On Fri, Sep 21, 2007 at 09:01:15AM -0700, Winson Yung wrote: > Hi there, in the following mips 32bit atomic cmp_xchg api, I was > wondering why there is no nop after the two branch instructions. Does > this introduce a bug, or is it a "feature" in the code to use the > delay slot for an instructino to execut something whether or not they > take the branch. > > #define __arch_compare_and_exchange_xxx_32_int(mem, newval, oldval, rel, acq) \ Manual filling of the delay slot is only required when the assembler is in .set noreorder mode. Otherwise - and that's the default mode - it will try do something sensible with the delay slot itself. Ralf
