[NVPTX] Add errors for incorrect CUDA addrpaces

The CUDA API only accepts kernel params in the global and generic
address spaces, so display an error message when attempting to
emit pointers outside those address-spaces from CUDA (but still
allow them for OpenCL).

Author: LewisCrawford

llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp

@@ -1399,19 +1399,27 @@ void NVPTXAsmPrinter::emitFunctionParamList(const Function *F, raw_ostream &O) {
       if (PTy) {
         O << "\t.param .u" << PTySizeInBits << " .ptr";
 
+        bool IsCUDA = static_cast<NVPTXTargetMachine &>(TM).getDrvInterface() ==
+                      NVPTX::CUDA;
         switch (PTy->getAddressSpace()) {
         default:
           break;
         case ADDRESS_SPACE_GLOBAL:
           O << " .global";
           break;
         case ADDRESS_SPACE_SHARED:
+          if (IsCUDA)
+            report_fatal_error(".shared ptr kernel args unsupported in CUDA.");
           O << " .shared";
           break;
         case ADDRESS_SPACE_CONST:
+          if (IsCUDA)
+            report_fatal_error(".const ptr kernel args unsupported in CUDA.");
           O << " .const";
           break;
         case ADDRESS_SPACE_LOCAL:
+          if (IsCUDA)
+            report_fatal_error(".local ptr kernel args unsupported in CUDA.");
           O << " .local";
           break;
         }

llvm/test/CodeGen/NVPTX/kernel-param-align.ll

@@ -1,5 +1,6 @@
-; RUN: llc < %s -mtriple=nvptx64 -mcpu=sm_60 | FileCheck %s
-; RUN: %if ptxas %{ llc < %s -mtriple=nvptx64 -mcpu=sm_60 | %ptxas -arch=sm_60 - %}
+; RUN: llc < %s -mcpu=sm_60 | FileCheck %s
+; RUN: %if ptxas %{ llc < %s -mcpu=sm_60 | %ptxas -arch=sm_60 - %}
+target triple = "nvptx64-nvidia-nvcl"
 
 %struct.Large = type { [16 x double] }
 

llvm/test/CodeGen/NVPTX/lower-args-cuda.ll

@@ -0,0 +1,13 @@
+; RUN: not --crash llc < %s -mcpu=sm_75  -o /dev/null 2>&1 | FileCheck %s
+
+target datalayout = "e-i64:64-i128:128-v16:16-v32:32-n16:32:64"
+target triple = "nvptx64-nvidia-cuda"
+
+; Make sure we exit with an error message for this input, as pointers to the
+; shared address-space are only supported as kernel args in NVCL, not CUDA.
+; CHECK:  .shared ptr kernel args unsupported in CUDA.
+define ptx_kernel void @ptr_nongeneric(ptr addrspace(1) %out, ptr addrspace(3) %in) {
+  %v = load i32, ptr addrspace(3) %in, align 4
+  store i32 %v, ptr addrspace(1) %out, align 4
+  ret void
+}

llvm/test/CodeGen/NVPTX/lower-args-nvcl.ll

@@ -0,0 +1,17 @@
+; RUN: opt < %s -S -nvptx-lower-args | FileCheck %s --check-prefixes COMMON,IR
+; RUN: llc < %s -mcpu=sm_20 | FileCheck %s --check-prefixes COMMON,PTX
+; RUN: %if ptxas %{ llc < %s -mcpu=sm_20 | %ptxas-verify %}
+
+target datalayout = "e-i64:64-i128:128-v16:16-v32:32-n16:32:64"
+target triple = "nvptx64-nvidia-nvcl"
+
+; COMMON-LABEL: ptr_nongeneric
+define ptx_kernel void @ptr_nongeneric(ptr addrspace(1) %out, ptr addrspace(3) %in) {
+; IR-NOT: addrspacecast
+; PTX-NOT: cvta.to.global
+; PTX:  ld.shared.u32
+; PTX   st.global.u32
+  %v = load i32, ptr addrspace(3) %in, align 4
+  store i32 %v, ptr addrspace(1) %out, align 4
+  ret void
+}

llvm/test/CodeGen/NVPTX/lower-args.ll

@@ -140,29 +140,6 @@ define ptx_kernel void @ptr_generic(ptr %out, ptr %in) {
   ret void
 }
 
-define ptx_kernel void @ptr_nongeneric(ptr addrspace(1) %out, ptr addrspace(3) %in) {
-; IR-LABEL: define ptx_kernel void @ptr_nongeneric(
-; IR-SAME: ptr addrspace(1) [[OUT:%.*]], ptr addrspace(3) [[IN:%.*]]) {
-; IR-NEXT:    [[V:%.*]] = load i32, ptr addrspace(3) [[IN]], align 4
-; IR-NEXT:    store i32 [[V]], ptr addrspace(1) [[OUT]], align 4
-; IR-NEXT:    ret void
-;
-; PTX-LABEL: ptr_nongeneric(
-; PTX:       {
-; PTX-NEXT:    .reg .b32 %r<2>;
-; PTX-NEXT:    .reg .b64 %rd<3>;
-; PTX-EMPTY:
-; PTX-NEXT:  // %bb.0:
-; PTX-NEXT:    ld.param.b64 %rd1, [ptr_nongeneric_param_0];
-; PTX-NEXT:    ld.param.b64 %rd2, [ptr_nongeneric_param_1];
-; PTX-NEXT:    ld.shared.b32 %r1, [%rd2];
-; PTX-NEXT:    st.global.b32 [%rd1], %r1;
-; PTX-NEXT:    ret;
-  %v = load i32, ptr addrspace(3) %in, align 4
-  store i32 %v, ptr addrspace(1) %out, align 4
-  ret void
-}
-
 define ptx_kernel void @ptr_as_int(i64 noundef %i, i32 noundef %v) {
 ; IRC-LABEL: define ptx_kernel void @ptr_as_int(
 ; IRC-SAME: i64 noundef [[I:%.*]], i32 noundef [[V:%.*]]) {