https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66787

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |8.3.0
          Component|c++                         |tree-optimization
           Keywords|                            |missed-optimization
      Known to work|                            |12.0

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks like it is fixed on the trunk:

t9.cc.044t.tailr1:Eliminated tail recursion in bb 4 : _14 = Array<unsigned
char, 3>::computeSubSize (this_10(D), _5);
t9.cc.044t.tailr1:Eliminated tail recursion in bb 7 : BlendingTable::create
(this_16(D), _11, 255, 255);
t9.cc.044t.tailr1:Eliminated tail recursion in bb 5 : BlendingTable::create
(this_16(D), dst_15, _10, 255);
t9.cc.044t.tailr1:Eliminated tail recursion in bb 3 : BlendingTable::create
(this_16(D), dst_15, src_13, _9);
t9.cc.044t.tailr1:Eliminated tail recursion in bb 8 : BlendingTable::print
(this_14(D), _10, 255, 255);
t9.cc.044t.tailr1:Eliminated tail recursion in bb 6 : BlendingTable::print
(this_14(D), dst_17, _9, 255);
t9.cc.044t.tailr1:Eliminated tail recursion in bb 4 : BlendingTable::print
(this_14(D), dst_17, src_16, _8);

It was not working in GCC 8.0 though:
t9.cc.043t.tailr1:Eliminated tail recursion in bb 4 : _15 = Array<unsigned
char, 3>::computeSubSize (this_12, _5);
t9.cc.043t.tailr1:Eliminated tail recursion in bb 10 : BlendingTable::create
(this_16, _11, 255, 255);
t9.cc.043t.tailr1:Eliminated tail recursion in bb 8 : BlendingTable::create
(this_16, dst_15, _10, 255);
t9.cc.043t.tailr1:Eliminated tail recursion in bb 6 : BlendingTable::create
(this_16, dst_15, src_13, _9);

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