AMDGPU: Add some tests for exotic denormal mode combinations

[rampitec]

LGTM

[arsenm]

192cccb15222ec7dc8d23872f44889304c2d94a7

llvm/test/CodeGen/AMDGPU/default-fp-mode.ll

 ; GCN: FloatMode: 192
 ; GCN: IeeeMode: 1
 define amdgpu_kernel void @test_just_f32_attr_flush(float addrspace(1)* %out0, double addrspace(1)* %out1) #9 {
   store float 0.0, float addrspace(1)* %out0
   store double 0.0, double addrspace(1)* %out1
   ret void
 }
 
+; GCN-LABEL: {{^}}test_flush_all_outputs:
+; GCN: FloatMode: 80
+; GCN: IeeeMode: 1
+define amdgpu_kernel void @test_flush_all_outputs(float addrspace(1)* %out0, double addrspace(1)* %out1) #10 {
+  store float 0.0, float addrspace(1)* %out0
+  store double 0.0, double addrspace(1)* %out1
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_flush_all_inputs:
+; GCN: FloatMode: 160
+; GCN: IeeeMode: 1
+define amdgpu_kernel void @test_flush_all_inputs(float addrspace(1)* %out0, double addrspace(1)* %out1) #11 {
+  store float 0.0, float addrspace(1)* %out0
+  store double 0.0, double addrspace(1)* %out1
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_flush_f32_inputs:
+; GCN: FloatMode: 224
+; GCN: IeeeMode: 1
+define amdgpu_kernel void @test_flush_f32_inputs(float addrspace(1)* %out0, double addrspace(1)* %out1) #12 {
+  store float 0.0, float addrspace(1)* %out0
+  store double 0.0, double addrspace(1)* %out1
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_flush_f32_outputs:
+; GCN: FloatMode: 208
+; GCN: IeeeMode: 1
+define amdgpu_kernel void @test_flush_f32_outputs(float addrspace(1)* %out0, double addrspace(1)* %out1) #13 {
+  store float 0.0, float addrspace(1)* %out0
+  store double 0.0, double addrspace(1)* %out1
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_flush_f64_inputs:
+; GCN: FloatMode: 176
+; GCN: IeeeMode: 1
+define amdgpu_kernel void @test_flush_f64_inputs(float addrspace(1)* %out0, double addrspace(1)* %out1) #14 {
+  store float 0.0, float addrspace(1)* %out0
+  store double 0.0, double addrspace(1)* %out1
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_flush_f64_outputs:
+; GCN: FloatMode: 112
+; GCN: IeeeMode: 1
+define amdgpu_kernel void @test_flush_f64_outputs(float addrspace(1)* %out0, double addrspace(1)* %out1) #15 {
+  store float 0.0, float addrspace(1)* %out0
+  store double 0.0, double addrspace(1)* %out1
+  ret void
+}
+
 ; GCN-LABEL: {{^}}kill_gs_const:
 ; GCN: FloatMode: 192
 ; GCN: IeeeMode: 0
 define amdgpu_gs void @kill_gs_const() {
 main_body:
   %cmp0 = icmp ule i32 0, 3
   call void @llvm.amdgcn.kill(i1 %cmp0)
   %cmp1 = icmp ule i32 3, 0

 attributes #2 = { nounwind "denormal-fp-math"="ieee,ieee" }
 attributes #3 = { nounwind "denormal-fp-math-f32"="ieee,ieee" }
 attributes #4 = { nounwind "denormal-fp-math"="ieee,ieee" }
 attributes #5 = { nounwind "denormal-fp-math"="preserve-sign,preserve-sign" }
 attributes #6 = { nounwind "denormal-fp-math"="ieee,ieee" }
 attributes #7 = { nounwind "denormal-fp-math-f32"="ieee,ieee" "denormal-fp-math"="preserve-sign,preserve-sign" }
 attributes #8 = { nounwind "denormal-fp-math"="ieee,ieee" }
 attributes #9 = { nounwind "denormal-fp-math-f32"="preserve-sign,preserve-sign" }
+attributes #10 = { nounwind "denormal-fp-math"="preserve-sign,ieee" }
+attributes #11 = { nounwind "denormal-fp-math"="ieee,preserve-sign" }
+attributes #12 = { nounwind "denormal-fp-math-f32"="ieee,preserve-sign" "denormal-fp-math"="ieee,ieee" }
+attributes #13 = { nounwind "denormal-fp-math-f32"="preserve-sign,ieee" "denormal-fp-math"="ieee,ieee" }
+attributes #14 = { nounwind "denormal-fp-math"="ieee,preserve-sign" "denormal-fp-math-f32"="ieee,ieee" }
+attributes #15 = { nounwind "denormal-fp-math"="preserve-sign,ieee" "denormal-fp-math-f32"="ieee,ieee" }