[llvm] r335829 - AMDGPU: Error on calls from graphics shaders

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Thu Jun 28 03:18:36 2018
New Revision: 335829

URL: http://llvm.org/viewvc/llvm-project?rev=335829&view=rev
Log:
AMDGPU: Error on calls from graphics shaders

In principle nothing should stop these from working, but
work is necessary to create an ABI for dealing with the stack
related registers.

Modified:
    llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp
    llvm/trunk/test/CodeGen/AMDGPU/unsupported-calls.ll

Modified: llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp?rev=335829&r1=335828&r2=335829&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp Thu Jun 28 03:18:36 2018
@@ -2310,6 +2310,13 @@ SDValue SITargetLowering::LowerCall(Call
                               "unsupported required tail call to function ");
   }
 
+  if (AMDGPU::isShader(MF.getFunction().getCallingConv())) {
+    // Note the issue is with the CC of the calling function, not of the call
+    // itself.
+    return lowerUnhandledCall(CLI, InVals,
+                          "unsupported call from graphics shader of function ");
+  }
+
   // The first 4 bytes are reserved for the callee's emergency stack slot.
   const unsigned CalleeUsableStackOffset = 4;
 

Modified: llvm/trunk/test/CodeGen/AMDGPU/unsupported-calls.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AMDGPU/unsupported-calls.ll?rev=335829&r1=335828&r2=335829&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/AMDGPU/unsupported-calls.ll (original)
+++ llvm/trunk/test/CodeGen/AMDGPU/unsupported-calls.ll Thu Jun 28 03:18:36 2018
@@ -67,3 +67,10 @@ define void @test_indirect_call(void()*
   call void %fptr()
   ret void
 }
+
+; GCN: :0:0: in function test_call_from_shader i32 (): unsupported call from graphics shader of function defined_function
+; R600: in function test_call{{.*}}: unsupported call to function defined_function
+define amdgpu_ps i32 @test_call_from_shader() {
+  %call = call i32 @defined_function(i32 0)
+  ret i32 %call
+}