1; RUN: opt %loadPolly -polly-flatten-schedule -polly-delicm -analyze < %s | FileCheck %s 2; 3; void func(double *A) { 4; for (int j = 0; j < 2; j += 1) { /* outer */ 5; double phi = 0.0; 6; for (int i = 0; i < 4; i += 1) /* reduction */ 7; phi += 4.2; 8; A[j] = phi; 9; } 10; } 11; 12define void @func(double* noalias nonnull %A) { 13entry: 14 br label %outer.preheader 15 16outer.preheader: 17 br label %outer.for 18 19outer.for: 20 %j = phi i32 [0, %outer.preheader], [%j.inc, %outer.inc] 21 %j.cmp = icmp slt i32 %j, 2 22 br i1 %j.cmp, label %reduction.preheader, label %outer.exit 23 24 25 reduction.preheader: 26 br label %reduction.for 27 28 reduction.for: 29 %i = phi i32 [0, %reduction.preheader], [%i.inc, %reduction.inc] 30 %phi = phi double [0.0, %reduction.preheader], [%add, %reduction.inc] 31 %i.cmp = icmp slt i32 %i, 4 32 br i1 %i.cmp, label %body, label %reduction.exit 33 34 35 36 body: 37 %add = fadd double %phi, 4.2 38 br label %reduction.inc 39 40 41 42 reduction.inc: 43 %i.inc = add nuw nsw i32 %i, 1 44 br label %reduction.for 45 46 reduction.exit: 47 %A_idx = getelementptr inbounds double, double* %A, i32 %j 48 store double %phi, double* %A_idx 49 br label %outer.inc 50 51 52 53outer.inc: 54 %j.inc = add nuw nsw i32 %j, 1 55 br label %outer.for 56 57outer.exit: 58 br label %return 59 60return: 61 ret void 62} 63 64 65; Unrolled flattened schedule: 66; [0] Stmt_reduction_preheader[0] 67; [1] Stmt_reduction_for[0, 0] 68; [2] Stmt_body[0, 0] 69; [3] Stmt_reduction_inc[0, 0] 70; [4] Stmt_reduction_for[0, 1] 71; [5] Stmt_body[0, 1] 72; [6] Stmt_reduction_inc[0, 1] 73; [7] Stmt_reduction_for[0, 2] 74; [8] Stmt_body[0, 2] 75; [9] Stmt_reduction_inc[0, 2] 76; [10] Stmt_reduction_for[0, 3] 77; [11] Stmt_body[0, 3] 78; [12] Stmt_reduction_inc[0, 3] 79; [13] Stmt_reduction_for[0, 4] 80; [14] Stmt_reduction_exit[0] 81; [15] Stmt_reduction_preheader[0] 82; [16] Stmt_reduction_for[1, 0] 83; [17] Stmt_body[1, 0] 84; [18] Stmt_reduction_inc[1, 0] 85; [19] Stmt_reduction_for[1, 1] 86; [20] Stmt_body[1, 1] 87; [21] Stmt_reduction_inc[1, 1] 88; [22] Stmt_reduction_for[1, 2] 89; [23] Stmt_body[1, 2] 90; [24] Stmt_reduction_inc[1, 2] 91; [25] Stmt_reduction_for[1, 3] 92; [26] Stmt_body[1, 3] 93; [27] Stmt_reduction_inc[1, 3] 94; [28] Stmt_reduction_for[1, 4] 95; [29] Stmt_reduction_exit[1] 96 97; CHECK: After accesses { 98; CHECK-NEXT: Stmt_reduction_preheader 99; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 1] 100; CHECK-NEXT: { Stmt_reduction_preheader[i0] -> MemRef_phi__phi[] }; 101; CHECK-NEXT: new: { Stmt_reduction_preheader[i0] -> MemRef_A[i0] }; 102; CHECK-NEXT: Stmt_reduction_for 103; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 1] 104; CHECK-NEXT: { Stmt_reduction_for[i0, i1] -> MemRef_phi__phi[] }; 105; CHECK-NEXT: new: { Stmt_reduction_for[i0, i1] -> MemRef_A[i0] }; 106; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 1] 107; CHECK-NEXT: { Stmt_reduction_for[i0, i1] -> MemRef_phi[] }; 108; CHECK-NEXT: new: { Stmt_reduction_for[i0, i1] -> MemRef_A[i0] }; 109; CHECK-NEXT: Stmt_body 110; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 1] 111; CHECK-NEXT: { Stmt_body[i0, i1] -> MemRef_add[] }; 112; CHECK-NEXT: new: { Stmt_body[i0, i1] -> MemRef_A[i0] }; 113; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 1] 114; CHECK-NEXT: { Stmt_body[i0, i1] -> MemRef_phi[] }; 115; CHECK-NEXT: new: { Stmt_body[i0, i1] -> MemRef_A[i0] }; 116; CHECK-NEXT: Stmt_reduction_inc 117; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 1] 118; CHECK-NEXT: { Stmt_reduction_inc[i0, i1] -> MemRef_add[] }; 119; CHECK-NEXT: new: { Stmt_reduction_inc[i0, i1] -> MemRef_A[i0] : i1 <= 7 - 5i0; Stmt_reduction_inc[1, 3] -> MemRef_A[1] }; 120; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 1] 121; CHECK-NEXT: { Stmt_reduction_inc[i0, i1] -> MemRef_phi__phi[] }; 122; CHECK-NEXT: new: { Stmt_reduction_inc[i0, i1] -> MemRef_A[i0] }; 123; CHECK-NEXT: Stmt_reduction_exit 124; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 0] 125; CHECK-NEXT: { Stmt_reduction_exit[i0] -> MemRef_A[i0] }; 126; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 1] 127; CHECK-NEXT: { Stmt_reduction_exit[i0] -> MemRef_phi[] }; 128; CHECK-NEXT: new: { Stmt_reduction_exit[i0] -> MemRef_A[i0] }; 129; CHECK-NEXT: } 130 131