[PATCH] D57718: [PPC] Adjust the computed branch offset for the possible shorter distance

Wed Feb 13 10:14:08 PST 2019

sdardis added a comment.

In D57718#1393615 <https://reviews.llvm.org/D57718#1393615>, @Carrot wrote:

> In D57718#1393504 <https://reviews.llvm.org/D57718#1393504>, @jsji wrote:
>
> > Any testcases that can show the problem and test the fix? Thanks.
>
>
> It can only be triggered by a very large (>32KB) function body because the range of conditional branch is +/- 32KB.
>
> In our case, the large function body is caused by aggressive thinlto guided inlining.
>
> So no small test case can demonstrate the problem :(

You can use the assembly directive '.space' to create arbitrary sized basic blocks. See test/CodeGen/RISCV/branch-relaxation.ll for examples.

Repository:
  rL LLVM

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  https://reviews.llvm.org/D57718/new/

https://reviews.llvm.org/D57718