https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114907
H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|Missing __extendhfbf2 in |__trunchfbf2 should be |libgcc |renamed to __extendhfbf2 --- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> --- convert_mode_scalar has if (GET_MODE_PRECISION (from_mode) == GET_MODE_PRECISION (to_mode)) /* Conversion between decimal float and binary float, same size. */ tab = DECIMAL_FLOAT_MODE_P (from_mode) ? trunc_optab : sext_optab; Since for HF->BF, DECIMAL_FLOAT_MODE_P (from_mode) is false, tab is sext_optab and __trunchfbf2 should be renamed to __extendhfbf2.