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# 83e6d2ed 18-Sep-2023 Jon Roelofs <jonathan_roelofs@apple.com>

Revert "[ARM] Always lower direct calls as direct when the outliner is enabled (#66434)"

This reverts commit 003bcad9a8b21e15e3786a52b1dafa844075ab84.

ARM folks say it regresses some of their bench

Revert "[ARM] Always lower direct calls as direct when the outliner is enabled (#66434)"

This reverts commit 003bcad9a8b21e15e3786a52b1dafa844075ab84.

ARM folks say it regresses some of their benchmarks:
https://github.com/llvm/llvm-project/pull/66434#issuecomment-1722424162

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Revision tags: llvmorg-17.0.0
# 003bcad9 15-Sep-2023 Jon Roelofs <jonathan_roelofs@apple.com>

[ARM] Always lower direct calls as direct when the outliner is enabled (#66434)

The indirect lowering hinders the outliner's ability to see that
sequences are in fact common, since the sequence sim

[ARM] Always lower direct calls as direct when the outliner is enabled (#66434)

The indirect lowering hinders the outliner's ability to see that
sequences are in fact common, since the sequence similarity is rendered
opaque by the register callee. The size savings from making them
indirect seems to be dwarfed by the outliner's savings from
de-duplication.

rdar://115178034
rdar://115459865

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# a454a11d 15-Jul-2016 James Molloy <james.molloy@arm.com>

[ARM] Prefer indirect calls in minsize mode

... When we emit several calls to the same function in the same basic block.

An indirect call uses a "BLX r0" instruction which has a 16-bit encoding. If

[ARM] Prefer indirect calls in minsize mode

... When we emit several calls to the same function in the same basic block.

An indirect call uses a "BLX r0" instruction which has a 16-bit encoding. If many calls are made to the same target, this can enable significant code size reductions.

llvm-svn: 275537

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