[PATCH] D35579: [SimplifyCFG] Generate lookup tables based on a function attribute

[Sumanth Gundapaneni via Phabricator via llvm-commits]

sgundapa added a comment.

For backends with "tightly coupled memory", in scenarios where the data is far away from text pays a good amount of penalty in terms of latency.
Hexagon is one such backend. The tables (both lookup and jump) which are being generated are treated as globals with internal linkage and by default
will be placed in read only data.

Interestingly when programmers specify the command line flag "-fno-jump-tables", they assume there is no data that goes in to other sections.
In case of llvm, the attribute "no-jump-tables" has no effect on simplifyCFG which generates the lookup table. This leads me to introduce "no-lookup-tables"


https://reviews.llvm.org/D35579