Fix incorrect function name.

Author: silee2

mlir/lib/Conversion/GPUToLLVMSPV/GPUToLLVMSPV.cpp

@@ -476,7 +476,7 @@ struct GPUToLLVMSPVConversionPass final
     populateGpuMemorySpaceAttributeConversions(converter);
     patterns.add<GPUPrintfOpToLLVMCallLowering>(converter, /*addressSpace=*/2,
                                                 LLVM::cconv::CConv::SPIR_FUNC,
-                                                "Z6printfPU3AS2Kcz");
+                                                "_Z6printfPU3AS2Kcz");
 
     if (failed(applyPartialConversion(getOperation(), target,
                                       std::move(patterns))))

mlir/test/Conversion/GPUToLLVMSPV/printf.mlir

@@ -2,13 +2,13 @@
 
 gpu.module @test_module {
   // CHECK: llvm.mlir.global internal constant @[[$PRINT_GLOBAL:[A-Za-z0-9_]+]]("Hello: %d\0A\00")  {addr_space = 2 : i32}
-  // CHECK: llvm.func spir_funccc @Z6printfPU3AS2Kcz(!llvm.ptr<2>, ...) -> i32
+  // CHECK: llvm.func spir_funccc @_Z6printfPU3AS2Kcz(!llvm.ptr<2>, ...) -> i32
   // CHECK-LABEL: llvm.func spir_funccc @test_printf
   // CHECK: (%[[ARG0:.*]]: i32)
   gpu.func @test_printf(%arg0: i32) {
     // CHECK: %[[IMM0:.*]] = llvm.mlir.addressof @[[$PRINT_GLOBAL]] : !llvm.ptr<2>
     // CHECK-NEXT: %[[IMM2:.*]] = llvm.getelementptr %[[IMM0]][0, 0] : (!llvm.ptr<2>) -> !llvm.ptr<2>, !llvm.array<11 x i8>
-    // CHECK-NEXT: %{{.*}} = llvm.call spir_funccc @Z6printfPU3AS2Kcz(%[[IMM2]], %[[ARG0]]) vararg(!llvm.func<i32 (ptr<2>, ...)>) : (!llvm.ptr<2>, i32) -> i32
+    // CHECK-NEXT: %{{.*}} = llvm.call spir_funccc @_Z6printfPU3AS2Kcz(%[[IMM2]], %[[ARG0]]) vararg(!llvm.func<i32 (ptr<2>, ...)>) : (!llvm.ptr<2>, i32) -> i32
     gpu.printf "Hello: %d\n", %arg0 : i32
     gpu.return
   }

mlir/test/Integration/Dialect/XeVM/GPU/gpu_printf.mlir

@@ -22,7 +22,8 @@ module @test attributes {gpu.container_module} {
     %c1 = arith.constant 1 : index
     %c11 = arith.constant 11 : i32
     %c4 = arith.constant 4.0 : f32
-    // CHECK: "Hello: 11"
+    // CHECK: Hello: 11
+    // CHECK: Hello: 4.000000
     gpu.launch_func @test_module::@test_printf blocks in (%c1, %c1, %c1) threads in (%c1, %c1, %c1) args(%c11 : i32, %c4 : f32)
     return
   }