--- Comment #7 from aoliva at gcc dot gnu dot org 2010-06-11 11:45 ---
Not a bug
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aoliva at gcc dot gnu dot org changed:
What|Removed |Added
--- Comment #6 from aoliva at gcc dot gnu dot org 2010-06-02 06:28 ---
Andrew, the debug stmts are indeed originally from the loop header's PHI nodes.
Before ch we have:
i_1 = init;
# i = i_1
goto header;
body:
i_3 = whatever(i_2);
# i = i_3
header:
i_2 = PHI i_1, i_3;
# i = i_2
if
--- Comment #5 from jakub at gcc dot gnu dot org 2010-03-02 11:12 ---
The extra DEBUG stmts or DEBUG_INSNs only consume memory, they shouldn't affect
debug info generation, though perhaps it wouldn't hurt once or twice during
gimple optimizations and once or twice during RTL
--- Comment #1 from pinskia at gcc dot gnu dot org 2010-03-01 23:05 ---
And there are actually two duplicated debug statements. One for the i = 0 and
then one for i = i_11
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43222
--- Comment #2 from pinskia at gcc dot gnu dot org 2010-03-01 23:14 ---
Here is a simplier testcase which shows the problem is even worse:
int gif_read_lzw(int input_code_size)
{
int i;
short code_size = 0;
for (i = 0; i input_code_size; i ++)
code_size ++;
return
--- Comment #3 from pinskia at gcc dot gnu dot org 2010-03-01 23:20 ---
And nothing removes the duplicated debug statements that are outside the loop
until rtl dce comes around. And it removes the debug statements which had line
information too.
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--- Comment #4 from jakub at gcc dot gnu dot org 2010-03-02 07:54 ---
Line info on debug stmts/DEBUG_INSNs is ignored.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43222
