[Bug 215681] head -r310854: TARGET_ARCH=powerpc buildkernel via clang 3.9.1: sys/powerpc/aim/trap_subr32.S:409:2: error: too few operands for instruction

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215681

--- Comment #4 from Mark Millard <markmi at dsl-only.net> ---
Created attachment 178692
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178692&action=edit
Avoid omitting the supposedly optional operand to cmp instruction

clang 3.9.1 targeting powerpc (32-bit) reports a missing operand
error for cmp with 3 operands, requiring the supposedly optional
operand.

The kernel has one example of the rejected notation: change
it to supply all 4 operands --like the other cmp usage in the
same file.

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