https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109186
Bug ID: 109186 Summary: nearest(huge(x),-1.0_kind(x)) half of correct value Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran Assignee: unassigned at gcc dot gnu.org Reporter: john.harper at vuw dot ac.nz Target Milestone: --- With all four real kinds available in gfortran_12 nearest(x,y) with x = huge and y = -1 this program gave about half the correct result. Ifort gave correct results for the 3 different kinds it has: sp,dp,qp. The program: implicit none integer,parameter::sp = kind(1.0), dp=kind(1d0), ncases = 2, & ep = selected_real_kind(18),qp = selected_real_kind(33) character(*),parameter:: fmt(4) = & "(A,ES"//["16.08E2","26.17E3","30.20E4","44.34E4"]//")" character(24),dimension(2):: splist,dplist,eplist,qplist integer n real(sp),parameter::sp1 = 1.0_sp real(sp):: spx(ncases) = [huge(sp1),nearest(huge(sp1),-sp1)] data splist/'huge(sp1)','nearest(huge(sp1),-sp1)'/ real(dp),parameter::dp1 = 1.0_dp real(dp):: dpx(ncases) = [huge(dp1),nearest(huge(dp1),-dp1)] data dplist/'huge(dp1)','nearest(huge(dp1),-dp1)'/ real(ep),parameter::ep1 = 1.0_ep real(ep):: epx(ncases) = [huge(ep1),nearest(huge(ep1),-ep1)] data eplist/'huge(ep1)','nearest(huge(ep1),-ep1)'/ real(qp),parameter::qp1 = 1.0_qp real(qp):: qpx(ncases) = [huge(qp1),nearest(huge(qp1),-qp1)] data qplist/'huge(qp1)','nearest(huge(qp1),-qp1)'/ print fmt(1),(splist(n),spx(n),n=1,ncases) print fmt(2),(dplist(n),dpx(n),n=1,ncases) print fmt(3),(eplist(n),epx(n),n=1,ncases) print fmt(4),(qplist(n),qpx(n),n=1,ncases) end program The output on ubuntu (Linux 86_64) huge(sp1) 3.40282347E+38 nearest(huge(sp1),-sp1) 1.70141173E+38 huge(dp1) 1.79769313486231571E+308 nearest(huge(dp1),-dp1) 8.98846567431157854E+307 huge(ep1) 1.18973149535723176502E+4932 nearest(huge(ep1),-ep1) 5.94865747678615882511E+4931 huge(qp1) 1.1897314953572317650857593266280070E+4932 nearest(huge(qp1),-qp1) 5.9486574767861588254287966331400351E+4931