| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -indvars -S | FileCheck %s |
| ; RUN: opt < %s -passes=indvars -S | FileCheck %s |
| |
| define void @test_signed(i32 %start) { |
| ; CHECK-LABEL: @test_signed( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[COND:%.*]] = icmp ne i32 [[START:%.*]], -2147483648 |
| ; CHECK-NEXT: br i1 [[COND]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]] |
| ; CHECK: loop.preheader: |
| ; CHECK-NEXT: br label [[LOOP:%.*]] |
| ; CHECK: loop: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[GUARDED:%.*]] ], [ [[START]], [[LOOP_PREHEADER]] ] |
| ; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1 |
| ; CHECK-NEXT: [[CHECK:%.*]] = icmp slt i32 [[IV_NEXT]], [[IV]] |
| ; CHECK-NEXT: br i1 [[CHECK]], label [[GUARDED]], label [[FAIL:%.*]] |
| ; CHECK: guarded: |
| ; CHECK-NEXT: br i1 true, label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] |
| ; CHECK: exit.loopexit: |
| ; CHECK-NEXT: br label [[EXIT]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: ret void |
| ; CHECK: fail: |
| ; CHECK-NEXT: unreachable |
| ; |
| entry: |
| %cond = icmp ne i32 %start, -2147483648 |
| br i1 %cond, label %loop, label %exit |
| |
| loop: |
| %iv = phi i32 [%start, %entry], [%iv.next, %guarded] |
| %iv.next = add i32 %iv, -1 |
| %check = icmp slt i32 %iv.next, %iv |
| br i1 %check, label %guarded, label %fail |
| |
| guarded: |
| %loop.cond = icmp ne i32 %iv, -2147483648 |
| br i1 %loop.cond, label %loop, label %exit |
| |
| exit: |
| ret void |
| |
| fail: |
| unreachable |
| } |
| |
| define void @test_unsigned(i32 %start) { |
| ; CHECK-LABEL: @test_unsigned( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[COND:%.*]] = icmp ne i32 [[START:%.*]], 0 |
| ; CHECK-NEXT: br i1 [[COND]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]] |
| ; CHECK: loop.preheader: |
| ; CHECK-NEXT: br label [[LOOP:%.*]] |
| ; CHECK: loop: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[GUARDED:%.*]] ], [ [[START]], [[LOOP_PREHEADER]] ] |
| ; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1 |
| ; CHECK-NEXT: [[CHECK:%.*]] = icmp ult i32 [[IV_NEXT]], [[IV]] |
| ; CHECK-NEXT: br i1 [[CHECK]], label [[GUARDED]], label [[FAIL:%.*]] |
| ; CHECK: guarded: |
| ; CHECK-NEXT: br i1 true, label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] |
| ; CHECK: exit.loopexit: |
| ; CHECK-NEXT: br label [[EXIT]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: ret void |
| ; CHECK: fail: |
| ; CHECK-NEXT: unreachable |
| ; |
| entry: |
| %cond = icmp ne i32 %start, 0 |
| br i1 %cond, label %loop, label %exit |
| |
| loop: |
| %iv = phi i32 [%start, %entry], [%iv.next, %guarded] |
| %iv.next = add i32 %iv, -1 |
| %check = icmp ult i32 %iv.next, %iv |
| br i1 %check, label %guarded, label %fail |
| |
| guarded: |
| %loop.cond = icmp ne i32 %iv, 0 |
| br i1 %loop.cond, label %loop, label %exit |
| |
| exit: |
| ret void |
| |
| fail: |
| unreachable |
| } |