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llvm_21: backport patch for selectiondag freeze condition miscompile (#542049)

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Alyssa Ross
2026-07-15 11:47:18 +00:00
committed by GitHub
parent 45ae10c84d f8a025c964
commit b066e66ff7
2 changed files with 3988 additions and 1 deletions
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3975
pkgs/development/compilers/llvm/21/llvm/sdag-freeze-condition-in-select-of-load-fold.patch Normal file
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14
pkgs/development/compilers/llvm/common/llvm/default.nix
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@@ -222,7 +222,19 @@ stdenv.mkDerivation (
hash = "sha256-3hkbYPUVRAtWpo5qBmc2jLZLivURMx8T0GQomvNZesc=";
stripLen = 1;
}
);
)
++ lib.optionals (lib.versions.major release_version == "21") [
# Several LLVM versions have a bug in SelectionDAG that causes
# miscompilations around conditional poisions. This was exposed due to
# Rust 1.97.0 exercising the involved code path heavily and generating
# segfaulting code. The patch was made to LLVM 23, but the tests have
# many conflicts, so we vendor a version-specific modified version.
#
# Rust issue: https://github.com/rust-lang/rust/issues/159035
# LLVM issue: https://github.com/llvm/llvm-project/issues/208611
# LLVM PR: https://github.com/llvm/llvm-project/pull/208683
(getVersionFile "llvm/sdag-freeze-condition-in-select-of-load-fold.patch")
];
nativeBuildInputs = [
cmake