From f7b6cc1efab188a375a6932d879cb5510618d698 Mon Sep 17 00:00:00 2001
From: Dominik Montada <dominik.montada@arm.com>
Date: Thu, 2 Apr 2026 20:55:45 +0200
Subject: [PATCH] [llvm-reduce] Set the target triple before parsing machine
 functions (#189989)

Make sure that the module has a target triple set before trying to parse
machine functions. This can be required for (downstream) targets if MIR
parsing relies on features guarded by the target triple.
---
 .../llvm-reduce/mir/set-triple-on-module.mir     | 16 ++++++++++++++++
 llvm/tools/llvm-reduce/ReducerWorkItem.cpp       |  3 +++
 2 files changed, 19 insertions(+)
 create mode 100644 llvm/test/tools/llvm-reduce/mir/set-triple-on-module.mir

diff --git a/llvm/test/tools/llvm-reduce/mir/set-triple-on-module.mir b/llvm/test/tools/llvm-reduce/mir/set-triple-on-module.mir
new file mode 100644
index 000000000000..1f1e6b145bd3
--- /dev/null
+++ b/llvm/test/tools/llvm-reduce/mir/set-triple-on-module.mir
@@ -0,0 +1,16 @@
+# REQUIRES: x86-registered-target
+
+# RUN: llvm-reduce -simplify-mir -mtriple="x86_64-unknown-linux-gnu" --test FileCheck --test-arg --check-prefix=CHECK-INTERESTINGNESS --test-arg %s --test-arg --input-file %s -o %t
+# RUN: FileCheck %s < %t
+
+# CHECK-INTERESTINGNESS: RET64
+
+# CHECK: target triple = "x86_64-unknown-linux-gnu"
+# CHECK: name:            func
+
+---
+name: func
+body: |
+  bb.0:
+    RET64
+...
diff --git a/llvm/tools/llvm-reduce/ReducerWorkItem.cpp b/llvm/tools/llvm-reduce/ReducerWorkItem.cpp
index c479233a712e..b7e8118ea73a 100644
--- a/llvm/tools/llvm-reduce/ReducerWorkItem.cpp
+++ b/llvm/tools/llvm-reduce/ReducerWorkItem.cpp
@@ -859,6 +859,9 @@ llvm::parseReducerWorkItem(StringRef ToolName, StringRef Filename,
 
     std::unique_ptr<Module> M = MParser->parseIRModule(SetDataLayout);
 
+    if (!TheTriple.empty())
+      M->setTargetTriple(TheTriple);
+
     MMM->MMI = std::make_unique<MachineModuleInfo>(TM.get());
     MParser->parseMachineFunctions(*M, *MMM->MMI);
     MMM->M = std::move(M);