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* [Bug tree-optimization/80641] missed optimization with with std::vector resize in loop [not found] <bug-80641-4@http.gcc.gnu.org/bugzilla/> @ 2022-01-28 23:53 ` pinskia at gcc dot gnu.org 2023-08-09 23:15 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 2+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-01-28 23:53 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80641 --- Comment #15 from Andrew Pinski <pinskia at gcc dot gnu.org> --- This is interesting: _48 = _149 + 18446744073709551612; // _149 - 4 _63 = _55 + _48; _18 = _63 - _55; _19 = _18 /[ex] 4; _20 = (long unsigned int) _19; if (_55 != _63) _18 should be the same as _48 and the if statement should be if (_48 != 0) ^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/80641] missed optimization with with std::vector resize in loop [not found] <bug-80641-4@http.gcc.gnu.org/bugzilla/> 2022-01-28 23:53 ` [Bug tree-optimization/80641] missed optimization with with std::vector resize in loop pinskia at gcc dot gnu.org @ 2023-08-09 23:15 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 2+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-09 23:15 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80641 --- Comment #16 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Note starting in GCC 13 at -O3, we are able to optimize this all the way to: ``` int f () { int * _54; <bb 2> [local count: 114863531]: _54 = operator new (16); MEM <uint128_t> [(char * {ref-all})_54] = 0x30000000200000001; operator delete (_54, 16); return 0; } ``` If we change the name of the function to f rather than main. In GCC 14 we able to optimize even without the name change (there has been some inlining heurstic changes there). ^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <bug-80641-4@http.gcc.gnu.org/bugzilla/>
2022-01-28 23:53 ` [Bug tree-optimization/80641] missed optimization with with std::vector resize in loop pinskia at gcc dot gnu.org
2023-08-09 23:15 ` pinskia at gcc dot gnu.org
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