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Hi, How would I disable dead code elimination in llc? Can that be done via the command line or do I need to modify llc's source? Thanks Andrew Lukefahr andrewlukefahr at gmail.com Open Source, Open Minds -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20101206/cf656247/attachment.html>

...moves the volatile no-op below the multiply. tail call void asm sideeffect "NOP", ""() nounwind %2 = mul nsw i32 %y, %x tail call void asm sideeffect "NOP", ""() nounwind becomes.... mul r12, r12, r0 ... @APP NOP @NO_APP @APP NOP @NO_APP Andrew Lukefahr andrewlukefahr at gmail.com Open Source, Open Minds On Mon, Dec 6, 2010 at 2:08 PM, Jim Grosbach <grosbach at apple.com> wrote: > > On Dec 6, 2010, at 10:57 AM, John Criswell wrote: > > > On 12/6/10 11:39 AM, Andrew Lukefahr wrote: > >> Hi, > >> > >> How would I...

On Dec 6, 2010, at 10:57 AM, John Criswell wrote: > On 12/6/10 11:39 AM, Andrew Lukefahr wrote: >> Hi, >> >> How would I disable dead code elimination in llc? Can that be done via the command line or do I need to modify llc's source? > > You can use llc --help-hidden to see a list of options. There are several -disable-xxx options that disable various code

...tions that disable various code generator optimizations. That said, I, like Duncan, wasn't aware that llc did any dead-code elimination (beyond peephole optimization). Are you sure llc is removing the instructions you care about? -- John T. > > Thanks > > Andrew Lukefahr > andrewlukefahr at gmail.com <mailto:andrewlukefahr at gmail.com> > > Open Source, Open Minds -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20101206/4a7673b2/attachment.html>