Index: mlir/lib/Target/LLVMIR/ConvertFromLLVMIR.cpp
===================================================================
--- mlir/lib/Target/LLVMIR/ConvertFromLLVMIR.cpp
+++ mlir/lib/Target/LLVMIR/ConvertFromLLVMIR.cpp
@@ -874,8 +874,24 @@
     Value rhs = processValue(inst->getOperand(1));
     if (!lhs || !rhs)
       return failure();
+
+    Type boolType = b.getI1Type();
+    Type resType = boolType;
+    if (LLVM::isCompatibleVectorType(lhs.getType()) ||
+        LLVM::isCompatibleVectorType(rhs.getType())) {
+      int64_t numLHSElements = 1, numRHSElements = 1;
+      if (LLVM::isCompatibleVectorType(lhs.getType()))
+        numLHSElements =
+            LLVM::getVectorNumElements(lhs.getType()).getFixedValue();
+      if (LLVM::isCompatibleVectorType(rhs.getType()))
+        numRHSElements =
+            LLVM::getVectorNumElements(rhs.getType()).getFixedValue();
+      resType =
+          VectorType::get({std::max(numLHSElements, numRHSElements)}, boolType);
+    }
+
     instMap[inst] = b.create<FCmpOp>(
-        loc, b.getI1Type(),
+        loc, resType,
         getFCmpPredicate(cast<llvm::FCmpInst>(inst)->getPredicate()), lhs, rhs);
     return success();
   }
Index: mlir/test/Dialect/LLVMIR/roundtrip.mlir
===================================================================
--- mlir/test/Dialect/LLVMIR/roundtrip.mlir
+++ mlir/test/Dialect/LLVMIR/roundtrip.mlir
@@ -449,7 +449,7 @@
 }
 
 // CHECK-LABEL: @fastmathFlags
-func.func @fastmathFlags(%arg0: f32, %arg1: f32, %arg2: i32) {
+func.func @fastmathFlags(%arg0: f32, %arg1: f32, %arg2: i32, %arg3: vector<2 x f32>, %arg4: vector<2 x f32>) {
 // CHECK: {{.*}} = llvm.fadd %arg0, %arg1 {fastmathFlags = #llvm.fastmath<fast>} : f32
 // CHECK: {{.*}} = llvm.fsub %arg0, %arg1 {fastmathFlags = #llvm.fastmath<fast>} : f32
 // CHECK: {{.*}} = llvm.fmul %arg0, %arg1 {fastmathFlags = #llvm.fastmath<fast>} : f32
@@ -461,8 +461,14 @@
   %3 = llvm.fdiv %arg0, %arg1 {fastmathFlags = #llvm.fastmath<fast>} : f32
   %4 = llvm.frem %arg0, %arg1 {fastmathFlags = #llvm.fastmath<fast>} : f32
 
-// CHECK: {{.*}} = llvm.fcmp "oeq" %arg0, %arg1 {fastmathFlags = #llvm.fastmath<fast>} : f32
+// CHECK: %[[SCALAR_PRED0:.+]] = llvm.fcmp "oeq" %arg0, %arg1 {fastmathFlags = #llvm.fastmath<fast>} : f32
   %5 = llvm.fcmp "oeq" %arg0, %arg1 {fastmathFlags = #llvm.fastmath<fast>} : f32
+// CHECK: %{{.*}} = llvm.add %[[SCALAR_PRED0]], %[[SCALAR_PRED0]] : i1
+  %typecheck_5 = llvm.add %5, %5 : i1
+// CHECK: %[[VEC_PRED0:.+]] = llvm.fcmp "oeq" %arg3, %arg4 {fastmathFlags = #llvm.fastmath<fast>} : vector<2xf32>
+  %vcmp = llvm.fcmp "oeq" %arg3, %arg4 {fastmathFlags = #llvm.fastmath<fast>} : vector<2xf32>
+// CHECK: %{{.*}} = llvm.add %[[VEC_PRED0]], %[[VEC_PRED0]] : vector<2xi1>
+  %typecheck_vcmp = llvm.add %vcmp, %vcmp : vector<2xi1>
 
 // CHECK: {{.*}} = llvm.fneg %arg0 {fastmathFlags = #llvm.fastmath<fast>} : f32
   %6 = llvm.fneg %arg0 {fastmathFlags = #llvm.fastmath<fast>} : f32