[PATCH] D71954: [PowerPC] Change default for unaligned FP access for older subtargets

[Nemanja Ivanovic via Phabricator via llvm-commits]

nemanjai created this revision.
nemanjai added reviewers: hfinkel, PowerPC, kernigh.
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nemanjai updated this revision to Diff 235458.
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Herald added a subscriber: wuzish.

Add the feature to the BG cores as well.


This is a fix for https://bugs.llvm.org/show_bug.cgi?id=40554

Some CPU's trap to the kernel on unaligned floating point access and there are kernels that do not handle the interrupt. The program then fails with a SIGBUS according to the PR. This just switches the default for unaligned access to only allow it on recent server CPUs that are known to allow this.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D71954

Files:
  llvm/lib/Target/PowerPC/PPC.td
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/lib/Target/PowerPC/PPCSubtarget.h
  llvm/test/CodeGen/PowerPC/unaligned-floats.ll

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