On 26/10/2018 00:46, Paul Koning wrote: > In my target (pdp11) which has 16 bit words, I see some test suite failures > because of unresolved references to __cmpsi2. The strange thing is that most > of the time 32 bit compares are expanded by GCC into a sequence of word > compares and branches. > > Why would GCC sometimes generate library calls for this? Can I make it stop > doing that by writing patterns (define_expand or define_insn) for cmpsi2? > That may be useful because I think I can generate better code, but still it's > puzzling that the behavior is inconsistent. > > paul >
Yes. See, for example, the analogous case in the ARM port for cmpdi2. R.
