fanqifei <fanqi...@gmail.com> writes: > Paolo Bonzini said that insv instruction might be synthesized > later by combine. But combine only works on at most 3 instructions and > insv is not generated in such case. > So exactly when will the insv pattern be recognized and how does > the coding style affect it?
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
