https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107703
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:246127ab238bac6aa71a9b4ee1f6fabf776b5ccb commit r13-6598-g246127ab238bac6aa71a9b4ee1f6fabf776b5ccb Author: Jakub Jelinek <ja...@redhat.com> Date: Fri Mar 10 20:39:54 2023 +0100 libgcc, i386: Add __fix{,uns}bfti and __float{,un}tibf [PR107703] While DI <-> BF conversions can be handled (and are) through DI <-> XF <-> BF and for narrower integral modes even sometimes through DF or SF, because XFmode has 64-bit mantissa and so all the DImode values are exactly representable in XFmode. That is not the case for TImode, and while e.g. the HF -> TI conversions are IMHO useless in libgcc, because HFmode has -65504.0f16, 65504.0f16 range, all the integers will be already representable in SImode (or even HImode for unsigned) and so I think HF -> DI -> TI conversions are faster and valid, BFmode has roughly the same range as SFmode and so we absolutely need the TI -> BF conversions to avoid double rounding. As for BF -> TI conversions, they can be either also implemented in libgcc, or they can be implemented (as done in this commit) as BF -> SF -> TI conversions with the same code generation used elsewhere, just doing the 16-bit left shift of the bits - I think we don't need to handle sNaNs during the BF -> SF part because SF -> TI (which is already a libcall too) will handle that too. The BF -> SF -> TI path avoids wasting 32: 0000000000015e10 321 FUNC GLOBAL DEFAULT 13 __fixbfti@@GCC_13.0.0 89: 0000000000015f60 299 FUNC GLOBAL DEFAULT 13 __fixunsbfti@@GCC_13.0.0 2023-03-10 Jakub Jelinek <ja...@redhat.com> PR target/107703 * optabs.cc (expand_fix): For conversions from BFmode to integral, use shifts to convert it to SFmode first and then convert SFmode to integral. * soft-fp/floattibf.c: New file. * soft-fp/floatuntibf.c: New file. * config/i386/libgcc-glibc.ver: Export __float{,un}tibf @ GCC_13.0.0. * config/i386/64/t-softfp (softfp_extras): Add floattibf and floatuntibf. (CFLAGS-floattibf.c, CFLAGS-floatunstibf.c): Add -msse2.
