1 ; RUN: opt < %s -scalar-evolution -analyze | FileCheck %s 2 3 define void @test1(i32 %n) { 4 entry: 5 %s = mul i32 %n, 96 6 br label %loop 7 loop: 8 %i = phi i32 [ 0, %entry ], [ %i.next, %loop ] 9 %i.next = add i32 %i, 32 10 %t = icmp ne i32 %i.next, %s 11 br i1 %t, label %loop, label %exit 12 exit: 13 ret void 14 15 ; CHECK-LABEL: @test1 16 ; CHECK: Loop %loop: backedge-taken count is ((-32 + (96 * %n)) /u 32) 17 ; CHECK: Loop %loop: max backedge-taken count is 134217727 18 } 19 20 ; PR19183 21 define i32 @test2(i32 %n) { 22 entry: 23 %s = and i32 %n, -32 24 br label %loop 25 loop: 26 %i = phi i32 [ 0, %entry ], [ %i.next, %loop ] 27 %i.next = add i32 %i, 32 28 %t = icmp ne i32 %i.next, %s 29 br i1 %t, label %loop, label %exit 30 exit: 31 ret i32 %i 32 33 ; CHECK-LABEL: @test2 34 ; CHECK: Loop %loop: backedge-taken count is ((-32 + (32 * (%n /u 32))<nuw>) /u 32) 35 ; CHECK: Loop %loop: max backedge-taken count is 134217727 36 } 37 38 define void @test3(i32 %n) { 39 entry: 40 %s = mul i32 %n, 96 41 br label %loop 42 loop: 43 %i = phi i32 [ 0, %entry ], [ %i.next, %loop ] 44 %i.next = add i32 %i, 96 45 %t = icmp ne i32 %i.next, %s 46 br i1 %t, label %loop, label %exit 47 exit: 48 ret void 49 50 ; CHECK-LABEL: @test3 51 ; CHECK: Loop %loop: backedge-taken count is ((-32 + (32 * %n)) /u 32) 52 ; CHECK: Loop %loop: max backedge-taken count is 134217727 53 } 54 55 define void @test4(i32 %n) { 56 entry: 57 %s = mul i32 %n, 4 58 br label %loop 59 loop: 60 %i = phi i32 [ 0, %entry ], [ %i.next, %loop ] 61 %i.next = add i32 %i, 12 62 %t = icmp ne i32 %i.next, %s 63 br i1 %t, label %loop, label %exit 64 exit: 65 ret void 66 67 ; CHECK-LABEL: @test4 68 ; CHECK: Loop %loop: backedge-taken count is ((-4 + (-1431655764 * %n)) /u 4) 69 ; CHECK: Loop %loop: max backedge-taken count is 1073741823 70 } 71 72 define void @test5(i32 %n) { 73 entry: 74 %s = mul i32 %n, 4 75 br label %loop 76 loop: 77 %i = phi i32 [ %s, %entry ], [ %i.next, %loop ] 78 %i.next = add i32 %i, -4 79 %t = icmp ne i32 %i.next, 0 80 br i1 %t, label %loop, label %exit 81 exit: 82 ret void 83 84 ; CHECK-LABEL: @test5 85 ; CHECK: Loop %loop: backedge-taken count is ((-4 + (4 * %n)) /u 4) 86 ; CHECK: Loop %loop: max backedge-taken count is 1073741823 87 } 88
