1 ; RUN: llc -mtriple=amdgcn-amd-amdhsa < %s | FileCheck -check-prefix=GCN %s 2 3 ; This shows that the amount of LDS estimate is sensitive to the order 4 ; of the LDS globals. 5 6 ; Both of these functions use the same amount of LDS, but the total 7 ; changes depending on the visit order of first use. 8 9 ; The one with the suboptimal order resulting in extra padding exceeds 10 ; the desired limit 11 12 ; The padding estimate heuristic used by the promote alloca pass 13 ; is mostly determined by the order of the globals, 14 15 ; Raw usage = 1060 bytes 16 ; Rounded usage: 17 ; 292 + (4 pad) + 256 + (8 pad) + 512 = 1072 18 ; 512 + (0 pad) + 256 + (0 pad) + 292 = 1060 19 20 ; At default occupancy guess of 7, 2340 bytes available total. 21 22 ; 1280 need to be left to promote alloca 23 ; optimally packed, this requires 24 25 26 @lds0 = internal unnamed_addr addrspace(3) global [32 x <4 x i32>] undef, align 16 27 @lds2 = internal unnamed_addr addrspace(3) global [32 x i64] undef, align 8 28 @lds1 = internal unnamed_addr addrspace(3) global [73 x i32] undef, align 4 29 30 31 ; GCN-LABEL: {{^}}promote_alloca_size_order_0: 32 ; GCN: workgroup_group_segment_byte_size = 2340 33 define void @promote_alloca_size_order_0(i32 addrspace(1)* nocapture %out, i32 addrspace(1)* nocapture %in, i32 %idx) #0 { 34 entry: 35 %stack = alloca [5 x i32], align 4 36 %tmp0 = load i32, i32 addrspace(1)* %in, align 4 37 %arrayidx1 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 %tmp0 38 store i32 4, i32* %arrayidx1, align 4 39 %arrayidx2 = getelementptr inbounds i32, i32 addrspace(1)* %in, i32 1 40 %tmp1 = load i32, i32 addrspace(1)* %arrayidx2, align 4 41 %arrayidx3 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 %tmp1 42 store i32 5, i32* %arrayidx3, align 4 43 %arrayidx10 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 0 44 %tmp2 = load i32, i32* %arrayidx10, align 4 45 store i32 %tmp2, i32 addrspace(1)* %out, align 4 46 %arrayidx12 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 1 47 %tmp3 = load i32, i32* %arrayidx12 48 %arrayidx13 = getelementptr inbounds i32, i32 addrspace(1)* %out, i32 1 49 store i32 %tmp3, i32 addrspace(1)* %arrayidx13 50 51 %gep.lds1 = getelementptr inbounds [73 x i32], [73 x i32] addrspace(3)* @lds1, i32 0, i32 %idx 52 store volatile i32 0, i32 addrspace(3)* %gep.lds1, align 4 53 54 %gep.lds2 = getelementptr inbounds [32 x i64], [32 x i64] addrspace(3)* @lds2, i32 0, i32 %idx 55 store volatile i64 0, i64 addrspace(3)* %gep.lds2, align 8 56 57 %gep.lds0 = getelementptr inbounds [32 x <4 x i32>], [32 x <4 x i32>] addrspace(3)* @lds0, i32 0, i32 %idx 58 store volatile <4 x i32> zeroinitializer, <4 x i32> addrspace(3)* %gep.lds0, align 16 59 60 ret void 61 } 62 63 ; GCN-LABEL: {{^}}promote_alloca_size_order_1: 64 ; GCN: workgroup_group_segment_byte_size = 2352 65 define void @promote_alloca_size_order_1(i32 addrspace(1)* nocapture %out, i32 addrspace(1)* nocapture %in, i32 %idx) #0 { 66 entry: 67 %stack = alloca [5 x i32], align 4 68 %tmp0 = load i32, i32 addrspace(1)* %in, align 4 69 %arrayidx1 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 %tmp0 70 store i32 4, i32* %arrayidx1, align 4 71 %arrayidx2 = getelementptr inbounds i32, i32 addrspace(1)* %in, i32 1 72 %tmp1 = load i32, i32 addrspace(1)* %arrayidx2, align 4 73 %arrayidx3 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 %tmp1 74 store i32 5, i32* %arrayidx3, align 4 75 %arrayidx10 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 0 76 %tmp2 = load i32, i32* %arrayidx10, align 4 77 store i32 %tmp2, i32 addrspace(1)* %out, align 4 78 %arrayidx12 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 1 79 %tmp3 = load i32, i32* %arrayidx12 80 %arrayidx13 = getelementptr inbounds i32, i32 addrspace(1)* %out, i32 1 81 store i32 %tmp3, i32 addrspace(1)* %arrayidx13 82 83 %gep.lds0 = getelementptr inbounds [32 x <4 x i32>], [32 x <4 x i32>] addrspace(3)* @lds0, i32 0, i32 %idx 84 store volatile <4 x i32> zeroinitializer, <4 x i32> addrspace(3)* %gep.lds0, align 16 85 86 %gep.lds2 = getelementptr inbounds [32 x i64], [32 x i64] addrspace(3)* @lds2, i32 0, i32 %idx 87 store volatile i64 0, i64 addrspace(3)* %gep.lds2, align 8 88 89 %gep.lds1 = getelementptr inbounds [73 x i32], [73 x i32] addrspace(3)* @lds1, i32 0, i32 %idx 90 store volatile i32 0, i32 addrspace(3)* %gep.lds1, align 4 91 92 ret void 93 } 94 95 @lds3 = internal unnamed_addr addrspace(3) global [13 x i32] undef, align 4 96 @lds4 = internal unnamed_addr addrspace(3) global [63 x <4 x i32>] undef, align 16 97 98 ; The guess from the alignment padding pushes this over the determined 99 ; size limit, so it isn't promoted 100 101 ; GCN-LABEL: {{^}}promote_alloca_align_pad_guess_over_limit: 102 ; GCN: workgroup_group_segment_byte_size = 1060 103 define void @promote_alloca_align_pad_guess_over_limit(i32 addrspace(1)* nocapture %out, i32 addrspace(1)* nocapture %in, i32 %idx) #0 { 104 entry: 105 %stack = alloca [5 x i32], align 4 106 %tmp0 = load i32, i32 addrspace(1)* %in, align 4 107 %arrayidx1 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 %tmp0 108 store i32 4, i32* %arrayidx1, align 4 109 %arrayidx2 = getelementptr inbounds i32, i32 addrspace(1)* %in, i32 1 110 %tmp1 = load i32, i32 addrspace(1)* %arrayidx2, align 4 111 %arrayidx3 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 %tmp1 112 store i32 5, i32* %arrayidx3, align 4 113 %arrayidx10 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 0 114 %tmp2 = load i32, i32* %arrayidx10, align 4 115 store i32 %tmp2, i32 addrspace(1)* %out, align 4 116 %arrayidx12 = getelementptr inbounds [5 x i32], [5 x i32]* %stack, i32 0, i32 1 117 %tmp3 = load i32, i32* %arrayidx12 118 %arrayidx13 = getelementptr inbounds i32, i32 addrspace(1)* %out, i32 1 119 store i32 %tmp3, i32 addrspace(1)* %arrayidx13 120 121 %gep.lds3 = getelementptr inbounds [13 x i32], [13 x i32] addrspace(3)* @lds3, i32 0, i32 %idx 122 store volatile i32 0, i32 addrspace(3)* %gep.lds3, align 4 123 124 %gep.lds4 = getelementptr inbounds [63 x <4 x i32>], [63 x <4 x i32>] addrspace(3)* @lds4, i32 0, i32 %idx 125 store volatile <4 x i32> zeroinitializer, <4 x i32> addrspace(3)* %gep.lds4, align 16 126 127 ret void 128 } 129 130 attributes #0 = { nounwind "amdgpu-max-work-group-size"="64" } 131
