[Bug tree-optimization/72824] [5/6/7 Regression] Signed floating point zero semantics broken at optimization level -O3 (tree-loop-distribute-patterns)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72824

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 39066
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39066&action=edit
gcc7-pr72824.patch

Untested fix.