On Wed, 2010-03-17 at 11:27 +0800, fanqifei wrote: > You are correct. The reload pass emitted the clr.w insn. > However, I can see loop opt passes after reload: > problem1.c.174r.loop2_invariant1
Not unless you have a modified toolchain. We don't run loop opt after register allocation. See the list of optimization passes in the FSF GCC passes.c file. loop2 occurs before ira/postreload. If you do have a modified toolchain, then I doubt that the current loop passes would work right, since they were designed to handle pseudo-regs not hard-regs. Jim
