From e22d6d569fcbcf960261d71f67d554a7859fdfeb Mon Sep 17 00:00:00 2001
From: Ulrik Sverdrup <bluss@users.noreply.github.com>
Date: Sat, 19 Mar 2016 22:02:33 +0100
Subject: [PATCH] Fix LLVMRustSetHasUnsafeAlgebra to only have effect on
 instructions

---
 src/rustllvm/RustWrapper.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/rustllvm/RustWrapper.cpp b/src/rustllvm/RustWrapper.cpp
index f488a517b23..33174c1e9df 100644
--- a/src/rustllvm/RustWrapper.cpp
+++ b/src/rustllvm/RustWrapper.cpp
@@ -165,8 +165,10 @@ extern "C" void LLVMRemoveFunctionAttrString(LLVMValueRef fn, unsigned index, co
 }
 
 // enable fpmath flag UnsafeAlgebra
-extern "C" void LLVMRustSetHasUnsafeAlgebra(LLVMValueRef Instr) {
-    unwrap<Instruction>(Instr)->setHasUnsafeAlgebra(true);
+extern "C" void LLVMRustSetHasUnsafeAlgebra(LLVMValueRef V) {
+    if (auto I = dyn_cast<Instruction>(unwrap<Value>(V))) {
+        I->setHasUnsafeAlgebra(true);
+    }
 }
 
 extern "C" LLVMValueRef LLVMBuildAtomicLoad(LLVMBuilderRef B,