Index: mlir/lib/Conversion/StandardToSPIRV/StandardToSPIRV.td
===================================================================
--- mlir/lib/Conversion/StandardToSPIRV/StandardToSPIRV.td
+++ mlir/lib/Conversion/StandardToSPIRV/StandardToSPIRV.td
@@ -20,6 +20,10 @@
       Pat<(src SPV_ScalarOrVectorOf<type>:$l, SPV_ScalarOrVectorOf<type>:$r),
           (tgt $l, $r)>;
 
+class UnaryOpPattern<Type type, Op src, Op tgt> :
+      Pat<(src type:$input),
+          (tgt $input)>;
+
 def : BinaryOpPattern<SPV_Bool, AndOp, SPV_LogicalAndOp>;
 def : BinaryOpPattern<SPV_Bool, OrOp, SPV_LogicalOrOp>;
 def : BinaryOpPattern<SPV_Float, AddFOp, SPV_FAddOp>;
@@ -27,6 +31,9 @@
 def : BinaryOpPattern<SPV_Float, MulFOp, SPV_FMulOp>;
 def : BinaryOpPattern<SPV_Float, RemFOp, SPV_FRemOp>;
 def : BinaryOpPattern<SPV_Float, SubFOp, SPV_FSubOp>;
+def : UnaryOpPattern<SPV_Integer, SIToFPOp, SPV_ConvertSToFOp>;
+def : UnaryOpPattern<SPV_Float, FPExtOp, SPV_FConvertOp>;
+def : UnaryOpPattern<SPV_Float, FPTruncOp, SPV_FConvertOp>;
 
 // Constant Op
 // TODO(ravishankarm): Handle lowering other constant types.
Index: mlir/test/Conversion/StandardToSPIRV/std-to-spirv.mlir
===================================================================
--- mlir/test/Conversion/StandardToSPIRV/std-to-spirv.mlir
+++ mlir/test/Conversion/StandardToSPIRV/std-to-spirv.mlir
@@ -174,6 +174,28 @@
   return
 }
 
+//===----------------------------------------------------------------------===//
+// std.fpext
+//===----------------------------------------------------------------------===//
+
+// CHECK-LABEL: @fpext
+func @fpext(%arg0 : f32) {
+  // CHECK: spv.FConvert
+  %0 = std.fpext %arg0 : f32 to f64
+  return
+}
+
+//===----------------------------------------------------------------------===//
+// std.fptrunc
+//===----------------------------------------------------------------------===//
+
+// CHECK-LABEL: @fptrunc
+func @fptrunc(%arg0 : f64) {
+  // CHECK: spv.FConvert
+  %0 = std.fptrunc %arg0 : f64 to f32
+  return
+}
+
 //===----------------------------------------------------------------------===//
 // std.select
 //===----------------------------------------------------------------------===//
@@ -185,3 +207,14 @@
   %1 = select %0, %arg0, %arg1 : i32
   return
 }
+
+//===----------------------------------------------------------------------===//
+// std.sitofp
+//===----------------------------------------------------------------------===//
+
+// CHECK-LABEL: @sitofp
+func @sitofp(%arg0 : i32) {
+  // CHECK: spv.ConvertSToF
+  %0 = std.sitofp %arg0 : i32 to f32
+  return
+}