https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63660
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2014-10-28
Component|driver |tree-optimization
Summary|[4.8-4.9+] |-Wmaybe-uninitialized false
|-Wmaybe-uninitialized false |positive with -O1 and more
|positive with -O1 and more |
Ever confirmed|0 |1
Known to fail| |4.8.3, 4.9.2, 5.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think you hit one of the limits to avoid excessive compile-time for the
uninit analysis:
#define MAX_NUM_CHAINS 8
#define MAX_CHAIN_LEN 5
#define MAX_POSTDOM_CHECK 8
I suppose it's the MAX_POSTDOM_CHECK value. Sadly those are not parameters
controllable by any --param.
There is --param uninit-control-dep-attempts though (but its default is 1000
which the testcase probably doesn't hit).
Confirmed with 4.8, 4.9 and 5.
