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What if we try to evaluate this using standard-compliant Fortran? Interestingly, this is an open issue in the fortran-lang/stdlib project. f90 real(8) function f(x) real(8) :: x f = x**(1d0/3d0) endfunction I know real(8) isn't standard compliant but fixing that for this tiny example would be a headache. Then, compiling with -O3 gets us f_: movsd xmm1, QWORD PTR .LC0[rip] movsd xmm0, QWORD PTR [rdi] jmp pow .LC0: .long 1431655765 .long 1070945621
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