https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93727
--- Comment #36 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jerry DeLisle <[email protected]>: https://gcc.gnu.org/g:c5eff89d859f98bf9e896eff22a65d1bbf0c5104 commit r17-710-gc5eff89d859f98bf9e896eff22a65d1bbf0c5104 Author: Jerry DeLisle <[email protected]> Date: Sun May 24 11:51:49 2026 -0700 Fortran: [PR93727] Fix EX format kind=8 output on ILP32 targets On 32-bit targets such as ARM where unsigned long is 32 bits, the kind=8 case in get_float_hex_string used unsigned long for frac_part. The kind=8 mantissa requires 52 bits (13 hex digits), so the cast silently truncated the upper bits, producing wrong hex output. In addition, converting a ~4.5e15 double value to a 32-bit unsigned long is out of range, which raised IEEE_INVALID_FLAG on ARM hardware. Fix kind=8 by using GFC_UINTEGER_8, which is guaranteed 64 bits on all targets. Update kind=10 and kind=16 to use GFC_UINTEGER_8 throughout for consistency with libgfortran conventions. PR fortran/93727 libgfortran/ChangeLog: * io/write_float.def (get_float_hex_string): Fix kind=8 frac_part from unsigned long to GFC_UINTEGER_8 to correct truncated hex output and IEEE_INVALID_FLAG on ILP32 targets. Update kind=10 and kind=16 to use GFC_UINTEGER_8 for consistency. Assisted by: Claude Sonnet 4.6
