[PATCH] D140633: [lld][ARM] don't use short thumb thunks if no branch range extension

[Ties Stuij via Phabricator via llvm-commits]

stuij added a comment.

In D140633#4015503 <https://reviews.llvm.org/D140633#4015503>, @MaskRay wrote:

>> On these architectures (v4, v5, and most of v6), we could replace the b.w with a Thumb b (2) instruction, but that would in an ideal situation only give us an extra range of 2048 bytes on top of the 4MB range of a BL,
>
> Q: what is "Thumb b (2)" ?

Its version 2 of the Thumb b instruction as per the v4-v6 Arm Architecture Reference Manual (doc nr: ddi 0100i).
So section A7.1.14 of https://documentation-service.arm.com/static/5f8dacc8f86e16515cdb865a

>> if a thunk section happens to be placed on the outer range of a BL and the stars are aligned.
>
> stars?

'stars are aligned' figure of speech embellishing the notion that it's very unlikely. That part didn't include any actual information.


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