AMDGPU: Don't error on calls to null or undef
Calls to constants should probably be generally handled.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375356 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/AMDGPU/SIISelLowering.cpp b/lib/Target/AMDGPU/SIISelLowering.cpp
index d6362e6..80eb2be 100644
--- a/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -2688,6 +2688,15 @@
bool IsThisReturn = false;
MachineFunction &MF = DAG.getMachineFunction();
+ if (Callee.isUndef() || isNullConstant(Callee)) {
+ if (!CLI.IsTailCall) {
+ for (unsigned I = 0, E = CLI.Ins.size(); I != E; ++I)
+ InVals.push_back(DAG.getUNDEF(CLI.Ins[I].VT));
+ }
+
+ return Chain;
+ }
+
if (IsVarArg) {
return lowerUnhandledCall(CLI, InVals,
"unsupported call to variadic function ");
diff --git a/test/CodeGen/AMDGPU/call-constant.ll b/test/CodeGen/AMDGPU/call-constant.ll
new file mode 100644
index 0000000..19aadfc
--- /dev/null
+++ b/test/CodeGen/AMDGPU/call-constant.ll
@@ -0,0 +1,45 @@
+; RUN: llc -mtriple=amdgcn-amd-amdhsa < %s | FileCheck -check-prefix=GCN %s
+
+; FIXME: Emitting unnecessary flat_scratch setup
+
+; GCN-LABEL: {{^}}test_call_undef:
+; GCN: s_mov_b32 s8, s7
+; GCN: s_mov_b32 flat_scratch_lo, s5
+; GCN: s_add_u32 s4, s4, s8
+; GCN: s_lshr_b32
+; GCN: s_endpgm
+define amdgpu_kernel void @test_call_undef() #0 {
+ %val = call i32 undef(i32 1)
+ %op = add i32 %val, 1
+ store volatile i32 %op, i32 addrspace(1)* undef
+ ret void
+}
+
+; GCN-LABEL: {{^}}test_tail_call_undef:
+; GCN: s_waitcnt
+; GCN-NEXT: .Lfunc_end
+define i32 @test_tail_call_undef() #0 {
+ %call = tail call i32 undef(i32 1)
+ ret i32 %call
+}
+
+; GCN-LABEL: {{^}}test_call_null:
+; GCN: s_mov_b32 s8, s7
+; GCN: s_mov_b32 flat_scratch_lo, s5
+; GCN: s_add_u32 s4, s4, s8
+; GCN: s_lshr_b32
+; GCN: s_endpgm
+define amdgpu_kernel void @test_call_null() #0 {
+ %val = call i32 null(i32 1)
+ %op = add i32 %val, 1
+ store volatile i32 %op, i32 addrspace(1)* null
+ ret void
+}
+
+; GCN-LABEL: {{^}}test_tail_call_null:
+; GCN: s_waitcnt
+; GCN-NEXT: .Lfunc_end
+define i32 @test_tail_call_null() #0 {
+ %call = tail call i32 null(i32 1)
+ ret i32 %call
+}
diff --git a/test/CodeGen/AMDGPU/unsupported-calls.ll b/test/CodeGen/AMDGPU/unsupported-calls.ll
index 303a0d6..3cff627 100644
--- a/test/CodeGen/AMDGPU/unsupported-calls.ll
+++ b/test/CodeGen/AMDGPU/unsupported-calls.ll
@@ -74,3 +74,13 @@
%call = call i32 @defined_function(i32 0)
ret i32 %call
}
+
+; FIXME: Bad error message
+; GCN: error: <unknown>:0:0: in function test_call_absolute void (): unsupported indirect call to function <unknown>
+; R600: error: <unknown>:0:0: in function test_call_absolute void (): unsupported call to function <unknown>
+define amdgpu_kernel void @test_call_absolute() #0 {
+ %val = call i32 inttoptr (i64 1234 to i32(i32)*) (i32 1)
+ %op = add i32 %val, 1
+ store volatile i32 %op, i32 addrspace(1)* undef
+ ret void
+}
