https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80548
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-04-28
Ever confirmed|0 |1
Known to fail| |4.8.5, 5.4.1, 6.3.1, 7.0.1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed (also with -O2). Older compilers need -Wuninitialized to trigger it.
[WORKLIST]: add to initial list: x_22 = PHI <x_6(D)(11), x_10(3)>
[WORKLIST]: add to initial list: y_21 = PHI <y_7(D)(11), y_12(3)>
[CHECK]: examining phi: y_21 = PHI <y_7(D)(11), y_12(3)>
[CHECK]: Found unguarded use: y_18 = PHI <y_21(4), y_16(6)>
[WORKLIST]: Update worklist with phi: y_18 = PHI <y_21(4), y_16(6)>
[CHECK]: examining phi: y_18 = PHI <y_21(4), y_16(6)>
[CHECK] Found def edge 1 in y_21 = PHI <y_7(D)(11), y_12(3)>
[CHECK] Found def edge 1 in y_18 = PHI <y_21(4), y_16(6)>
[CHECK]: Found unguarded use: h (x_22, y_18);
[CHECK]: examining phi: x_22 = PHI <x_6(D)(11), x_10(3)>
[BEFORE SIMPLICATION -- [DEF]:
it's confused by the CFG structure it seems.
