[PATCH] D89423: Explicitly check for entry basic block, rather than relying on MachineBasicBlock::pred_empty.

[Rahman Lavaee via Phabricator via llvm-commits]

rahmanl created this revision.
rahmanl added reviewers: tmsriram, snehasish, amharc.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.
rahmanl requested review of this revision.

Sometimes in unoptimized code, we have dangling unreachable basic blocks with no predecessors. Basic block sections should be emitted for those as well. Without this patch, the included test fails with a fatal error in ```AsmPrinter::emitBasicBlockEnd```.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D89423

Files:
  llvm/include/llvm/CodeGen/MachineBasicBlock.h
  llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  llvm/lib/CodeGen/MachineBasicBlock.cpp
  llvm/test/CodeGen/X86/basic-block-sections-unreachable.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D89423.298231.patch
Type: text/x-patch
Size: 4838 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20201014/5e91dfde/attachment.bin>