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[AMDGPU] Mark cluster_workgroup_id_* intrinsics always uniform #159439

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Merged
merged 1 commit into from
Sep 17, 2025
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[AMDGPU] Mark cluster_workgroup_id_* intrinsics always uniform #159439

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8 changes: 8 additions & 0 deletions llvm/lib/Target/AMDGPU/AMDGPUSearchableTables.td
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Original file line number Diff line number Diff line change
Expand Up @@ -398,6 +398,14 @@ def : AlwaysUniform<int_amdgcn_icmp>;
def : AlwaysUniform<int_amdgcn_fcmp>;
def : AlwaysUniform<int_amdgcn_ballot>;
def : AlwaysUniform<int_amdgcn_if_break>;
def : AlwaysUniform<int_amdgcn_cluster_workgroup_id_x>;
def : AlwaysUniform<int_amdgcn_cluster_workgroup_id_y>;
def : AlwaysUniform<int_amdgcn_cluster_workgroup_id_z>;
def : AlwaysUniform<int_amdgcn_cluster_workgroup_flat_id>;
def : AlwaysUniform<int_amdgcn_cluster_workgroup_max_id_x>;
def : AlwaysUniform<int_amdgcn_cluster_workgroup_max_id_y>;
def : AlwaysUniform<int_amdgcn_cluster_workgroup_max_id_z>;
def : AlwaysUniform<int_amdgcn_cluster_workgroup_max_flat_id>;
def : AlwaysUniform<int_amdgcn_workgroup_id_x>;
def : AlwaysUniform<int_amdgcn_workgroup_id_y>;
def : AlwaysUniform<int_amdgcn_workgroup_id_z>;
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72 changes: 72 additions & 0 deletions llvm/test/Analysis/UniformityAnalysis/AMDGPU/always_uniform.ll
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Expand Up @@ -119,6 +119,70 @@ define void @s_getreg(ptr addrspace(1) inreg %out) {
ret void
}

; CHECK-LABEL: for function 'cluster_workgroup_id_x':
; CHECK: ALL VALUES UNIFORM
define void @cluster_workgroup_id_x(ptr addrspace(1) inreg %out) {
%result = call i32 @llvm.amdgcn.cluster.workgroup.id.x()
store i32 %result, ptr addrspace(1) %out, align 4
ret void
}

; CHECK-LABEL: for function 'cluster_workgroup_id_y':
; CHECK: ALL VALUES UNIFORM
define void @cluster_workgroup_id_y(ptr addrspace(1) inreg %out) {
%result = call i32 @llvm.amdgcn.cluster.workgroup.id.y()
store i32 %result, ptr addrspace(1) %out, align 4
ret void
}

; CHECK-LABEL: for function 'cluster_workgroup_id_z':
; CHECK: ALL VALUES UNIFORM
define void @cluster_workgroup_id_z(ptr addrspace(1) inreg %out) {
%result = call i32 @llvm.amdgcn.cluster.workgroup.id.z()
store i32 %result, ptr addrspace(1) %out, align 4
ret void
}

; CHECK-LABEL: for function 'cluster_workgroup_flat_id':
; CHECK: ALL VALUES UNIFORM
define void @cluster_workgroup_flat_id(ptr addrspace(1) inreg %out) {
%result = call i32 @llvm.amdgcn.cluster.workgroup.flat.id()
store i32 %result, ptr addrspace(1) %out, align 4
ret void
}

; CHECK-LABEL: for function 'cluster_workgroup_max_id_x':
; CHECK: ALL VALUES UNIFORM
define void @cluster_workgroup_max_id_x(ptr addrspace(1) inreg %out) {
%result = call i32 @llvm.amdgcn.cluster.workgroup.max.id.x()
store i32 %result, ptr addrspace(1) %out, align 4
ret void
}

; CHECK-LABEL: for function 'cluster_workgroup_max_id_y':
; CHECK: ALL VALUES UNIFORM
define void @cluster_workgroup_max_id_y(ptr addrspace(1) inreg %out) {
%result = call i32 @llvm.amdgcn.cluster.workgroup.max.id.y()
store i32 %result, ptr addrspace(1) %out, align 4
ret void
}

; CHECK-LABEL: for function 'cluster_workgroup_max_id_z':
; CHECK: ALL VALUES UNIFORM
define void @cluster_workgroup_max_id_z(ptr addrspace(1) inreg %out) {
%result = call i32 @llvm.amdgcn.cluster.workgroup.max.id.z()
store i32 %result, ptr addrspace(1) %out, align 4
ret void
}

; CHECK-LABEL: for function 'cluster_workgroup_max_flat_id':
; CHECK: ALL VALUES UNIFORM
define void @cluster_workgroup_max_flat_id(ptr addrspace(1) inreg %out) {
%result = call i32 @llvm.amdgcn.cluster.workgroup.max.flat.id()
store i32 %result, ptr addrspace(1) %out, align 4
ret void
}

; CHECK-LABEL: for function 's_memtime':
; CHECK: ALL VALUES UNIFORM
define void @s_memtime(ptr addrspace(1) inreg %out) {
Expand All @@ -144,6 +208,14 @@ declare i64 @llvm.amdgcn.ballot.i32(i1) #1
declare i32 @llvm.amdgcn.workgroup.id.x() #0
declare i32 @llvm.amdgcn.workgroup.id.y() #0
declare i32 @llvm.amdgcn.workgroup.id.z() #0
declare i32 @llvm.amdgcn.cluster.workgroup.id.x()
declare i32 @llvm.amdgcn.cluster.workgroup.id.y()
declare i32 @llvm.amdgcn.cluster.workgroup.id.z()
declare i32 @llvm.amdgcn.cluster.workgroup.flat.id()
declare i32 @llvm.amdgcn.cluster.workgroup.max.id.x()
declare i32 @llvm.amdgcn.cluster.workgroup.max.id.y()
declare i32 @llvm.amdgcn.cluster.workgroup.max.id.z()
declare i32 @llvm.amdgcn.cluster.workgroup.max.flat.id()

attributes #0 = { nounwind readnone }
attributes #1 = { nounwind readnone convergent }
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