[Bug target/110181] New: longlong.h for RISCV should define count_leading_zeros and count_trailing_zeros and COUNT_LEADING_ZEROS_0 when ZBB is enabled

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110181

            Bug ID: 110181
           Summary: longlong.h for RISCV should define count_leading_zeros
                    and count_trailing_zeros and COUNT_LEADING_ZEROS_0
                    when ZBB is enabled
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---
            Target: riscv

I noticed that divdi3 on riscv32 with ZBB extensions always enabled still emits
a lookup table but we really should just use __builtin_clzll/__builtin_clz (for
the instruction).