test/CodeGen/AMDGPU/reqd-work-group-size.ll - llvm-project/llvm - Git at Google

 ; RUN: opt -mtriple=amdgcn-amd-amdhsa -S -passes=amdgpu-lower-kernel-attributes,instcombine %s | FileCheck -enable-var-scope %s
 ; RUN: opt -mtriple=amdgcn-amd-amdhsa -S -passes=amdgpu-lower-kernel-attributes,instcombine %s | FileCheck -enable-var-scope %s

 target datalayout = "n32"

 ; CHECK-LABEL: @invalid_reqd_work_group_size(
 ; CHECK: load i16,
 define amdgpu_kernel void @invalid_reqd_work_group_size(ptr addrspace(1) %out) #0 !reqd_work_group_size !1 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   store i16 %group.size.x, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @volatile_load_group_size_x(
 ; CHECK: load volatile i16,
 define amdgpu_kernel void @volatile_load_group_size_x(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load volatile i16, ptr addrspace(4) %gep.group.size.x, align 4
   store i16 %group.size.x, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @load_group_size_x(
 ; CHECK-NEXT: store i16 8,
 define amdgpu_kernel void @load_group_size_x(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   store i16 %group.size.x, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @load_group_size_y(
 ; CHECK-NEXT: store i16 16,
 define amdgpu_kernel void @load_group_size_y(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.y = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 6
   %group.size.y = load i16, ptr addrspace(4) %gep.group.size.y, align 4
   store i16 %group.size.y, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @load_group_size_z(
 ; CHECK-NEXT: store i16 2,
 define amdgpu_kernel void @load_group_size_z(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.z = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 8
   %group.size.z = load i16, ptr addrspace(4) %gep.group.size.z, align 4
   store i16 %group.size.z, ptr addrspace(1) %out
   ret void
 }

 ; Metadata uses i64 instead of i32
 ; CHECK-LABEL: @load_group_size_x_reqd_work_group_size_i64(
 ; CHECK-NEXT: store i16 8,
 define amdgpu_kernel void @load_group_size_x_reqd_work_group_size_i64(ptr addrspace(1) %out) #0 !reqd_work_group_size !2 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   store i16 %group.size.x, ptr addrspace(1) %out
   ret void
 }

 ; Metadata uses i16 instead of i32
 ; CHECK-LABEL: @load_group_size_x_reqd_work_group_size_i16(
 ; CHECK-NEXT: store i16 8,
 define amdgpu_kernel void @load_group_size_x_reqd_work_group_size_i16(ptr addrspace(1) %out) #0 !reqd_work_group_size !3 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   store i16 %group.size.x, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @use_local_size_x_8_16_2(
 ; CHECK-NEXT: store i64 8,
 define amdgpu_kernel void @use_local_size_x_8_16_2(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   %gep.grid.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 12
   %grid.size.x = load i32, ptr addrspace(4) %gep.grid.size.x, align 4
   %group.id = tail call i32 @llvm.amdgcn.workgroup.id.x()
   %group.size.x.zext = zext i16 %group.size.x to i32
   %group.id_x_group.size.x = mul i32 %group.id, %group.size.x.zext
   %sub = sub i32 %grid.size.x, %group.id_x_group.size.x
   %umin = call i32 @llvm.umin.i32(i32 %sub, i32 %group.size.x.zext)
   %zext = zext i32 %umin to i64
   store i64 %zext, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @use_local_size_y_8_16_2(
 ; CHECK-NEXT: store i64 16,
 define amdgpu_kernel void @use_local_size_y_8_16_2(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.y = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 6
   %group.size.y = load i16, ptr addrspace(4) %gep.group.size.y, align 4
   %gep.grid.size.y = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 16
   %grid.size.y = load i32, ptr addrspace(4) %gep.grid.size.y, align 4
   %group.id = tail call i32 @llvm.amdgcn.workgroup.id.y()
   %group.size.y.zext = zext i16 %group.size.y to i32
   %group.id_x_group.size.y = mul i32 %group.id, %group.size.y.zext
   %sub = sub i32 %grid.size.y, %group.id_x_group.size.y
   %umin = call i32 @llvm.umin.i32(i32 %sub, i32 %group.size.y.zext)
   %zext = zext i32 %umin to i64
   store i64 %zext, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @use_local_size_z_8_16_2(
 ; CHECK-NEXT: store i64 2,
 define amdgpu_kernel void @use_local_size_z_8_16_2(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.z = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 8
   %group.size.z = load i16, ptr addrspace(4) %gep.group.size.z, align 4
   %gep.grid.size.z = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 20
   %grid.size.z = load i32, ptr addrspace(4) %gep.grid.size.z, align 4
   %group.id = tail call i32 @llvm.amdgcn.workgroup.id.z()
   %group.size.z.zext = zext i16 %group.size.z to i32
   %group.id_x_group.size.z = mul i32 %group.id, %group.size.z.zext
   %sub = sub i32 %grid.size.z, %group.id_x_group.size.z
   %umin = call i32 @llvm.umin.i32(i32 %sub, i32 %group.size.z.zext)
   %zext = zext i32 %umin to i64
   store i64 %zext, ptr addrspace(1) %out
   ret void
 }

 ; Simplification on select is invalid, but we can still eliminate the
 ; load of the group size.

 ; CHECK-LABEL: @local_size_x_8_16_2_wrong_group_id(
 ; CHECK: %group.id = tail call i32 @llvm.amdgcn.workgroup.id.y()
 ; CHECK: %group.id_x_group.size.x = shl i32 %group.id, 3
 define amdgpu_kernel void @local_size_x_8_16_2_wrong_group_id(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   %gep.grid.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 12
   %grid.size.x = load i32, ptr addrspace(4) %gep.grid.size.x, align 4
   %group.id = tail call i32 @llvm.amdgcn.workgroup.id.y()
   %group.size.x.zext = zext i16 %group.size.x to i32
   %group.id_x_group.size.x = mul i32 %group.id, %group.size.x.zext
   %sub = sub i32 %grid.size.x, %group.id_x_group.size.x
   %umin = call i32 @llvm.umin.i32(i32 %sub, i32 %group.size.x.zext)
   %zext = zext i32 %umin to i64
   store i64 %zext, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @local_size_x_8_16_2_wrong_grid_size(
 ; CHECK: %grid.size.x = load i32, ptr addrspace(4) %gep.grid.size.x, align 4
 ; CHECK: %group.id = tail call i32 @llvm.amdgcn.workgroup.id.x()
 ; CHECK: %group.id_x_group.size.x = shl i32 %group.id, 3
   define amdgpu_kernel void @local_size_x_8_16_2_wrong_grid_size(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   %gep.grid.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 16
   %grid.size.x = load i32, ptr addrspace(4) %gep.grid.size.x, align 4
   %group.id = tail call i32 @llvm.amdgcn.workgroup.id.x()
   %group.size.x.zext = zext i16 %group.size.x to i32
   %group.id_x_group.size.x = mul i32 %group.id, %group.size.x.zext
   %sub = sub i32 %grid.size.x, %group.id_x_group.size.x
   %umin = call i32 @llvm.umin.i32(i32 %sub, i32 %group.size.x.zext)
   %zext = zext i32 %umin to i64
   store i64 %zext, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @local_size_x_8_16_2_wrong_cmp_type(
 ; CHECK: %grid.size.x = load i32, ptr addrspace(4) %gep.grid.size.x, align 4
 ; CHECK: %group.id = tail call i32 @llvm.amdgcn.workgroup.id.x()
 ; CHECK: %group.id_x_group.size.x = shl i32 %group.id, 3
 ; CHECK: %sub = sub i32 %grid.size.x, %group.id_x_group.size.x
 ; CHECK: %smin = call i32 @llvm.smin.i32(i32 %sub, i32 8)
 define amdgpu_kernel void @local_size_x_8_16_2_wrong_cmp_type(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   %gep.grid.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 12
   %grid.size.x = load i32, ptr addrspace(4) %gep.grid.size.x, align 4
   %group.id = tail call i32 @llvm.amdgcn.workgroup.id.x()
   %group.size.x.zext = zext i16 %group.size.x to i32
   %group.id_x_group.size.x = mul i32 %group.id, %group.size.x.zext
   %sub = sub i32 %grid.size.x, %group.id_x_group.size.x
   %smin = call i32 @llvm.smin.i32(i32 %sub, i32 %group.size.x.zext)
   %zext = zext i32 %smin to i64
   store i64 %zext, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @local_size_x_8_16_2_wrong_select(
 ; CHECK: %group.id_x_group.size.x = shl i32 %group.id, 3
 ; CHECK: %sub = sub i32 %grid.size.x, %group.id_x_group.size.x
 ; CHECK: %umax = call i32 @llvm.umax.i32(i32 %sub, i32 8)
 ; CHECK: %zext = zext i32 %umax to i64
 define amdgpu_kernel void @local_size_x_8_16_2_wrong_select(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   %gep.grid.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 12
   %grid.size.x = load i32, ptr addrspace(4) %gep.grid.size.x, align 4
   %group.id = tail call i32 @llvm.amdgcn.workgroup.id.x()
   %group.size.x.zext = zext i16 %group.size.x to i32
   %group.id_x_group.size.x = mul i32 %group.id, %group.size.x.zext
   %sub = sub i32 %grid.size.x, %group.id_x_group.size.x
   %umax = call i32 @llvm.umax.i32(i32 %sub, i32 %group.size.x.zext)
   %zext = zext i32 %umax to i64
   store i64 %zext, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @use_local_size_x_8_16_2_wrong_grid_load_size(
 ; CHECK: %grid.size.x = load i16, ptr addrspace(4) %gep.grid.size.x, align 4
 ; CHECK: %grid.size.x.zext = zext i16 %grid.size.x to i32
 ; CHECK: %group.id = tail call i32 @llvm.amdgcn.workgroup.id.x()
 ; CHECK: %group.id_x_group.size.x = shl i32 %group.id, 3
 ; CHECK: %sub = sub i32 %grid.size.x.zext, %group.id_x_group.size.x
 define amdgpu_kernel void @use_local_size_x_8_16_2_wrong_grid_load_size(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   %gep.grid.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 12
   %grid.size.x = load i16, ptr addrspace(4) %gep.grid.size.x, align 4
   %grid.size.x.zext = zext i16 %grid.size.x to i32
   %group.id = tail call i32 @llvm.amdgcn.workgroup.id.x()
   %group.size.x.zext = zext i16 %group.size.x to i32
   %group.id_x_group.size.x = mul i32 %group.id, %group.size.x.zext
   %sub = sub i32 %grid.size.x.zext, %group.id_x_group.size.x
   %umin = call i32 @llvm.umin.i32(i32 %sub, i32 %group.size.x.zext)
   %zext = zext i32 %umin to i64
   store i64 %zext, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @func_group_size_x(
 ; CHECK-NEXT: ret i32 8
 define i32 @func_group_size_x(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   %zext = zext i16 %group.size.x to i32
   ret i32 %zext
 }

 ; CHECK-LABEL: @__ockl_get_local_size_reqd_size(
 ; CHECK: %group.size = phi i32 [ 2, %bb17 ], [ 16, %bb9 ], [ 8, %bb1 ], [ 1, %bb ]
 define i64 @__ockl_get_local_size_reqd_size(i32 %arg) #1 !reqd_work_group_size !0 {
 bb:
   %tmp = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr() #2
   switch i32 %arg, label %bb25 [
     i32 0, label %bb1
     i32 1, label %bb9
     i32 2, label %bb17
   ]

 bb1:                                              ; preds = %bb
   %tmp2 = tail call i32 @llvm.amdgcn.workgroup.id.x()
   %tmp3 = getelementptr inbounds i8, ptr addrspace(4) %tmp, i64 12
   %tmp5 = load i32, ptr addrspace(4) %tmp3, align 4
   %tmp6 = getelementptr inbounds i8, ptr addrspace(4) %tmp, i64 4
   %tmp8 = load i16, ptr addrspace(4) %tmp6, align 4
   br label %bb25

 bb9:                                              ; preds = %bb
   %tmp10 = tail call i32 @llvm.amdgcn.workgroup.id.y()
   %tmp11 = getelementptr inbounds i8, ptr addrspace(4) %tmp, i64 16
   %tmp13 = load i32, ptr addrspace(4) %tmp11, align 8
   %tmp14 = getelementptr inbounds i8, ptr addrspace(4) %tmp, i64 6
   %tmp16 = load i16, ptr addrspace(4) %tmp14, align 2
   br label %bb25

 bb17:                                             ; preds = %bb
   %tmp18 = tail call i32 @llvm.amdgcn.workgroup.id.z()
   %tmp19 = getelementptr inbounds i8, ptr addrspace(4) %tmp, i64 20
   %tmp21 = load i32, ptr addrspace(4) %tmp19, align 4
   %tmp22 = getelementptr inbounds i8, ptr addrspace(4) %tmp, i64 8
   %tmp24 = load i16, ptr addrspace(4) %tmp22, align 8
   br label %bb25

 bb25:                                             ; preds = %bb17, %bb9, %bb1, %bb
   %tmp26 = phi i32 [ %tmp21, %bb17 ], [ %tmp13, %bb9 ], [ %tmp5, %bb1 ], [ 0, %bb ]
   %group.size = phi i16 [ %tmp24, %bb17 ], [ %tmp16, %bb9 ], [ %tmp8, %bb1 ], [ 1, %bb ]
   %tmp28 = phi i32 [ %tmp18, %bb17 ], [ %tmp10, %bb9 ], [ %tmp2, %bb1 ], [ 0, %bb ]
   %tmp29 = zext i16 %group.size to i32
   %tmp30 = mul i32 %tmp28, %tmp29
   %tmp31 = sub i32 %tmp26, %tmp30
   %umin = call i32 @llvm.umin.i32(i32 %tmp31, i32 %tmp29)
   %tmp34 = zext i32 %umin to i64
   ret i64 %tmp34
 }

 ; CHECK-LABEL: @all_local_size(
 ; CHECK-NEXT: store volatile i64 8, ptr addrspace(1) %out, align 4
 ; CHECK-NEXT: store volatile i64 16, ptr addrspace(1) %out, align 4
 ; CHECK-NEXT: store volatile i64 2, ptr addrspace(1) %out, align 4
 define amdgpu_kernel void @all_local_size(ptr addrspace(1) nocapture readnone %out) #0 !reqd_work_group_size !0 {
   %tmp.i = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr() #0
   %tmp2.i = tail call i32 @llvm.amdgcn.workgroup.id.x() #0
   %tmp3.i = getelementptr inbounds i8, ptr addrspace(4) %tmp.i, i64 12
   %tmp5.i = load i32, ptr addrspace(4) %tmp3.i, align 4
   %tmp6.i = getelementptr inbounds i8, ptr addrspace(4) %tmp.i, i64 4
   %tmp8.i = load i16, ptr addrspace(4) %tmp6.i, align 4
   %tmp29.i = zext i16 %tmp8.i to i32
   %tmp30.i = mul i32 %tmp2.i, %tmp29.i
   %tmp31.i = sub i32 %tmp5.i, %tmp30.i
   %umin0 = call i32 @llvm.umin.i32(i32 %tmp31.i, i32 %tmp29.i)
   %tmp34.i = zext i32 %umin0 to i64
   %tmp10.i = tail call i32 @llvm.amdgcn.workgroup.id.y() #0
   %tmp11.i = getelementptr inbounds i8, ptr addrspace(4) %tmp.i, i64 16
   %tmp13.i = load i32, ptr addrspace(4) %tmp11.i, align 8
   %tmp14.i = getelementptr inbounds i8, ptr addrspace(4) %tmp.i, i64 6
   %tmp16.i = load i16, ptr addrspace(4) %tmp14.i, align 2
   %tmp29.i9 = zext i16 %tmp16.i to i32
   %tmp30.i10 = mul i32 %tmp10.i, %tmp29.i9
   %tmp31.i11 = sub i32 %tmp13.i, %tmp30.i10
   %umin1 = call i32 @llvm.umin.i32(i32 %tmp31.i11, i32 %tmp29.i9)
   %tmp34.i14 = zext i32 %umin1 to i64
   %tmp18.i = tail call i32 @llvm.amdgcn.workgroup.id.z() #0
   %tmp19.i = getelementptr inbounds i8, ptr addrspace(4) %tmp.i, i64 20
   %tmp21.i = load i32, ptr addrspace(4) %tmp19.i, align 4
   %tmp22.i = getelementptr inbounds i8, ptr addrspace(4) %tmp.i, i64 8
   %tmp24.i = load i16, ptr addrspace(4) %tmp22.i, align 8
   %tmp29.i2 = zext i16 %tmp24.i to i32
   %tmp30.i3 = mul i32 %tmp18.i, %tmp29.i2
   %tmp31.i4 = sub i32 %tmp21.i, %tmp30.i3
   %umin2 = call i32 @llvm.umin.i32(i32 %tmp31.i4, i32 %tmp29.i2)
   %tmp34.i7 = zext i32 %umin2 to i64
   store volatile i64 %tmp34.i, ptr addrspace(1) %out, align 4
   store volatile i64 %tmp34.i14, ptr addrspace(1) %out, align 4
   store volatile i64 %tmp34.i7, ptr addrspace(1) %out, align 4
   ret void
 }

 ; TODO: Should be able to handle this, but not much reason to.
 ; CHECK-LABEL: @partial_load_group_size_x(
 ; CHECK-NEXT: %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
 ; CHECK-NEXT: %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
 ; CHECK-NEXT: %group.size.x.lo = load i8, ptr addrspace(4) %gep.group.size.x, align 4
 ; CHECK-NEXT: store i8 %group.size.x.lo, ptr addrspace(1) %out, align 1
 define amdgpu_kernel void @partial_load_group_size_x(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x.lo = load i8, ptr addrspace(4) %gep.group.size.x, align 1
   store i8 %group.size.x.lo, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @partial_load_group_size_x_explicit_callsite_align(
 ; CHECK-NEXT: %dispatch.ptr = tail call align 2 ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
 ; CHECK-NEXT: %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
 ; CHECK-NEXT: %group.size.x.lo = load i8, ptr addrspace(4) %gep.group.size.x, align 2
 ; CHECK-NEXT: store i8 %group.size.x.lo, ptr addrspace(1) %out, align 1
 define amdgpu_kernel void @partial_load_group_size_x_explicit_callsite_align(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call align 2 ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x.lo = load i8, ptr addrspace(4) %gep.group.size.x, align 1
   store i8 %group.size.x.lo, ptr addrspace(1) %out
   ret void
 }

 ; TODO: Should be able to handle this
 ; CHECK-LABEL: @load_group_size_xy_i32(
 ; CHECK: %group.size.xy = load i32,
 ; CHECK: store i32 %group.size.xy
 define amdgpu_kernel void @load_group_size_xy_i32(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.xy = load i32, ptr addrspace(4) %gep.group.size.x, align 4
   store i32 %group.size.xy, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @load_group_size_x_y_multiple_dispatch_ptr(
 ; CHECK-NEXT: store volatile i16 8, ptr addrspace(1) %out, align 2
 ; CHECK-NEXT: store volatile i16 16, ptr addrspace(1) %out, align 2
 define amdgpu_kernel void @load_group_size_x_y_multiple_dispatch_ptr(ptr addrspace(1) %out) #0 !reqd_work_group_size !0 {
   %dispatch.ptr0 = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr0, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   store volatile i16 %group.size.x, ptr addrspace(1) %out

   %dispatch.ptr1 = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.y = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr1, i64 6
   %group.size.y = load i16, ptr addrspace(4) %gep.group.size.y, align 4
   store volatile i16 %group.size.y, ptr addrspace(1) %out

   ret void
 }

 ; CHECK-LABEL: @use_local_size_x_uniform_work_group_size(
 ; CHECK-NEXT: %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
 ; CHECK-NEXT: %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
 ; CHECK-NEXT: %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
 ; CHECK-NEXT: %zext = zext i16 %group.size.x to i64
 ; CHECK-NEXT: store i64 %zext, ptr addrspace(1) %out, align 4
 define amdgpu_kernel void @use_local_size_x_uniform_work_group_size(ptr addrspace(1) %out) #2 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   %gep.grid.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 12
   %grid.size.x = load i32, ptr addrspace(4) %gep.grid.size.x, align 4
   %group.id = tail call i32 @llvm.amdgcn.workgroup.id.x()
   %group.size.x.zext = zext i16 %group.size.x to i32
   %group.id_x_group.size.x = mul i32 %group.id, %group.size.x.zext
   %sub = sub i32 %grid.size.x, %group.id_x_group.size.x
   %umin = call i32 @llvm.umin.i32(i32 %sub, i32 %group.size.x.zext)
   %zext = zext i32 %umin to i64
   store i64 %zext, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @use_local_size_x_uniform_work_group_size_false(
 ; CHECK: call i32 @llvm.umin
 define amdgpu_kernel void @use_local_size_x_uniform_work_group_size_false(ptr addrspace(1) %out) #3 {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   %gep.group.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 4
   %group.size.x = load i16, ptr addrspace(4) %gep.group.size.x, align 4
   %gep.grid.size.x = getelementptr inbounds i8, ptr addrspace(4) %dispatch.ptr, i64 12
   %grid.size.x = load i32, ptr addrspace(4) %gep.grid.size.x, align 4
   %group.id = tail call i32 @llvm.amdgcn.workgroup.id.x()
   %group.size.x.zext = zext i16 %group.size.x to i32
   %group.id_x_group.size.x = mul i32 %group.id, %group.size.x.zext
   %sub = sub i32 %grid.size.x, %group.id_x_group.size.x
   %umin = call i32 @llvm.umin.i32(i32 %sub, i32 %group.size.x.zext)
   %zext = zext i32 %umin to i64
   store i64 %zext, ptr addrspace(1) %out
   ret void
 }

 ; CHECK-LABEL: @no_use_dispatch_ptr(
 ; CHECK-NEXT: ret void
 define amdgpu_kernel void @no_use_dispatch_ptr() {
   %dispatch.ptr = tail call ptr addrspace(4) @llvm.amdgcn.dispatch.ptr()
   ret void
 }

 declare ptr addrspace(4) @llvm.amdgcn.dispatch.ptr() #1
 declare i32 @llvm.amdgcn.workgroup.id.x() #1
 declare i32 @llvm.amdgcn.workgroup.id.y() #1
 declare i32 @llvm.amdgcn.workgroup.id.z() #1
 declare i32 @llvm.umin.i32(i32, i32) #1
 declare i32 @llvm.smin.i32(i32, i32) #1
 declare i32 @llvm.umax.i32(i32, i32) #1

 attributes #0 = { nounwind "uniform-work-group-size"="true" }
 attributes #1 = { nounwind readnone speculatable }
 attributes #2 = { nounwind "uniform-work-group-size"="true" }
 attributes #3 = { nounwind "uniform-work-group-size"="false" }

 !0 = !{i32 8, i32 16, i32 2}
 !1 = !{i32 8, i32 16}
 !2 = !{i64 8, i64 16, i64 2}
 !3 = !{i16 8, i16 16, i16 2}