1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -indvars -S | FileCheck %s 3; RUN: opt < %s -passes=indvars -S | FileCheck %s 4 5define void @test_signed(i32 %start) { 6; CHECK-LABEL: @test_signed( 7; CHECK-NEXT: entry: 8; CHECK-NEXT: [[COND:%.*]] = icmp ne i32 [[START:%.*]], -2147483648 9; CHECK-NEXT: br i1 [[COND]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]] 10; CHECK: loop.preheader: 11; CHECK-NEXT: br label [[LOOP:%.*]] 12; CHECK: loop: 13; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[GUARDED:%.*]] ], [ [[START]], [[LOOP_PREHEADER]] ] 14; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1 15; CHECK-NEXT: [[CHECK:%.*]] = icmp slt i32 [[IV_NEXT]], [[IV]] 16; CHECK-NEXT: br i1 [[CHECK]], label [[GUARDED]], label [[FAIL:%.*]] 17; CHECK: guarded: 18; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[IV]], -2147483648 19; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] 20; CHECK: exit.loopexit: 21; CHECK-NEXT: br label [[EXIT]] 22; CHECK: exit: 23; CHECK-NEXT: ret void 24; CHECK: fail: 25; CHECK-NEXT: unreachable 26; 27entry: 28 %cond = icmp ne i32 %start, -2147483648 29 br i1 %cond, label %loop, label %exit 30 31loop: 32 %iv = phi i32 [%start, %entry], [%iv.next, %guarded] 33 %iv.next = add i32 %iv, -1 34 %check = icmp slt i32 %iv.next, %iv 35 br i1 %check, label %guarded, label %fail 36 37guarded: 38 %loop.cond = icmp ne i32 %iv, -2147483648 39 br i1 %loop.cond, label %loop, label %exit 40 41exit: 42 ret void 43 44fail: 45 unreachable 46} 47 48define void @test_unsigned(i32 %start) { 49; CHECK-LABEL: @test_unsigned( 50; CHECK-NEXT: entry: 51; CHECK-NEXT: [[COND:%.*]] = icmp ne i32 [[START:%.*]], 0 52; CHECK-NEXT: br i1 [[COND]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]] 53; CHECK: loop.preheader: 54; CHECK-NEXT: br label [[LOOP:%.*]] 55; CHECK: loop: 56; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[GUARDED:%.*]] ], [ [[START]], [[LOOP_PREHEADER]] ] 57; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1 58; CHECK-NEXT: [[CHECK:%.*]] = icmp ult i32 [[IV_NEXT]], [[IV]] 59; CHECK-NEXT: br i1 [[CHECK]], label [[GUARDED]], label [[FAIL:%.*]] 60; CHECK: guarded: 61; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[IV]], 0 62; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] 63; CHECK: exit.loopexit: 64; CHECK-NEXT: br label [[EXIT]] 65; CHECK: exit: 66; CHECK-NEXT: ret void 67; CHECK: fail: 68; CHECK-NEXT: unreachable 69; 70entry: 71 %cond = icmp ne i32 %start, 0 72 br i1 %cond, label %loop, label %exit 73 74loop: 75 %iv = phi i32 [%start, %entry], [%iv.next, %guarded] 76 %iv.next = add i32 %iv, -1 77 %check = icmp ult i32 %iv.next, %iv 78 br i1 %check, label %guarded, label %fail 79 80guarded: 81 %loop.cond = icmp ne i32 %iv, 0 82 br i1 %loop.cond, label %loop, label %exit 83 84exit: 85 ret void 86 87fail: 88 unreachable 89} 90