2010/1/18 Adam Nemet <adambne...@gmail.com>: > Sorry for jumping in late. See make_file_assigment in combine.c. > > The problem usually is that: > > (set A (ior (and B C1) OTHER)) > > can only be turned into a bit-insertion if A and B happen to be the same > pseudos. > > Adam > Thank you, Adam. The problem is that before combine pass the statement is expressed in 6 insns. The insns can't be combined into the expected pattern (set A (ior (and B C1) OTHER)). Otherwise, make_field_assignment can do the job of simplifying the SET insn.
Qifei Fan
