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cmpsi2 library calls?
- From: Paul Koning <paulkoning at comcast dot net>
- To: GCC Development <gcc at gcc dot gnu dot org>
- Date: Thu, 25 Oct 2018 19:46:41 -0400
- Subject: cmpsi2 library calls?
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