; RUN: llc -march=amdgcn -mcpu=tahiti -verify-machineinstrs -amdgpu-s-branch-bits=4 -simplifycfg-require-and-preserve-domtree=1 < %s | FileCheck -enable-var-scope -check-prefix=GCN %s ; FIXME: We should use llvm-mc for this, but we can't even parse our own output. ; See PR33579. ; RUN: llc -march=amdgcn -verify-machineinstrs -amdgpu-s-branch-bits=4 -o %t.o -filetype=obj -simplifycfg-require-and-preserve-domtree=1 %s ; RUN: llvm-readobj -r %t.o | FileCheck --check-prefix=OBJ %s ; OBJ: Relocations [ ; OBJ-NEXT: ] ; Restrict maximum branch to between +7 and -8 dwords ; Used to emit an always 4 byte instruction. Inline asm always assumes ; each instruction is the maximum size. declare void @llvm.amdgcn.s.sleep(i32) #0 declare i32 @llvm.amdgcn.workitem.id.x() #1 ; GCN-LABEL: {{^}}uniform_conditional_max_short_forward_branch: ; GCN: s_load_dword [[CND:s[0-9]+]] ; GCN: s_cmp_eq_u32 [[CND]], 0 ; GCN-NEXT: s_cbranch_scc1 [[BB3:BB[0-9]+_[0-9]+]] ; GCN-NEXT: ; %bb.1: ; %bb2 ; GCN-NEXT: ;;#ASMSTART ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: ;;#ASMEND ; GCN-NEXT: s_sleep 0 ; GCN-NEXT: [[BB3]]: ; %bb3 ; GCN: v_mov_b32_e32 [[V_CND:v[0-9]+]], [[CND]] ; GCN: buffer_store_dword [[V_CND]] ; GCN: s_endpgm define amdgpu_kernel void @uniform_conditional_max_short_forward_branch(i32 addrspace(1)* %arg, i32 %cnd) #0 { bb: %cmp = icmp eq i32 %cnd, 0 br i1 %cmp, label %bb3, label %bb2 ; +8 dword branch bb2: ; 24 bytes call void asm sideeffect "v_nop_e64 v_nop_e64 v_nop_e64", ""() #0 call void @llvm.amdgcn.s.sleep(i32 0) br label %bb3 bb3: store volatile i32 %cnd, i32 addrspace(1)* %arg ret void } ; GCN-LABEL: {{^}}uniform_conditional_min_long_forward_branch: ; GCN: s_load_dword [[CND:s[0-9]+]] ; GCN: s_cmp_eq_u32 [[CND]], 0 ; GCN-NEXT: s_cbranch_scc0 [[LONGBB:BB[0-9]+_[0-9]+]] ; GCN-NEXT: [[LONG_JUMP:BB[0-9]+_[0-9]+]]: ; %bb0 ; GCN-NEXT: s_getpc_b64 s{{\[}}[[PC_LO:[0-9]+]]:[[PC_HI:[0-9]+]]{{\]}} ; GCN-NEXT: s_add_u32 s[[PC_LO]], s[[PC_LO]], [[ENDBB:BB[0-9]+_[0-9]+]]-([[LONG_JUMP]]+4) ; GCN-NEXT: s_addc_u32 s[[PC_HI]], s[[PC_HI]], 0 ; GCN-NEXT: s_setpc_b64 s{{\[}}[[PC_LO]]:[[PC_HI]]{{\]}} ; GCN-NEXT: [[LONGBB]]: ; GCN-NEXT: ;;#ASMSTART ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN-NEXT: ;;#ASMEND ; GCN-NEXT: [[ENDBB]]: ; GCN: v_mov_b32_e32 [[V_CND:v[0-9]+]], [[CND]] ; GCN: buffer_store_dword [[V_CND]] ; GCN: s_endpgm define amdgpu_kernel void @uniform_conditional_min_long_forward_branch(i32 addrspace(1)* %arg, i32 %cnd) #0 { bb0: %cmp = icmp eq i32 %cnd, 0 br i1 %cmp, label %bb3, label %bb2 ; +9 dword branch bb2: ; 32 bytes call void asm sideeffect "v_nop_e64 v_nop_e64 v_nop_e64 v_nop_e64", ""() #0 br label %bb3 bb3: store volatile i32 %cnd, i32 addrspace(1)* %arg ret void } ; GCN-LABEL: {{^}}uniform_conditional_min_long_forward_vcnd_branch: ; GCN: s_load_dword [[CND:s[0-9]+]] ; GCN-DAG: v_cmp_eq_f32_e64 [[UNMASKED:s\[[0-9]+:[0-9]+\]]], [[CND]], 0 ; GCN-DAG: s_and_b64 vcc, exec, [[UNMASKED]] ; GCN: s_cbranch_vccz [[LONGBB:BB[0-9]+_[0-9]+]] ; GCN-NEXT: [[LONG_JUMP:BB[0-9]+_[0-9]+]]: ; %bb0 ; GCN-NEXT: s_getpc_b64 s{{\[}}[[PC_LO:[0-9]+]]:[[PC_HI:[0-9]+]]{{\]}} ; GCN-NEXT: s_add_u32 s[[PC_LO]], s[[PC_LO]], [[ENDBB:BB[0-9]+_[0-9]+]]-([[LONG_JUMP]]+4) ; GCN-NEXT: s_addc_u32 s[[PC_HI]], s[[PC_HI]], 0 ; GCN-NEXT: s_setpc_b64 s{{\[}}[[PC_LO]]:[[PC_HI]]{{\]}} ; GCN-NEXT: [[LONGBB]]: ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: [[ENDBB]]: ; GCN: v_mov_b32_e32 [[V_CND:v[0-9]+]], [[CND]] ; GCN: buffer_store_dword [[V_CND]] ; GCN: s_endpgm define amdgpu_kernel void @uniform_conditional_min_long_forward_vcnd_branch(float addrspace(1)* %arg, float %cnd) #0 { bb0: %cmp = fcmp oeq float %cnd, 0.0 br i1 %cmp, label %bb3, label %bb2 ; + 8 dword branch bb2: call void asm sideeffect " ; 32 bytes v_nop_e64 v_nop_e64 v_nop_e64 v_nop_e64", ""() #0 br label %bb3 bb3: store volatile float %cnd, float addrspace(1)* %arg ret void } ; GCN-LABEL: {{^}}min_long_forward_vbranch: ; GCN: buffer_load_dword ; GCN: v_cmp_ne_u32_e32 vcc, 0, v{{[0-9]+}} ; GCN: s_and_saveexec_b64 [[SAVE:s\[[0-9]+:[0-9]+\]]], vcc ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: s_or_b64 exec, exec, [[SAVE]] ; GCN: buffer_store_dword ; GCN: s_endpgm define amdgpu_kernel void @min_long_forward_vbranch(i32 addrspace(1)* %arg) #0 { bb: %tid = call i32 @llvm.amdgcn.workitem.id.x() %tid.ext = zext i32 %tid to i64 %gep = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tid.ext %load = load volatile i32, i32 addrspace(1)* %gep %cmp = icmp eq i32 %load, 0 br i1 %cmp, label %bb3, label %bb2 ; + 8 dword branch bb2: call void asm sideeffect " ; 32 bytes v_nop_e64 v_nop_e64 v_nop_e64 v_nop_e64", ""() #0 br label %bb3 bb3: store volatile i32 %load, i32 addrspace(1)* %gep ret void } ; GCN-LABEL: {{^}}long_backward_sbranch: ; GCN: s_mov_b32 [[LOOPIDX:s[0-9]+]], 0{{$}} ; GCN: [[LOOPBB:BB[0-9]+_[0-9]+]]: ; %bb2 ; GCN-NEXT: ; =>This Inner Loop Header: Depth=1 ; GCN-NEXT: s_add_i32 [[INC:s[0-9]+]], [[LOOPIDX]], 1 ; GCN-NEXT: s_cmp_lt_i32 [[INC]], 10 ; GCN-NEXT: ;;#ASMSTART ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: ;;#ASMEND ; GCN-NEXT: s_cbranch_scc0 [[ENDBB:BB[0-9]+_[0-9]+]] ; GCN-NEXT: [[LONG_JUMP:BB[0-9]+_[0-9]+]]: ; %bb2 ; GCN-NEXT: ; in Loop: Header=[[LOOPBB]] Depth=1 ; GCN-NEXT: s_getpc_b64 s{{\[}}[[PC_LO:[0-9]+]]:[[PC_HI:[0-9]+]]{{\]}} ; GCN-NEXT: s_sub_u32 s[[PC_LO]], s[[PC_LO]], ([[LONG_JUMP]]+4)-[[LOOPBB]] ; GCN-NEXT: s_subb_u32 s[[PC_HI]], s[[PC_HI]], 0 ; GCN-NEXT: s_setpc_b64 s{{\[}}[[PC_LO]]:[[PC_HI]]{{\]}} ; GCN-NEXT: [[ENDBB]]: ; GCN-NEXT: s_endpgm define amdgpu_kernel void @long_backward_sbranch(i32 addrspace(1)* %arg) #0 { bb: br label %bb2 bb2: %loop.idx = phi i32 [ 0, %bb ], [ %inc, %bb2 ] ; 24 bytes call void asm sideeffect "v_nop_e64 v_nop_e64 v_nop_e64", ""() #0 %inc = add nsw i32 %loop.idx, 1 ; add cost 4 %cmp = icmp slt i32 %inc, 10 ; condition cost = 8 br i1 %cmp, label %bb2, label %bb3 ; - bb3: ret void } ; Requires expansion of unconditional branch from %bb2 to %bb4 (and ; expansion of conditional branch from %bb to %bb3. ; GCN-LABEL: {{^}}uniform_unconditional_min_long_forward_branch: ; GCN: s_cmp_eq_u32 ; GCN: s_cbranch_scc{{[0-1]}} [[BB2:BB[0-9]+_[0-9]+]] ; GCN-NEXT: [[LONG_JUMP0:BB[0-9]+_[0-9]+]]: ; %bb0 ; GCN-NEXT: s_getpc_b64 s{{\[}}[[PC0_LO:[0-9]+]]:[[PC0_HI:[0-9]+]]{{\]}} ; GCN-NEXT: s_add_u32 s[[PC0_LO]], s[[PC0_LO]], [[BB3:BB[0-9]_[0-9]+]]-([[LONG_JUMP0]]+4) ; GCN-NEXT: s_addc_u32 s[[PC0_HI]], s[[PC0_HI]], 0{{$}} ; GCN-NEXT: s_setpc_b64 s{{\[}}[[PC0_LO]]:[[PC0_HI]]{{\]}} ; GCN: [[BB2]]: ; %bb3 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: ;;#ASMEND ; GCN: [[BB3]]: ; GCN: v_mov_b32_e32 [[BB2_K:v[0-9]+]], 17 ; GCN: buffer_store_dword [[BB2_K]] ; GCN: v_mov_b32_e32 [[BB4_K:v[0-9]+]], 63 ; GCN: buffer_store_dword [[BB4_K]] ; GCN: s_endpgm ; GCN-NEXT: .Lfunc_end{{[0-9]+}}: define amdgpu_kernel void @uniform_unconditional_min_long_forward_branch(i32 addrspace(1)* %arg, i32 %arg1) { bb0: %tmp = icmp ne i32 %arg1, 0 br i1 %tmp, label %bb2, label %bb3 bb2: store volatile i32 17, i32 addrspace(1)* undef br label %bb4 bb3: ; 32 byte asm call void asm sideeffect "v_nop_e64 v_nop_e64 v_nop_e64 v_nop_e64", ""() #0 br label %bb4 bb4: store volatile i32 63, i32 addrspace(1)* %arg ret void } ; GCN-LABEL: {{^}}uniform_unconditional_min_long_backward_branch: ; GCN-NEXT: ; %bb.0: ; %entry ; GCN-NEXT: [[LOOP:BB[0-9]_[0-9]+]]: ; %loop ; GCN-NEXT: ; =>This Inner Loop Header: Depth=1 ; GCN-NEXT: ;;#ASMSTART ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: ;;#ASMEND ; GCN-NEXT: [[LONGBB:BB[0-9]+_[0-9]+]]: ; %loop ; GCN-NEXT: ; in Loop: Header=[[LOOP]] Depth=1 ; GCN-NEXT: s_getpc_b64 s{{\[}}[[PC_LO:[0-9]+]]:[[PC_HI:[0-9]+]]{{\]}} ; GCN-NEXT: s_sub_u32 s[[PC_LO]], s[[PC_LO]], ([[LONGBB]]+4)-[[LOOP]] ; GCN-NEXT: s_subb_u32 s[[PC_HI]], s[[PC_HI]], 0{{$}} ; GCN-NEXT: s_setpc_b64 s{{\[}}[[PC_LO]]:[[PC_HI]]{{\]}} ; GCN-NEXT: .Lfunc_end{{[0-9]+}}: define amdgpu_kernel void @uniform_unconditional_min_long_backward_branch(i32 addrspace(1)* %arg, i32 %arg1) { entry: br label %loop loop: ; 32 byte asm call void asm sideeffect "v_nop_e64 v_nop_e64 v_nop_e64 v_nop_e64", ""() #0 br label %loop } ; Expansion of branch from %bb1 to %bb3 introduces need to expand ; branch from %bb0 to %bb2 ; GCN-LABEL: {{^}}expand_requires_expand: ; GCN-NEXT: ; %bb.0: ; %bb0 ; GCN: s_load_dword ; GCN: {{s|v}}_cmp_lt_i32 ; GCN: s_cbranch ; GCN: s_load_dword ; GCN-NEXT: s_waitcnt lgkmcnt(0) ; GCN-NEXT: v_cmp_{{eq|ne}}_u32_e64 ; GCN: s_cbranch_vccz [[BB2:BB[0-9]_[0-9]+]] ; GCN-NEXT: [[LONGBB1:BB[0-9]+_[0-9]+]]: ; GCN-NEXT: s_getpc_b64 s{{\[}}[[PC1_LO:[0-9]+]]:[[PC1_HI:[0-9]+]]{{\]}} ; GCN-NEXT: s_add_u32 s[[PC1_LO]], s[[PC1_LO]], [[BB3:BB[0-9]+_[0-9]+]]-([[LONGBB1]]+4) ; GCN-NEXT: s_addc_u32 s[[PC1_HI]], s[[PC1_HI]], 0{{$}} ; GCN-NEXT: s_setpc_b64 s{{\[}}[[PC1_LO]]:[[PC1_HI]]{{\]}} ; GCN-NEXT: [[BB2]]: ; %bb2 ; GCN-NEXT: ;;#ASMSTART ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: ;;#ASMEND ; GCN-NEXT: [[BB3]]: ; %bb3 ; GCN-NEXT: ;;#ASMSTART ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: ;;#ASMEND ; GCN-NEXT: ;;#ASMSTART ; GCN-NEXT: v_nop_e64 ; GCN-NEXT: ;;#ASMEND ; GCN-NEXT: s_endpgm define amdgpu_kernel void @expand_requires_expand(i32 %cond0) #0 { bb0: %tmp = tail call i32 @llvm.amdgcn.workitem.id.x() #0 %cmp0 = icmp slt i32 %cond0, 0 br i1 %cmp0, label %bb2, label %bb1 bb1: %val = load volatile i32, i32 addrspace(4)* undef %cmp1 = icmp eq i32 %val, 3 br i1 %cmp1, label %bb3, label %bb2 bb2: call void asm sideeffect "v_nop_e64 v_nop_e64 v_nop_e64 v_nop_e64", ""() #0 br label %bb3 bb3: ; These NOPs prevent tail-duplication-based outlining ; from firing, which defeats the need to expand the branches and this test. call void asm sideeffect "v_nop_e64", ""() #0 call void asm sideeffect "v_nop_e64", ""() #0 ret void } ; Requires expanding of required skip branch. ; GCN-LABEL: {{^}}uniform_inside_divergent: ; GCN: v_cmp_gt_u32_e32 vcc, 16, v{{[0-9]+}} ; GCN-NEXT: s_and_saveexec_b64 [[MASK:s\[[0-9]+:[0-9]+\]]], vcc ; GCN-NEXT: s_cbranch_execnz [[IF:BB[0-9]+_[0-9]+]] ; GCN-NEXT: [[LONGBB:BB[0-9]+_[0-9]+]]: ; %entry ; GCN-NEXT: s_getpc_b64 s{{\[}}[[PC_LO:[0-9]+]]:[[PC_HI:[0-9]+]]{{\]}} ; GCN-NEXT: s_add_u32 s[[PC_LO]], s[[PC_LO]], [[BB2:BB[0-9]_[0-9]+]]-([[LONGBB]]+4) ; GCN-NEXT: s_addc_u32 s[[PC_HI]], s[[PC_HI]], 0{{$}} ; GCN-NEXT: s_setpc_b64 s{{\[}}[[PC_LO]]:[[PC_HI]]{{\]}} ; GCN-NEXT: [[IF]]: ; %if ; GCN: buffer_store_dword ; GCN: s_cmp_lg_u32 ; GCN: s_cbranch_scc1 [[ENDIF:BB[0-9]+_[0-9]+]] ; GCN-NEXT: ; %bb.2: ; %if_uniform ; GCN: buffer_store_dword ; GCN-NEXT: [[ENDIF]]: ; %endif ; GCN-NEXT: s_or_b64 exec, exec, [[MASK]] ; GCN-NEXT: s_sleep 5 ; GCN-NEXT: s_endpgm define amdgpu_kernel void @uniform_inside_divergent(i32 addrspace(1)* %out, i32 %cond) #0 { entry: %tid = call i32 @llvm.amdgcn.workitem.id.x() %d_cmp = icmp ult i32 %tid, 16 br i1 %d_cmp, label %if, label %endif if: store i32 0, i32 addrspace(1)* %out %u_cmp = icmp eq i32 %cond, 0 br i1 %u_cmp, label %if_uniform, label %endif if_uniform: store i32 1, i32 addrspace(1)* %out br label %endif endif: ; layout can remove the split branch if it can copy the return block. ; This call makes the return block long enough that it doesn't get copied. call void @llvm.amdgcn.s.sleep(i32 5); ret void } ; si_mask_branch ; GCN-LABEL: {{^}}analyze_mask_branch: ; GCN: v_cmp_nlt_f32_e32 vcc ; GCN-NEXT: s_and_saveexec_b64 [[TEMP_MASK:s\[[0-9]+:[0-9]+\]]], vcc ; GCN-NEXT: s_xor_b64 [[MASK:s\[[0-9]+:[0-9]+\]]], exec, [[TEMP_MASK]] ; GCN: BB{{[0-9]+_[0-9]+}}: ; %Flow ; GCN-NEXT: s_or_saveexec_b64 [[TEMP_MASK1:s\[[0-9]+:[0-9]+\]]], [[MASK]] ; GCN-NEXT: s_xor_b64 exec, exec, [[TEMP_MASK1]] ; GCN: [[LOOP_BODY:BB[0-9]+_[0-9]+]]: ; %loop{{$}} ; GCN: ;;#ASMSTART ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: v_nop_e64 ; GCN: ;;#ASMEND ; GCN: s_cbranch_{{vccz|vccnz}} [[RET:BB[0-9]+_[0-9]+]] ; GCN-NEXT: [[LONGBB:BB[0-9]+_[0-9]+]]: ; %loop ; GCN-NEXT: ; in Loop: Header=[[LOOP_BODY]] Depth=1 ; GCN-NEXT: s_getpc_b64 s{{\[}}[[PC_LO:[0-9]+]]:[[PC_HI:[0-9]+]]{{\]}} ; GCN-NEXT: s_sub_u32 s[[PC_LO]], s[[PC_LO]], ([[LONGBB]]+4)-[[LOOP_BODY]] ; GCN-NEXT: s_subb_u32 s[[PC_HI]], s[[PC_HI]], 0 ; GCN-NEXT: s_setpc_b64 s{{\[}}[[PC_LO]]:[[PC_HI]]{{\]}} ; GCN-NEXT: [[RET]]: ; %UnifiedReturnBlock ; GCN-NEXT: s_endpgm define amdgpu_kernel void @analyze_mask_branch() #0 { entry: %reg = call float asm sideeffect "v_mov_b32_e64 $0, 0", "=v"() %cmp0 = fcmp ogt float %reg, 0.000000e+00 br i1 %cmp0, label %loop, label %ret loop: %phi = phi float [ 0.000000e+00, %loop_body ], [ 1.000000e+00, %entry ] call void asm sideeffect "v_nop_e64 v_nop_e64", ""() #0 %cmp1 = fcmp olt float %phi, 8.0 br i1 %cmp1, label %loop_body, label %ret loop_body: call void asm sideeffect "v_nop_e64 v_nop_e64 v_nop_e64 v_nop_e64", ""() #0 br label %loop ret: store volatile i32 7, i32 addrspace(1)* undef ret void } ; GCN-LABEL: {{^}}long_branch_hang: ; GCN: s_cmp_lt_i32 s{{[0-9]+}}, 6 ; GCN: s_cbranch_scc{{[0-1]}} [[LONG_BR_0:BB[0-9]+_[0-9]+]] ; GCN-NEXT: BB{{[0-9]+_[0-9]+}}: ; GCN: s_add_u32 s{{[0-9]+}}, s{{[0-9]+}}, [[LONG_BR_DEST0:BB[0-9]+_[0-9]+]]-( ; GCN-NEXT: s_addc_u32 ; GCN-NEXT: s_setpc_b64 ; GCN-NEXT: [[LONG_BR_0]]: ; GCN: [[LONG_BR_DEST0]]: ; GCN-DAG: v_cmp_lt_i32 ; GCN-DAG: v_cmp_ge_i32 ; GCN: s_cbranch_vccz ; GCN: s_setpc_b64 ; GCN: s_endpgm define amdgpu_kernel void @long_branch_hang(i32 addrspace(1)* nocapture %arg, i32 %arg1, i32 %arg2, i32 %arg3, i32 %arg4, i64 %arg5) #0 { bb: %tmp = icmp slt i32 %arg2, 9 %tmp6 = icmp eq i32 %arg1, 0 %tmp7 = icmp sgt i32 %arg4, 0 %tmp8 = icmp sgt i32 %arg4, 5 br i1 %tmp8, label %bb9, label %bb13 bb9: ; preds = %bb %tmp10 = and i1 %tmp7, %tmp %tmp11 = icmp slt i32 %arg3, %arg4 %tmp12 = or i1 %tmp11, %tmp7 br i1 %tmp12, label %bb19, label %bb14 bb13: ; preds = %bb call void asm sideeffect "v_nop_e64 v_nop_e64 v_nop_e64 v_nop_e64", ""() #0 br i1 %tmp6, label %bb19, label %bb14 bb14: ; preds = %bb13, %bb9 %tmp15 = icmp slt i32 %arg3, %arg4 %tmp16 = or i1 %tmp15, %tmp %tmp17 = and i1 %tmp6, %tmp16 %tmp18 = zext i1 %tmp17 to i32 br label %bb19 bb19: ; preds = %bb14, %bb13, %bb9 %tmp20 = phi i32 [ undef, %bb9 ], [ undef, %bb13 ], [ %tmp18, %bb14 ] %tmp21 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %arg5 store i32 %tmp20, i32 addrspace(1)* %tmp21, align 4 ret void } attributes #0 = { nounwind } attributes #1 = { nounwind readnone }