Re: [PATCH] Handle many consecutive location notes more efficiently in dwarf2.

[David Miller]

From: Jakub Jelinek <ja...@redhat.com>
Date: Mon, 31 Oct 2011 11:26:40 +0100

> Or alternatively you could remove the whole if (! !next_note ...)
> next_note = NULL_RTX; stmt and move your cache to a global var and
> clear it when reaching end of function (like
> e.g. last_var_location_insn is cleared in dwarf2out_end_epilogue).

This solution sounds the best, thanks Jakub!

If I get some time I'll see if I can more strongly integrate my changes
with the existing last_label sharing code there, as all of these tests
are checking for essentially the same thing.

--------------------
Invalidate cached next real insn in dwarf2out_end_epilogue().

        * dwarf2out.c (cached_next_real_insn): New.
        (dwarf2out_end_epilogue): Set it to NULL_RTX.
        (dwarf2out_var_location): Remove cached_next_real_insn local static.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@180713 
138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/ChangeLog   |    6 ++++++
 gcc/dwarf2out.c |    3 ++-
 2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index caed12e..4848147 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2011-10-31  David S. Miller  <da...@davemloft.net>
+
+       * dwarf2out.c (cached_next_real_insn): New.
+       (dwarf2out_end_epilogue): Set it to NULL_RTX.
+       (dwarf2out_var_location): Remove cached_next_real_insn local static.
+
 2011-10-31  Richard Henderson  <r...@redhat.com>
 
        * config/i386/sse.md (floatv8siv8sf2): Rename from avx_cvtdq2ps256.
diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index 478952f..e6f86a4 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -98,6 +98,7 @@ along with GCC; see the file COPYING3.  If not see
 
 static void dwarf2out_source_line (unsigned int, const char *, int, bool);
 static rtx last_var_location_insn;
+static rtx cached_next_real_insn;
 
 #ifdef VMS_DEBUGGING_INFO
 int vms_file_stats_name (const char *, long long *, long *, char *, int *);
@@ -1090,6 +1091,7 @@ dwarf2out_end_epilogue (unsigned int line 
ATTRIBUTE_UNUSED,
   char label[MAX_ARTIFICIAL_LABEL_BYTES];
 
   last_var_location_insn = NULL_RTX;
+  cached_next_real_insn = NULL_RTX;
 
   if (dwarf2out_do_cfi_asm ())
     fprintf (asm_out_file, "\t.cfi_endproc\n");
@@ -20132,7 +20134,6 @@ dwarf2out_var_location (rtx loc_note)
   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;
 
-- 
1.7.6.401.g6a319