1; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 4 2; RUN: opt -S -disable-output "-passes=print<scalar-evolution>" -scalar-evolution-classify-expressions=0 < %s 2>&1 | FileCheck %s 3 4define void @u_0(i8 %rhs) { 5; E.g.: %rhs = 255, %start = 99, backedge taken 156 times 6; 7; CHECK-LABEL: 'u_0' 8; CHECK-NEXT: Determining loop execution counts for: @u_0 9; CHECK-NEXT: Loop %loop: backedge-taken count is (-100 + (-1 * %rhs) + ((100 + %rhs) umax %rhs)) 10; CHECK-NEXT: Loop %loop: constant max backedge-taken count is i8 -100, actual taken count either this or zero. 11; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is (-100 + (-1 * %rhs) + ((100 + %rhs) umax %rhs)), actual taken count either this or zero. 12; CHECK-NEXT: Loop %loop: Trip multiple is 1 13; 14entry: 15 %start = add i8 %rhs, 100 16 br label %loop 17 18loop: 19 %iv = phi i8 [ %start, %entry ], [ %iv.inc, %loop ] 20 %iv.inc = add nuw i8 %iv, 1 ;; Note: this never unsigned-wraps 21 %iv.cmp = icmp ult i8 %iv, %rhs 22 br i1 %iv.cmp, label %loop, label %leave 23 24 25leave: 26 ret void 27} 28 29define void @u_1(i8 %start) { 30; 31; CHECK-LABEL: 'u_1' 32; CHECK-NEXT: Determining loop execution counts for: @u_1 33; CHECK-NEXT: Loop %loop: backedge-taken count is ((-1 * %start) + ((-100 + %start) umax %start)) 34; CHECK-NEXT: Loop %loop: constant max backedge-taken count is i8 -100, actual taken count either this or zero. 35; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is ((-1 * %start) + ((-100 + %start) umax %start)), actual taken count either this or zero. 36; CHECK-NEXT: Loop %loop: Trip multiple is 1 37; 38entry: 39; E.g.: %start = 99, %rhs = 255, backedge taken 156 times 40 %rhs = add i8 %start, -100 41 br label %loop 42 43loop: 44 %iv = phi i8 [ %start, %entry ], [ %iv.inc, %loop ] 45 %iv.inc = add nuw i8 %iv, 1 ;; Note: this never unsigned-wraps 46 %iv.cmp = icmp ult i8 %iv, %rhs 47 br i1 %iv.cmp, label %loop, label %leave 48 49 50leave: 51 ret void 52} 53 54define void @s_0(i8 %rhs) { 55; 56; CHECK-LABEL: 's_0' 57; CHECK-NEXT: Determining loop execution counts for: @s_0 58; CHECK-NEXT: Loop %loop: backedge-taken count is (-100 + (-1 * %rhs) + ((100 + %rhs) smax %rhs)) 59; CHECK-NEXT: Loop %loop: constant max backedge-taken count is i8 -100, actual taken count either this or zero. 60; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is (-100 + (-1 * %rhs) + ((100 + %rhs) smax %rhs)), actual taken count either this or zero. 61; CHECK-NEXT: Loop %loop: Trip multiple is 1 62; 63entry: 64; E.g.: %rhs = 127, %start = -29, backedge taken 156 times 65 %start = add i8 %rhs, 100 66 br label %loop 67 68loop: 69 %iv = phi i8 [ %start, %entry ], [ %iv.inc, %loop ] 70 %iv.inc = add nsw i8 %iv, 1 ;; Note: this never signed-wraps 71 %iv.cmp = icmp slt i8 %iv, %rhs 72 br i1 %iv.cmp, label %loop, label %leave 73 74 75leave: 76 ret void 77} 78 79define void @s_1(i8 %start) { 80; 81; CHECK-LABEL: 's_1' 82; CHECK-NEXT: Determining loop execution counts for: @s_1 83; CHECK-NEXT: Loop %loop: backedge-taken count is ((-1 * %start) + ((-100 + %start) smax %start)) 84; CHECK-NEXT: Loop %loop: constant max backedge-taken count is i8 -100, actual taken count either this or zero. 85; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is ((-1 * %start) + ((-100 + %start) smax %start)), actual taken count either this or zero. 86; CHECK-NEXT: Loop %loop: Trip multiple is 1 87; 88entry: 89; E.g.: start = -29, %rhs = 127, %backedge taken 156 times 90 %rhs = add i8 %start, -100 91 br label %loop 92 93loop: 94 %iv = phi i8 [ %start, %entry ], [ %iv.inc, %loop ] 95 %iv.inc = add nsw i8 %iv, 1 96 %iv.cmp = icmp slt i8 %iv, %rhs 97 br i1 %iv.cmp, label %loop, label %leave 98 99 100leave: 101 ret void 102} 103 104define void @s_2(i8 %start) { 105; 106; CHECK-LABEL: 's_2' 107; CHECK-NEXT: Determining loop execution counts for: @s_2 108; CHECK-NEXT: Loop %loop: backedge-taken count is ((-1 * ((-100 + %start) smin %start)) + %start) 109; CHECK-NEXT: Loop %loop: constant max backedge-taken count is i8 -1 110; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is ((-1 * ((-100 + %start) smin %start)) + %start) 111; CHECK-NEXT: Loop %loop: Trip multiple is 1 112; 113entry: 114 %rhs = add i8 %start, -100 115 br label %loop 116 117loop: 118 %iv = phi i8 [ %start, %entry ], [ %iv.inc, %loop ] 119 %iv.inc = add nsw i8 %iv, -1 120 %iv.cmp = icmp sgt i8 %iv, %rhs 121 br i1 %iv.cmp, label %loop, label %leave 122 123 124leave: 125 ret void 126} 127