AMDGPU: Fix crash with dispatch.ptr intrinsic with non-HSA target

[arsenm]

Summary

It might be better to let this be a select failure instead.

[nhaehnle]

LGTM

[arsenm]

r257387

lib/Target/AMDGPU/SIISelLowering.cpp

SDValue SITargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
   EVT VT = Op.getValueType();
   SDLoc DL(Op);
   unsigned IntrinsicID = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
 
   // TODO: Should this propagate fast-math-flags?
 
   switch (IntrinsicID) {
   case Intrinsic::amdgcn_dispatch_ptr:
+    if (!Subtarget->isAmdHsaOS()) {
+      DiagnosticInfoUnsupported BadIntrin(*MF.getFunction(),
+                                          "hsa intrinsic without hsa target");
+      DAG.getContext()->diagnose(BadIntrin);
+      return DAG.getUNDEF(VT);
+    }
+
     return CreateLiveInRegister(DAG, &AMDGPU::SReg_64RegClass,
       TRI->getPreloadedValue(MF, SIRegisterInfo::DISPATCH_PTR), VT);
 
   case Intrinsic::r600_read_ngroups_x:
     return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
                           SI::KernelInputOffsets::NGROUPS_X, false);
   case Intrinsic::r600_read_ngroups_y:
     return LowerParameter(DAG, VT, VT, DL, DAG.getEntryNode(),

test/CodeGen/AMDGPU/llvm.amdgcn.dispatch.ptr.ll

 ; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=kaveri -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
+; RUN: not llc -mtriple=amdgcn-unknown-unknown -mcpu=kaveri -verify-machineinstrs < %s 2>&1 | FileCheck -check-prefix=ERROR %s
+
+; ERROR: error: unsupported hsa intrinsic without hsa target in test
 
 ; GCN-LABEL: {{^}}test:
 ; GCN: enable_sgpr_dispatch_ptr = 1
 ; GCN: s_load_dword s{{[0-9]+}}, s[4:5], 0x0
 define void @test(i32 addrspace(1)* %out) {
   %dispatch_ptr = call noalias i8 addrspace(2)* @llvm.amdgcn.dispatch.ptr() #0
   %header_ptr = bitcast i8 addrspace(2)* %dispatch_ptr to i32 addrspace(2)*
   %value = load i32, i32 addrspace(2)* %header_ptr
   store i32 %value, i32 addrspace(1)* %out
   ret void
 }
 
 declare noalias i8 addrspace(2)* @llvm.amdgcn.dispatch.ptr() #0
 
 attributes #0 = { readnone }