Djordje Todorovic fa2daaeff8 [2/2][RemoveRedundantDebugValues] Add a Pass that removes redundant DBG_VALUEs ...

This patch adds the forward scan for finding redundant DBG_VALUEs.

This analysis aims to remove redundant DBG_VALUEs by going forward
in the basic block by considering the first DBG_VALUE as a valid
until its first (location) operand is not clobbered/modified.
For example:

(1) DBG_VALUE $edi, !"var1", ...
(2) <block of code that does affect $edi>
(3) DBG_VALUE $edi, !"var1", ...
 ...
in this case, we can remove (3).

Differential Revision: https://reviews.llvm.org/D105280

2021-07-15 00:08:31 -07:00

7.4 KiB

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