[Bug tree-optimization/34030] [4.1/4.2 Regression] ICE in in compare_values_warnv, at tree-vrp.c:701

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2007-11-16 18:20 -------
Or rather a frontend bug if it doesn't promote either the integer to a pointer
or the pointer to an integer:

./cc1 -quiet -O2 t.i -quiet
t.i: In function ‘foo’:
t.i:9: warning: comparison between pointer and integer
                      ^^^^^^^
t.i:4: internal compiler error: in compare_values_warnv, at tree-vrp.c:701
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

with trunk we get

  if ((void *) (1 << mynum & (unsigned int) myvar) == 0B && mynum > 0)

while with 4.2 we have

  if (((unsigned int) myvar >> mynum & 1) == 0B && mynum > 0)

which hints at a fold bug again.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34030