OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Handle many consecutive location notes more efficiently in dwarf2.

Browse Source 
* dwarf2out.c (dwarf2out_var_location): When processing several
	consecutive location notes, cache the result of next_real_insn().

From-SVN: r180695
This commit is contained in:
David S. Miller 2011-10-31 01:48:15 +00:00 committed by David S. Miller
parent 9ceb54d132
commit ea2fa34166
2 changed files with 37 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2011-10-30 David S. Miller <davem@davemloft.net>
* dwarf2out.c (dwarf2out_var_location): When processing several
consecutive location notes, cache the result of next_real_insn().
2011-10-30 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.md (avx2_vec_dup<mode>): Macroize insn from

34
gcc/dwarf2out.c
View File

@ -20127,10 +20127,12 @@ dwarf2out_var_location (rtx loc_note)
{
char loclabel[MAX_ARTIFICIAL_LABEL_BYTES + 2];
struct var_loc_node *newloc;
rtx next_real;
rtx next_real, next_note;
static const char *last_label;
static const char *last_postcall_label;
static bool last_in_cold_section_p;
static rtx expected_next_loc_note;
static rtx cached_next_real_insn;
tree decl;
bool var_loc_p;
@ -20149,7 +20151,35 @@ dwarf2out_var_location (rtx loc_note)
if (var_loc_p && !DECL_P (NOTE_VAR_LOCATION_DECL (loc_note)))
return;
next_real = next_real_insn (loc_note);
/* Optimize processing a large consecutive sequence of location
notes so we don't spend too much time in next_real_insn. If the
next insn is another location note, remember the next_real_insn
calculation for next time. */
next_real = cached_next_real_insn;
if (next_real)
{
if (expected_next_loc_note != loc_note)
next_real = NULL_RTX;
}
next_note = NEXT_INSN (loc_note);
if (! next_note
|| INSN_DELETED_P (next_note)
|| GET_CODE (next_note) != NOTE
|| (NOTE_KIND (next_note) != NOTE_INSN_VAR_LOCATION
&& NOTE_KIND (next_note) != NOTE_INSN_CALL_ARG_LOCATION))
next_note = NULL_RTX;
if (! next_real)
next_real = next_real_insn (loc_note);
if (next_note)
{
expected_next_loc_note = next_note;
cached_next_real_insn = next_real;
}
else
cached_next_real_insn = NULL_RTX;
/* If there are no instructions which would be affected by this note,
don't do anything. */