add test for #138138

Author: AlexMaclean

llvm/test/CodeGen/NVPTX/byval-const-global.ll

@@ -0,0 +1,33 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mcpu=sm_20 | FileCheck %s
+; RUN: %if ptxas %{ llc < %s -mcpu=sm_20 | %ptxas-verify %}
+
+target triple = "nvptx64-nvidia-cuda"
+
+%struct = type { [2 x i64] }
+@G = external constant %struct
+
+define void @foo() {
+; CHECK-LABEL: foo(
+; CHECK:       {
+; CHECK-NEXT:    .reg .b64 %rd<3>;
+; CHECK-EMPTY:
+; CHECK-NEXT:  // %bb.0:
+; CHECK-NEXT:    ld.global.u64 %rd1, [G];
+; CHECK-NEXT:    ld.global.u64 %rd2, [G+8];
+; CHECK-NEXT:    { // callseq 0, 0
+; CHECK-NEXT:    .param .align 8 .b8 param0[16];
+; CHECK-NEXT:    st.param.b64 [param0], %rd1;
+; CHECK-NEXT:    st.param.b64 [param0+8], %rd2;
+; CHECK-NEXT:    call.uni
+; CHECK-NEXT:    bar,
+; CHECK-NEXT:    (
+; CHECK-NEXT:    param0
+; CHECK-NEXT:    );
+; CHECK-NEXT:    } // callseq 0
+; CHECK-NEXT:    ret;
+  call void @bar(ptr byval(%struct) @G)
+  ret void
+}
+
+declare void @bar(ptr)