1; RUN: opt < %s -scalar-evolution -analyze | FileCheck %s 2 3define void @test1(i32 %n) { 4entry: 5 %s = mul i32 %n, 96 6 br label %loop 7loop: 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 12exit: 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 21define i32 @test2(i32 %n) { 22entry: 23 %s = and i32 %n, -32 24 br label %loop 25loop: 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 30exit: 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 38define void @test3(i32 %n) { 39entry: 40 %s = mul i32 %n, 96 41 br label %loop 42loop: 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 47exit: 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 55define void @test4(i32 %n) { 56entry: 57 %s = mul i32 %n, 4 58 br label %loop 59loop: 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 64exit: 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 72define void @test5(i32 %n) { 73entry: 74 %s = mul i32 %n, 4 75 br label %loop 76loop: 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 81exit: 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