search for: dummy_cmp

...to replace the assembly code shown above, by just this: add R0, R1, R2 breq Label The ‘cmp’ was redundant in this case because the add instruction already set the Z (zero) flag I tried several things, but I got stuck in some way in all of them. For example, an approach that I tried is to have a ‘dummy_cmp’ instruction, that I generate instead of the regular ‘cmp’ when the comparison is redundant. The ‘dummy_cmp’ must be removed at a latter stage, ideally during the selDAGToDAG phase, but I failed to do so. - So my first question is. How do I remove the ‘dummy_cmp’ node in the MyTargetISelDAGtoDAG:...

...above, by just this: > > add R0, R1, R2 > breq Label > > The ‘cmp’ was redundant in this case because the add instruction already set the Z (zero) flag > > I tried several things, but I got stuck in some way in all of them. For example, an approach that I tried is to have a ‘dummy_cmp’ instruction, that I generate instead of the regular ‘cmp’ when the comparison is redundant. The ‘dummy_cmp’ must be removed at a latter stage, ideally during the selDAGToDAG phase, but I failed to do so. > > - So my first question is. How do I remove the ‘dummy_cmp’ node in the MyTargetISe...

...ve, by just this: > > add R0, R1, R2 > breq Label > > The ‘cmp’ was redundant in this case because the add instruction already set the Z (zero) flag > > I tried several things, but I got stuck in some way in all of them. For example, an approach that I tried is to have a ‘dummy_cmp’ instruction, that I generate instead of the regular ‘cmp’ when the comparison is redundant. The ‘dummy_cmp’ must be removed at a latter stage, ideally during the selDAGToDAG phase, but I failed to do so. > > - So my first question is. How do I remove the ‘dummy_cmp’ node in the MyTargetIS...