lkail added a comment.
In D65267#1610661 <https://reviews.llvm.org/D65267#1610661>, @hfinkel wrote:
> Is this something that could be fixed in TailDuplication?
TailDuplication doesn't take specific instructions, such as generating a immediate number, into account. We are able to add code to do such folding in tailduplication, however I think it's beyond taildup's duty.
For the test case, we have such MIR before taildup
bb.6.land.lhs.true.1:
; predecessors: %bb.4
successors: %bb.2(0x80000000); %bb.2(100.00%)
renamable $x5 = LI8 0
B %bb.2
bb.2.cleanup16:
; predecessors: %bb.3, %bb.1, %bb.6
liveins: $x5
$x3 = COPY killed renamable $x5
BLR8 implicit $lr8, implicit $rm, implicit $x3
So taildup copys `bb.2`s code at the end of `bb.6`.
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https://reviews.llvm.org/D65267/new/
https://reviews.llvm.org/D65267