[PATCH] D108840: [WebAssembly] Fix FastISel of condition in different block (PR51651)

[Nikita Popov via Phabricator via llvm-commits]

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If the icmp is in a different block, then the register for the icmp operand may not be initialized, as it nominally does not have cross-block uses. Add a check that the icmp is in the same block as the branch, which should be the common case.

This matches what X86 FastISel does: https://github.com/llvm/llvm-project/blob/5b6b090cf2129228f05d7d0f504676b67f7524cf/llvm/lib/Target/X86/X86FastISel.cpp#L1648

Fixes https://bugs.llvm.org/show_bug.cgi?id=51651.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D108840

Files:
  llvm/lib/Target/WebAssembly/WebAssemblyFastISel.cpp
  llvm/test/CodeGen/WebAssembly/pr51651.ll

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