size_of_int_loc_descriptor (HOST_WIDE_INT i)
{
if (i >= 0)
{
if (i <= 31)
return 1;
else if (i <= 0xff)
return 2;
else if (i <= 0xffff)
return 3;
else if (HOST_BITS_PER_WIDE_INT == 32
|| i <= 0xffffffff)
return 5;
else
return 1 + size_of_uleb128 ((unsigned HOST_WIDE_INT) i);
}
else
{
if (i >= -0x80)
return 2;
else if (i >= -0x8000)
return 3;
else if (HOST_BITS_PER_WIDE_INT == 32
|| i >= -0x80000000)
return 5;
else
return 1 + size_of_sleb128 (i);
}
}
/* Return loc description representing "address" of integer value.
This can appear only as toplevel expression. */
@ -10860,32 +10894,7 @@ address_of_int_loc_descriptor (int size, HOST_WIDE_INT i)
if (!(dwarf_version >= 4 || !dwarf_strict))
return NULL;
if (i >= 0)
{
if (i <= 31)
litsize = 1;
else if (i <= 0xff)
litsize = 2;
else if (i <= 0xffff)
litsize = 3;
else if (HOST_BITS_PER_WIDE_INT == 32
|| i <= 0xffffffff)
litsize = 5;
else
litsize = 1 + size_of_uleb128 ((unsigned HOST_WIDE_INT) i);
}
else
{
if (i >= -0x80)
litsize = 2;
else if (i >= -0x8000)
litsize = 3;
else if (HOST_BITS_PER_WIDE_INT == 32
|| i >= -0x80000000)
litsize = 5;
else
litsize = 1 + size_of_sleb128 (i);
}
litsize = size_of_int_loc_descriptor (i);
/* Determine if DW_OP_stack_value or DW_OP_implicit_value
is more compact. For DW_OP_stack_value we need:
litsize + 1 (DW_OP_stack_value)
@ -11284,6 +11293,28 @@ scompare_loc_descriptor (enum dwarf_location_atom op, rtx rtl,
&& (unsigned HOST_WIDE_INT) INTVAL (XEXP (rtl, 1))
== (INTVAL (XEXP (rtl, 1)) & GET_MODE_MASK (op_mode)))))
return compare_loc_descriptor (op, op0, op1);
/* EQ/NE comparison against constant in narrower type than
DWARF2_ADDR_SIZE can be performed either as
DW_OP_const1u <shift> DW_OP_shl DW_OP_const* <cst << shift>
DW_OP_{eq,ne}
or
DW_OP_const*u <mode_mask> DW_OP_and DW_OP_const* <cst & mode_mask>
DW_OP_{eq,ne}. Pick whatever is shorter. */
if (CONST_INT_P (XEXP (rtl, 1))
&& GET_MODE_BITSIZE (op_mode) < HOST_BITS_PER_WIDE_INT
&& (size_of_int_loc_descriptor (shift) + 1
+ size_of_int_loc_descriptor (INTVAL (XEXP (rtl, 1)) << shift)
>= size_of_int_loc_descriptor (GET_MODE_MASK (op_mode)) + 1
+ size_of_int_loc_descriptor (INTVAL (XEXP (rtl, 1))
& GET_MODE_MASK (op_mode))))
{
add_loc_descr (&op0, int_loc_descriptor (GET_MODE_MASK (op_mode)));
add_loc_descr (&op0, new_loc_descr (DW_OP_and, 0, 0));
op1 = int_loc_descriptor (INTVAL (XEXP (rtl, 1))
& GET_MODE_MASK (op_mode));
return compare_loc_descriptor (op, op0, op1);
}
}
add_loc_descr (&op0, int_loc_descriptor (shift));
add_loc_descr (&op0, new_loc_descr (DW_OP_shl, 0, 0));