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...ug information or unexpected stepping/debugging experience. Not to mention that having good stepping/debugging experience is the major reason to compile at /O0. I recently suggested a patch to disable one specific DAG combine at /O0 that broke stepping on a particular case (http://reviews.llvm.org/D19268), but other similar cases could appear. In the same way, another patch was submitted last year for a similar reason (http://reviews.llvm.org/D7181). So, since the DAGCombiner is in fact an optimization pass, could it be disabled completely (or partially?) in /O0? And how should it be done? For ex...

...ion or unexpected stepping/debugging experience. Not to mention that having good stepping/debugging experience is the major reason to compile at /O0. > > I recently suggested a patch to disable one specific DAG combine at /O0 that broke stepping on a particular case (http://reviews.llvm.org/D19268 <http://reviews.llvm.org/D19268>), but other similar cases could appear. In the same way, another patch was submitted last year for a similar reason (http://reviews.llvm.org/D7181 <http://reviews.llvm.org/D7181>). > > So, since the DAGCombiner is in fact an optimization pass, co...