[all-commits] [llvm/llvm-project] 9d89b0: [WebAssembly] Fix trunc in FastISel (#138479)

[Pavel Verigo via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9d89b05f1147dc442794186f505e30a27ffe75a7
      https://github.com/llvm/llvm-project/commit/9d89b05f1147dc442794186f505e30a27ffe75a7
  Author: Pavel Verigo <58272683+pavelverigo at users.noreply.github.com>
  Date:   2025-05-06 (Tue, 06 May 2025)

  Changed paths:
    M llvm/lib/Target/WebAssembly/WebAssemblyFastISel.cpp
    A llvm/test/CodeGen/WebAssembly/fast-isel-pr138479.ll

  Log Message:
  -----------
  [WebAssembly] Fix trunc in FastISel (#138479)

Previous logic did not handle the case where the result bit size was
between 32 and 64 bits inclusive. I updated the if-statements for more
precise handling.

An alternative solution would have been to abort FastISel in case the
result type is not legal for FastISel.

Resolves: #64222.

This PR began as an investigation into the root cause of
https://github.com/ziglang/zig/issues/20966.

Godbolt link showing incorrect codegen on 20.1.0:
https://godbolt.org/z/cEr4vY7d4.



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