--- Comment #6 from steven at gcc dot gnu dot org 2009-06-22 16:25 ---
Since this is inherently a heuristics issue, and the IRA heuristics result in
overall better code size according to Vlad, I would like to propose we close
this PR as WONTFIX. Would anyone object to that?
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ramana at gcc dot gnu dot org changed:
What|Removed |Added
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last
--- Comment #5 from alexvod at google dot com 2009-04-27 09:06 ---
Vladimir, many thanks for your analysis! I will try to do analysis myself and
make comparison on larger real-word examples next time. Lowering severity for
now.
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alexvod at google dot com changed:
What
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jakub at gcc dot gnu dot org changed:
What|Removed |Added
Priority|P3 |P4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39836
--- Comment #4 from vmakarov at redhat dot com 2009-04-26 17:38 ---
The first test case is just an example that RA is a heuristic
solution. Even heuristic algorithm which works worse in average
sometimes can generate a better solution than ones working better in
average.
Here is IRA
--- Comment #3 from alexvod at google dot com 2009-04-23 16:49 ---
Another example of sub-optimal register allocation on ARM/thumb with IRA (not
sure if this the same bug or a different one).
int func(char*);
void func2(const char*, int);
void test(char **pSignature)
{
int clazz =
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pinskia at gcc dot gnu dot org changed:
What|Removed |Added
Component|regression |rtl-optimization
Keywords|
--- Comment #1 from alexvod at google dot com 2009-04-21 16:08 ---
Compilation options: -march=armv5te -fpic -mthumb-interwork -Os -mthumb
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39836
--- Comment #2 from pinskia at gcc dot gnu dot org 2009-04-21 17:07 ---
So it is using stack space instead of r3 for something that is alive across the
function call.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39836
