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Handle the case where the or disjoint folds immediately to a constant

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This commit is contained in:
Scott McMurray 2025-02-02 19:23:44 -08:00
parent 5e6ae8bb5c
commit f46e6be190
2 changed files with 18 additions and 2 deletions
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8
compiler/rustc_codegen_llvm/src/builder.rs
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@ -424,7 +424,13 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
fn or_disjoint(&mut self, a: &'ll Value, b: &'ll Value) -> &'ll Value {
unsafe {
let or = llvm::LLVMBuildOr(self.llbuilder, a, b, UNNAMED);
llvm::LLVMSetIsDisjoint(or, True);
// If a and b are both values, then `or` is a value, rather than
// an instruction, so we need to check before setting the flag.
// (See also `LLVMBuildNUWNeg` which also needs a check.)
if llvm::LLVMIsAInstruction(or).is_some() {
llvm::LLVMSetIsDisjoint(or, True);
}
or
}
}