[Bug middle-end/77568] [7 regression] CSE/PRE/Hoisting blocks common instruction contractions

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77568

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Keywords|                            |FIXME

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The code in tree-ssa-math-opts.c has the following comment in it:
      /* For now restrict this operations to single basic blocks.  In theory
         we would want to support sinking the multiplication in
         m = a*b;
         if ()
           ma = m + c;
         else
           d = m;
         to form a fma in the then block and sink the multiplication to the
         else block.  */
      if (gimple_bb (use_stmt) != gimple_bb (mul_stmt))
        return false;