[Bug middle-end/116906] [12/13/14/15 Regression] floating point exception under -O2 optimization since r12-4195-gec0124e0acb556cdf5dba0e8d0ca6b69d9537fcc

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116906

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot 
gnu.org

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Found partial redundancy for expression {trunc_mod_expr,1,p_9(D)} (0008)
Inserted _33 = 1 % p_9(D);
 in predecessor 13 (0008)
Inserting expression in block 5 for code hoisting: {trunc_mod_expr,1,p_9(D)}
(0008)
Inserted _37 = 1 % p_9(D);
 in predecessor 5 (0008)
Inserting expression in block 3 for code hoisting: {trunc_mod_expr,1,p_9(D)}
(0008)
Inserted _39 = 1 % p_9(D);
 in predecessor 3 (0008)

with code hoisting disabled the issue is gone but the PRE insertion exposes
the issue, making 1 % p_9(D) computed on all paths and making the hositing
valid.