http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19430
--- Comment #21 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
$ ~/test1/205036M/build/gcc/cc1 -O1 -Wuninitialized test.c
-fdump-tree-all-all-lineno
$ cat test.c.139t.uninit1
foo (intD.6 iD.1789)
{
intD.6 jD.1792;
intD.6 _5;
intD.6 _7;
;; basic block 2, loop depth 0, count 0, freq 10000, maybe hot
;; prev block 0, next block 5, flags: (NEW, REACHABLE)
;; pred: ENTRY [100.0%] (FALLTHRU,EXECUTABLE)
;; starting at line 10
[test.c : 10:11] # .MEM_4 = VDEF <.MEM_2(D)>
# USE = nonlocal { D.1792 } (escaped)
# CLB = nonlocal { D.1792 } (escaped)
_5 = barD.1786 (i_3(D));
[test.c : 10:6] if (_5 != 0)
goto <bb 3>;
else
goto <bb 5>;
;; succ: 3 [39.0%] (TRUE_VALUE,EXECUTABLE)
;; 5 [61.0%] (FALSE_VALUE,EXECUTABLE)
;; basic block 5, loop depth 0, count 0, freq 6102, maybe hot
;; prev block 2, next block 3, flags: (NEW)
;; pred: 2 [61.0%] (FALSE_VALUE,EXECUTABLE)
;;
goto <bb 4>;
;; succ: 4 [100.0%] (FALLTHRU)
;; basic block 3, loop depth 0, count 0, freq 3898, maybe hot
;; prev block 5, next block 4, flags: (NEW, REACHABLE)
;; pred: 2 [39.0%] (TRUE_VALUE,EXECUTABLE)
;; starting at line 11
[test.c : 11:9] # .MEM_6 = VDEF <.MEM_4>
# USE = nonlocal { D.1792 } (escaped)
# CLB = nonlocal { D.1792 } (escaped)
bazD.1788 ([test.c : 11] &jD.1792);
;; succ: 4 [100.0%] (FALLTHRU,EXECUTABLE)
;; basic block 4, loop depth 0, count 0, freq 10000, maybe hot
;; prev block 3, next block 1, flags: (NEW, REACHABLE)
;; pred: 5 [100.0%] (FALLTHRU)
;; 3 [100.0%] (FALLTHRU,EXECUTABLE)
;; starting at line 14
# .MEM_1 = PHI <.MEM_4(5), .MEM_6(3)>
[test.c : 14:3] # VUSE <.MEM_1>
_7 = jD.1792;
# .MEM_8 = VDEF <.MEM_1>
jD.1792 ={v} {CLOBBER};
[test.c : 14:3] # VUSE <.MEM_8>
return _7;
;; succ: EXIT [100.0%]
}
It seems one could follow every operand of the MEM_1 PHI node until you find
the MEM_4 = VDEF <.MEM_2(D)>. But perhaps this may produce a lot of false
positives.
The uninit pass avoids virtual operands on purpose, so it cannot be that
trivial.
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