http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21182
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |vmakarov at gcc dot gnu.org
Target Milestone|--- |4.6.4
Summary|gcc can use registers but |[4.6/4.7/4.8 Regression]
|uses stack instead |gcc can use registers but
| |uses stack instead
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> 2013-01-18
10:38:54 UTC ---
4.4.7 and 4.5.4 generate the same code (no stack use) for -D/-UNAIL_REGS.
With 4.6.3, the -DNAIL_REGS code regresses very much (IRA ...), the
-UNAIL_REGS code is nearly perfect but less good than 4.4/4.5 (if you
only consider grep esp serpent.s | wc -l). Same behavior with 4.7.2.
Trunk got somewhat worse with -UNAIL_REGS but better with -DNAIL_REGS (at -O2):
-UNAIL_REGS -DNAIL_REGS
4.5.4 3 3
4.6.3 15 101
4.7.2 15 93
4.8.0 23 70
The most important thing to fix is the -UNAIL_REGS case of course.
A regression for that from 4.4/4.5.
