[Bug tree-optimization/114465] "x % const1 % const2" should be optimized if const1 % const2 == 0

[jsm28 at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114465

--- Comment #1 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Note that transforming x % 1 % -1 to x % -1 wouldn't strictly be valid (because
of undefined behavior from INT_MIN % -1), though hopefully cases with constant
1 or -1 get optimized to 0 anyway and the undefined behavior is only a problem
with a -1 that's not a constant.