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Thanks Also I found that some cases are also caught by a specialized routine to remove dead loops which is missing the case I noticed. odavd From: Daniel Berlin <dberlin at dberlin.org<mailto:dberlin at dberlin.org>> Date: Thursday, January 28, 2016 at 8:45 PM To: David Callahan <dcallahan at fb.com<mailto:dcallahan at fb.com>>, LLVM Dev Mailing list <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llv...

...lists.llvm.org> > *Sent: *Thursday, January 28, 2016 11:35:49 PM > *Subject: *Re: [llvm-dev] DCE in the presence of control flow. > > Thanks > Also I found that some cases are also caught by a specialized routine to > remove dead loops which is missing the case I noticed. > odavd > > From: Daniel Berlin <dberlin at dberlin.org> > Date: Thursday, January 28, 2016 at 8:45 PM > To: David Callahan <dcallahan at fb.com>, LLVM Dev Mailing list < > llvm-dev at lists.llvm.org> > Subject: Re: [llvm-dev] DCE in the presence of control flow. > &g...

...sts.llvm.org<mailto:llvm-dev at lists.llvm.org>> Sent: Thursday, January 28, 2016 11:35:49 PM Subject: Re: [llvm-dev] DCE in the presence of control flow. Thanks Also I found that some cases are also caught by a specialized routine to remove dead loops which is missing the case I noticed. odavd From: Daniel Berlin <dberlin at dberlin.org<mailto:dberlin at dberlin.org>> Date: Thursday, January 28, 2016 at 8:45 PM To: David Callahan <dcallahan at fb.com<mailto:dcallahan at fb.com>>, LLVM Dev Mailing list <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llv...

...sts.llvm.org<mailto:llvm-dev at lists.llvm.org>> Sent: Thursday, January 28, 2016 11:35:49 PM Subject: Re: [llvm-dev] DCE in the presence of control flow. Thanks Also I found that some cases are also caught by a specialized routine to remove dead loops which is missing the case I noticed. odavd From: Daniel Berlin <dberlin at dberlin.org<mailto:dberlin at dberlin.org>> Date: Thursday, January 28, 2016 at 8:45 PM To: David Callahan <dcallahan at fb.com<mailto:dcallahan at fb.com>>, LLVM Dev Mailing list <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llv...

...*Sent: *Thursday, January 28, 2016 11:35:49 PM >> *Subject: *Re: [llvm-dev] DCE in the presence of control flow. >> >> Thanks >> Also I found that some cases are also caught by a specialized routine to >> remove dead loops which is missing the case I noticed. >> odavd >> >> From: Daniel Berlin <dberlin at dberlin.org> >> Date: Thursday, January 28, 2016 at 8:45 PM >> To: David Callahan <dcallahan at fb.com>, LLVM Dev Mailing list < >> llvm-dev at lists.llvm.org> >> Subject: Re: [llvm-dev] DCE in the presence...

I have been looking at some internal codes looking for differences between Clang (specifically 3.7.1) and gcc (typically 4.8.1 but sometimes later). One area where I bumped into was dead code elimination in the presence of complex control flow. I note that the “aggressive dead code elimination” (ADCE.cpp) treats all branch operations as live (isa<TerminatorInst>(I)). Doing more requires

...sts.llvm.org<mailto:llvm-dev at lists.llvm.org>> Sent: Thursday, January 28, 2016 11:35:49 PM Subject: Re: [llvm-dev] DCE in the presence of control flow. Thanks Also I found that some cases are also caught by a specialized routine to remove dead loops which is missing the case I noticed. odavd From: Daniel Berlin <dberlin at dberlin.org<mailto:dberlin at dberlin.org>> Date: Thursday, January 28, 2016 at 8:45 PM To: David Callahan <dcallahan at fb.com<mailto:dcallahan at fb.com>>, LLVM Dev Mailing list <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llv...