On Aug 25 2021, David Edelsohn via Gcc-patches wrote: > rs6000: inline ldouble __gcc_qsub > > While performing some tests of IEEE 128 float for PPC64LE, Michael > Meissner noticed that __gcc_qsub is substantially slower than > __gcc_qadd. __gcc_qsub valls __gcc_add with the second operand > negated. Because the functions normally are invoked through > libgcc shared object, the extra PLT overhead has a large impact > on the overall time of the function. Instead of trying to be > fancy with function decorations to prevent interposition, this > patch inlines the definition of __gcc_qadd into __gcc_qsub with > the negation propagated through the function. > > libgcc/ChangeLog: > > * config/rs6000/ibm-ldouble.c (__gcc_qsub): Inline negated > __gcc_qadd.
How about defining a static function that is used by both? Andreas. -- Andreas Schwab, sch...@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."
