[PATCH] ADCE: Remove debug info intrinsics in dead scopes
Adrian Prantl via llvm-commits
llvm-commits at lists.llvm.org
Tue Mar 29 12:48:47 PDT 2016
> On Mar 29, 2016, at 12:34 PM, Duncan P. N. Exon Smith <dexonsmith at apple.com> wrote:
>
> During ADCE, track which debug info scopes still have live references
> from the code, and delete debug info intrinsics for the dead ones.
>
> These intrinsics describe the locations of variables (in registers or
> stack slots). If there's no code left corresponding to a variable's
> scope, then there's no way to reference the variable in the debugger and
> it doesn't matter what its value is.
>
> I add a DEBUG printout when the described location in an SSA register,
> in case it helps some trying to track down why locations get lost.
> However, we still delete these; the root problem is that the scope
> itself isn't attached to any real code.
Thanks!
>
> <0001-ADCE-Remove-debug-info-intrinsics-in-dead-scopes.patch>
One review comment: There should also be a testcase where the scope is in an inlined function.
-- adrian
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