[PATCH] D48019: [mips] Handle branch expansion corner cases

[Aleksandar Beserminji via Phabricator via llvm-commits]

abeserminji created this revision.
abeserminji added reviewers: petarj, sdardis.
Herald added subscribers: atanasyan, arichardson, dschuff.

With this patch, it is calculated if potential **jump** instruction and target are in the same segment.
If so, **jump** instruction with immediate field is used.

Also, branch expansion does not cover cases where offset does not fit immediate value of a bc/j instructions.
With this patch, offset is stored into registers, and then **jump register** instruction is used.


Repository:
  rL LLVM

https://reviews.llvm.org/D48019

Files:
  lib/Target/Mips/MipsBranchExpansion.cpp
  lib/Target/Mips/MipsInstrInfo.cpp
  test/CodeGen/Mips/longbranch/long-branch-expansion-1.ll
  test/CodeGen/Mips/longbranch/long-branch-expansion-2.ll
  test/CodeGen/Mips/longbranch/long-branch-expansion-3.ll

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