[PATCH] D132053: [BOLT] Fix ignored LP at fragment start

[Fabian Parzefall via Phabricator via llvm-commits]

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If the first block of a fragment is also a landing pad, the landing pad
is not used if an exception is thrown. This is because the landing pad
is at the same start address that the corresponding LSDA describes. In
that case, the offset in the call site records to refer to that landing
pad is zero, and a zero offset is interpreted by the personality
function as "no handler" and ignored.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132053

Files:
  bolt/lib/Core/BinaryEmitter.cpp
  bolt/test/runtime/X86/Inputs/lp-fragment-start.fdata
  bolt/test/runtime/X86/lp-fragment-start.s

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