1 ; RUN: llc -march=amdgcn < %s | FileCheck --check-prefixes=GCN,GCN-FMF,GCN-SAFE %s
3 declare i32 @llvm.amdgcn.workitem.id.x() nounwind readnone
5 ; Test that the -enable-no-signed-zeros-fp-math flag works
7 ; GCN-LABEL: {{^}}fneg_fsub_f32_fmf:
8 ; GCN: v_sub_f32_e32 [[SUB:v[0-9]+]], {{v[0-9]+}}, {{v[0-9]+}}
10 define amdgpu_kernel void @fneg_fsub_f32_fmf(float addrspace(1)* %out, float addrspace(1)* %in) #0 {
11 %tid = call i32 @llvm.amdgcn.workitem.id.x()
12 %add = add i32 %tid, 1
13 %gep = getelementptr float, float addrspace(1)* %in, i32 %tid
14 %b_ptr = getelementptr float, float addrspace(1)* %in, i32 %add
15 %a = load float, float addrspace(1)* %gep, align 4
16 %b = load float, float addrspace(1)* %b_ptr, align 4
17 %result = fsub fast float %a, %b
18 %neg.result = fsub fast float -0.0, %result
19 store float %neg.result, float addrspace(1)* %out, align 4
23 ; GCN-LABEL: {{^}}fneg_fsub_f32_safe:
24 ; GCN: v_sub_f32_e32 [[SUB:v[0-9]+]], {{v[0-9]+}}, {{v[0-9]+}}
25 ; GCN-SAFE: v_xor_b32_e32 v{{[0-9]+}}, 0x80000000, [[SUB]]
26 define amdgpu_kernel void @fneg_fsub_f32_safe(float addrspace(1)* %out, float addrspace(1)* %in) #0 {
27 %tid = call i32 @llvm.amdgcn.workitem.id.x()
28 %add = add i32 %tid, 1
29 %gep = getelementptr float, float addrspace(1)* %in, i32 %tid
30 %b_ptr = getelementptr float, float addrspace(1)* %in, i32 %add
31 %a = load float, float addrspace(1)* %gep, align 4
32 %b = load float, float addrspace(1)* %b_ptr, align 4
33 %result = fsub float %a, %b
34 %neg.result = fsub float -0.0, %result
35 store float %neg.result, float addrspace(1)* %out, align 4
39 attributes #0 = { nounwind }