| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -S -dfa-jump-threading %s | FileCheck %s |
| |
| ; These tests check if selects are unfolded properly for jump threading |
| ; opportunities. There are three different patterns to consider: |
| ; 1) Both operands are constant and the false branch is unfolded by default |
| ; 2) One operand is constant and the other is another select to be unfolded. In |
| ; this case a single select is sunk to a new block to unfold. |
| ; 3) Both operands are a select, and both should be sunk to new blocks. |
| define i32 @test1(i32 %num) { |
| ; CHECK-LABEL: @test1( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[FOR_BODY:%.*]] |
| ; CHECK: for.body: |
| ; CHECK-NEXT: [[COUNT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ] |
| ; CHECK-NEXT: [[STATE:%.*]] = phi i32 [ 1, [[ENTRY]] ], [ undef, [[FOR_INC]] ] |
| ; CHECK-NEXT: switch i32 [[STATE]], label [[FOR_INC_JT1:%.*]] [ |
| ; CHECK-NEXT: i32 1, label [[CASE1:%.*]] |
| ; CHECK-NEXT: i32 2, label [[CASE2:%.*]] |
| ; CHECK-NEXT: ] |
| ; CHECK: for.body.jt2: |
| ; CHECK-NEXT: [[COUNT_JT2:%.*]] = phi i32 [ [[INC_JT2:%.*]], [[FOR_INC_JT2:%.*]] ] |
| ; CHECK-NEXT: [[STATE_JT2:%.*]] = phi i32 [ [[STATE_NEXT_JT2:%.*]], [[FOR_INC_JT2]] ] |
| ; CHECK-NEXT: br label [[CASE2]] |
| ; CHECK: for.body.jt1: |
| ; CHECK-NEXT: [[COUNT_JT1:%.*]] = phi i32 [ [[INC_JT1:%.*]], [[FOR_INC_JT1]] ] |
| ; CHECK-NEXT: [[STATE_JT1:%.*]] = phi i32 [ [[STATE_NEXT_JT1:%.*]], [[FOR_INC_JT1]] ] |
| ; CHECK-NEXT: br label [[CASE1]] |
| ; CHECK: case1: |
| ; CHECK-NEXT: [[COUNT2:%.*]] = phi i32 [ [[COUNT_JT1]], [[FOR_BODY_JT1:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ] |
| ; CHECK-NEXT: br label [[FOR_INC_JT2]] |
| ; CHECK: case2: |
| ; CHECK-NEXT: [[COUNT1:%.*]] = phi i32 [ [[COUNT_JT2]], [[FOR_BODY_JT2:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ] |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[COUNT1]], 50 |
| ; CHECK-NEXT: br i1 [[CMP]], label [[FOR_INC_JT1]], label [[SI_UNFOLD_FALSE:%.*]] |
| ; CHECK: si.unfold.false: |
| ; CHECK-NEXT: br label [[FOR_INC_JT2]] |
| ; CHECK: for.inc: |
| ; CHECK-NEXT: [[INC]] = add nsw i32 undef, 1 |
| ; CHECK-NEXT: [[CMP_EXIT:%.*]] = icmp slt i32 [[INC]], [[NUM:%.*]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT]], label [[FOR_BODY]], label [[FOR_END:%.*]] |
| ; CHECK: for.inc.jt2: |
| ; CHECK-NEXT: [[COUNT4:%.*]] = phi i32 [ [[COUNT1]], [[SI_UNFOLD_FALSE]] ], [ [[COUNT2]], [[CASE1]] ] |
| ; CHECK-NEXT: [[STATE_NEXT_JT2]] = phi i32 [ 2, [[CASE1]] ], [ 2, [[SI_UNFOLD_FALSE]] ] |
| ; CHECK-NEXT: [[INC_JT2]] = add nsw i32 [[COUNT4]], 1 |
| ; CHECK-NEXT: [[CMP_EXIT_JT2:%.*]] = icmp slt i32 [[INC_JT2]], [[NUM]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT_JT2]], label [[FOR_BODY_JT2]], label [[FOR_END]] |
| ; CHECK: for.inc.jt1: |
| ; CHECK-NEXT: [[COUNT3:%.*]] = phi i32 [ [[COUNT1]], [[CASE2]] ], [ [[COUNT]], [[FOR_BODY]] ] |
| ; CHECK-NEXT: [[STATE_NEXT_JT1]] = phi i32 [ 1, [[CASE2]] ], [ 1, [[FOR_BODY]] ] |
| ; CHECK-NEXT: [[INC_JT1]] = add nsw i32 [[COUNT3]], 1 |
| ; CHECK-NEXT: [[CMP_EXIT_JT1:%.*]] = icmp slt i32 [[INC_JT1]], [[NUM]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT_JT1]], label [[FOR_BODY_JT1]], label [[FOR_END]] |
| ; CHECK: for.end: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| br label %for.body |
| |
| for.body: |
| %count = phi i32 [ 0, %entry ], [ %inc, %for.inc ] |
| %state = phi i32 [ 1, %entry ], [ %state.next, %for.inc ] |
| switch i32 %state, label %for.inc [ |
| i32 1, label %case1 |
| i32 2, label %case2 |
| ] |
| |
| case1: |
| br label %for.inc |
| |
| case2: |
| %cmp = icmp slt i32 %count, 50 |
| %sel = select i1 %cmp, i32 1, i32 2 |
| br label %for.inc |
| |
| for.inc: |
| %state.next = phi i32 [ %sel, %case2 ], [ 1, %for.body ], [ 2, %case1 ] |
| %inc = add nsw i32 %count, 1 |
| %cmp.exit = icmp slt i32 %inc, %num |
| br i1 %cmp.exit, label %for.body, label %for.end |
| |
| for.end: |
| ret i32 0 |
| } |
| |
| define i32 @test2(i32 %num) { |
| ; CHECK-LABEL: @test2( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[FOR_BODY:%.*]] |
| ; CHECK: for.body: |
| ; CHECK-NEXT: [[COUNT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ] |
| ; CHECK-NEXT: [[STATE:%.*]] = phi i32 [ 1, [[ENTRY]] ], [ undef, [[FOR_INC]] ] |
| ; CHECK-NEXT: switch i32 [[STATE]], label [[FOR_INC_JT1:%.*]] [ |
| ; CHECK-NEXT: i32 1, label [[CASE1:%.*]] |
| ; CHECK-NEXT: i32 2, label [[CASE2:%.*]] |
| ; CHECK-NEXT: ] |
| ; CHECK: for.body.jt3: |
| ; CHECK-NEXT: [[COUNT_JT3:%.*]] = phi i32 [ [[INC_JT3:%.*]], [[FOR_INC_JT3:%.*]] ] |
| ; CHECK-NEXT: [[STATE_JT3:%.*]] = phi i32 [ [[STATE_NEXT_JT3:%.*]], [[FOR_INC_JT3]] ] |
| ; CHECK-NEXT: br label [[FOR_INC_JT1]] |
| ; CHECK: for.body.jt2: |
| ; CHECK-NEXT: [[COUNT_JT2:%.*]] = phi i32 [ [[INC_JT2:%.*]], [[FOR_INC_JT2:%.*]] ] |
| ; CHECK-NEXT: [[STATE_JT2:%.*]] = phi i32 [ [[STATE_NEXT_JT2:%.*]], [[FOR_INC_JT2]] ] |
| ; CHECK-NEXT: br label [[CASE2]] |
| ; CHECK: for.body.jt1: |
| ; CHECK-NEXT: [[COUNT_JT1:%.*]] = phi i32 [ [[INC_JT1:%.*]], [[FOR_INC_JT1]] ] |
| ; CHECK-NEXT: [[STATE_JT1:%.*]] = phi i32 [ [[STATE_NEXT_JT1:%.*]], [[FOR_INC_JT1]] ] |
| ; CHECK-NEXT: br label [[CASE1]] |
| ; CHECK: case1: |
| ; CHECK-NEXT: [[COUNT5:%.*]] = phi i32 [ [[COUNT_JT1]], [[FOR_BODY_JT1:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ] |
| ; CHECK-NEXT: [[CMP_C1:%.*]] = icmp slt i32 [[COUNT5]], 50 |
| ; CHECK-NEXT: [[CMP2_C1:%.*]] = icmp slt i32 [[COUNT5]], 100 |
| ; CHECK-NEXT: br i1 [[CMP2_C1]], label [[SI_UNFOLD_TRUE:%.*]], label [[FOR_INC_JT3]] |
| ; CHECK: case2: |
| ; CHECK-NEXT: [[COUNT3:%.*]] = phi i32 [ [[COUNT_JT2]], [[FOR_BODY_JT2:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ] |
| ; CHECK-NEXT: [[CMP_C2:%.*]] = icmp slt i32 [[COUNT3]], 50 |
| ; CHECK-NEXT: [[CMP2_C2:%.*]] = icmp sgt i32 [[COUNT3]], 100 |
| ; CHECK-NEXT: br i1 [[CMP2_C2]], label [[FOR_INC_JT3]], label [[SI_UNFOLD_FALSE:%.*]] |
| ; CHECK: si.unfold.false: |
| ; CHECK-NEXT: br i1 [[CMP_C2]], label [[FOR_INC_JT1]], label [[SI_UNFOLD_FALSE1:%.*]] |
| ; CHECK: si.unfold.false1: |
| ; CHECK-NEXT: br label [[FOR_INC_JT2]] |
| ; CHECK: si.unfold.true: |
| ; CHECK-NEXT: br i1 [[CMP_C1]], label [[FOR_INC_JT1]], label [[SI_UNFOLD_FALSE2:%.*]] |
| ; CHECK: si.unfold.false2: |
| ; CHECK-NEXT: br label [[FOR_INC_JT2]] |
| ; CHECK: for.inc: |
| ; CHECK-NEXT: [[INC]] = add nsw i32 undef, 1 |
| ; CHECK-NEXT: [[CMP_EXIT:%.*]] = icmp slt i32 [[INC]], [[NUM:%.*]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT]], label [[FOR_BODY]], label [[FOR_END:%.*]] |
| ; CHECK: for.inc.jt3: |
| ; CHECK-NEXT: [[COUNT6:%.*]] = phi i32 [ [[COUNT3]], [[CASE2]] ], [ [[COUNT5]], [[CASE1]] ] |
| ; CHECK-NEXT: [[STATE_NEXT_JT3]] = phi i32 [ 3, [[CASE1]] ], [ 3, [[CASE2]] ] |
| ; CHECK-NEXT: [[INC_JT3]] = add nsw i32 [[COUNT6]], 1 |
| ; CHECK-NEXT: [[CMP_EXIT_JT3:%.*]] = icmp slt i32 [[INC_JT3]], [[NUM]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT_JT3]], label [[FOR_BODY_JT3:%.*]], label [[FOR_END]] |
| ; CHECK: for.inc.jt2: |
| ; CHECK-NEXT: [[COUNT7:%.*]] = phi i32 [ [[COUNT3]], [[SI_UNFOLD_FALSE1]] ], [ [[COUNT5]], [[SI_UNFOLD_FALSE2]] ] |
| ; CHECK-NEXT: [[STATE_NEXT_JT2]] = phi i32 [ 2, [[SI_UNFOLD_FALSE1]] ], [ 2, [[SI_UNFOLD_FALSE2]] ] |
| ; CHECK-NEXT: [[INC_JT2]] = add nsw i32 [[COUNT7]], 1 |
| ; CHECK-NEXT: [[CMP_EXIT_JT2:%.*]] = icmp slt i32 [[INC_JT2]], [[NUM]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT_JT2]], label [[FOR_BODY_JT2]], label [[FOR_END]] |
| ; CHECK: for.inc.jt1: |
| ; CHECK-NEXT: [[COUNT4:%.*]] = phi i32 [ [[COUNT_JT3]], [[FOR_BODY_JT3]] ], [ [[COUNT3]], [[SI_UNFOLD_FALSE]] ], [ [[COUNT5]], [[SI_UNFOLD_TRUE]] ], [ [[COUNT]], [[FOR_BODY]] ] |
| ; CHECK-NEXT: [[STATE_NEXT_JT1]] = phi i32 [ 1, [[FOR_BODY]] ], [ 1, [[SI_UNFOLD_FALSE]] ], [ 1, [[SI_UNFOLD_TRUE]] ], [ 1, [[FOR_BODY_JT3]] ] |
| ; CHECK-NEXT: [[INC_JT1]] = add nsw i32 [[COUNT4]], 1 |
| ; CHECK-NEXT: [[CMP_EXIT_JT1:%.*]] = icmp slt i32 [[INC_JT1]], [[NUM]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT_JT1]], label [[FOR_BODY_JT1]], label [[FOR_END]] |
| ; CHECK: for.end: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| br label %for.body |
| |
| for.body: |
| %count = phi i32 [ 0, %entry ], [ %inc, %for.inc ] |
| %state = phi i32 [ 1, %entry ], [ %state.next, %for.inc ] |
| switch i32 %state, label %for.inc [ |
| i32 1, label %case1 |
| i32 2, label %case2 |
| ] |
| |
| case1: |
| %cmp.c1 = icmp slt i32 %count, 50 |
| %cmp2.c1 = icmp slt i32 %count, 100 |
| %state1.1 = select i1 %cmp.c1, i32 1, i32 2 |
| %state1.2 = select i1 %cmp2.c1, i32 %state1.1, i32 3 |
| br label %for.inc |
| |
| case2: |
| %cmp.c2 = icmp slt i32 %count, 50 |
| %cmp2.c2 = icmp sgt i32 %count, 100 |
| %state2.1 = select i1 %cmp.c2, i32 1, i32 2 |
| %state2.2 = select i1 %cmp2.c2, i32 3, i32 %state2.1 |
| br label %for.inc |
| |
| for.inc: |
| %state.next = phi i32 [ %state1.2, %case1 ], [ %state2.2, %case2 ], [ 1, %for.body ] |
| %inc = add nsw i32 %count, 1 |
| %cmp.exit = icmp slt i32 %inc, %num |
| br i1 %cmp.exit, label %for.body, label %for.end |
| |
| for.end: |
| ret i32 0 |
| } |
| |
| define i32 @test3(i32 %num) { |
| ; CHECK-LABEL: @test3( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[FOR_BODY:%.*]] |
| ; CHECK: for.body: |
| ; CHECK-NEXT: [[COUNT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ] |
| ; CHECK-NEXT: [[STATE:%.*]] = phi i32 [ 1, [[ENTRY]] ], [ undef, [[FOR_INC]] ] |
| ; CHECK-NEXT: switch i32 [[STATE]], label [[FOR_INC_JT1:%.*]] [ |
| ; CHECK-NEXT: i32 1, label [[CASE1:%.*]] |
| ; CHECK-NEXT: i32 2, label [[CASE2:%.*]] |
| ; CHECK-NEXT: ] |
| ; CHECK: for.body.jt4: |
| ; CHECK-NEXT: [[COUNT_JT4:%.*]] = phi i32 [ [[INC_JT4:%.*]], [[FOR_INC_JT4:%.*]] ] |
| ; CHECK-NEXT: [[STATE_JT4:%.*]] = phi i32 [ [[STATE_NEXT_JT4:%.*]], [[FOR_INC_JT4]] ] |
| ; CHECK-NEXT: br label [[FOR_INC_JT1]] |
| ; CHECK: for.body.jt3: |
| ; CHECK-NEXT: [[COUNT_JT3:%.*]] = phi i32 [ [[INC_JT3:%.*]], [[FOR_INC_JT3:%.*]] ] |
| ; CHECK-NEXT: [[STATE_JT3:%.*]] = phi i32 [ [[STATE_NEXT_JT3:%.*]], [[FOR_INC_JT3]] ] |
| ; CHECK-NEXT: br label [[FOR_INC_JT1]] |
| ; CHECK: for.body.jt2: |
| ; CHECK-NEXT: [[COUNT_JT2:%.*]] = phi i32 [ [[INC_JT2:%.*]], [[FOR_INC_JT2:%.*]] ] |
| ; CHECK-NEXT: [[STATE_JT2:%.*]] = phi i32 [ [[STATE_NEXT_JT2:%.*]], [[FOR_INC_JT2]] ] |
| ; CHECK-NEXT: br label [[CASE2]] |
| ; CHECK: for.body.jt1: |
| ; CHECK-NEXT: [[COUNT_JT1:%.*]] = phi i32 [ [[INC_JT1:%.*]], [[FOR_INC_JT1]] ] |
| ; CHECK-NEXT: [[STATE_JT1:%.*]] = phi i32 [ [[STATE_NEXT_JT1:%.*]], [[FOR_INC_JT1]] ] |
| ; CHECK-NEXT: br label [[CASE1]] |
| ; CHECK: case1: |
| ; CHECK-NEXT: [[COUNT5:%.*]] = phi i32 [ [[COUNT_JT1]], [[FOR_BODY_JT1:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ] |
| ; CHECK-NEXT: br label [[FOR_INC_JT2]] |
| ; CHECK: case2: |
| ; CHECK-NEXT: [[COUNT4:%.*]] = phi i32 [ [[COUNT_JT2]], [[FOR_BODY_JT2:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ] |
| ; CHECK-NEXT: [[CMP_1:%.*]] = icmp slt i32 [[COUNT4]], 50 |
| ; CHECK-NEXT: [[CMP_2:%.*]] = icmp slt i32 [[COUNT4]], 100 |
| ; CHECK-NEXT: [[TMP0:%.*]] = and i32 [[COUNT4]], 1 |
| ; CHECK-NEXT: [[CMP_3:%.*]] = icmp eq i32 [[TMP0]], 0 |
| ; CHECK-NEXT: br i1 [[CMP_3]], label [[SI_UNFOLD_TRUE:%.*]], label [[SI_UNFOLD_FALSE:%.*]] |
| ; CHECK: si.unfold.true: |
| ; CHECK-NEXT: br i1 [[CMP_1]], label [[FOR_INC_JT1]], label [[SI_UNFOLD_FALSE2:%.*]] |
| ; CHECK: si.unfold.false: |
| ; CHECK-NEXT: br i1 [[CMP_2]], label [[FOR_INC_JT3]], label [[SI_UNFOLD_FALSE1:%.*]] |
| ; CHECK: si.unfold.false1: |
| ; CHECK-NEXT: br label [[FOR_INC_JT4]] |
| ; CHECK: si.unfold.false2: |
| ; CHECK-NEXT: br label [[FOR_INC_JT2]] |
| ; CHECK: for.inc: |
| ; CHECK-NEXT: [[INC]] = add nsw i32 undef, 1 |
| ; CHECK-NEXT: [[CMP_EXIT:%.*]] = icmp slt i32 [[INC]], [[NUM:%.*]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT]], label [[FOR_BODY]], label [[FOR_END:%.*]] |
| ; CHECK: for.inc.jt4: |
| ; CHECK-NEXT: [[STATE_NEXT_JT4]] = phi i32 [ 4, [[SI_UNFOLD_FALSE1]] ] |
| ; CHECK-NEXT: [[INC_JT4]] = add nsw i32 [[COUNT4]], 1 |
| ; CHECK-NEXT: [[CMP_EXIT_JT4:%.*]] = icmp slt i32 [[INC_JT4]], [[NUM]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT_JT4]], label [[FOR_BODY_JT4:%.*]], label [[FOR_END]] |
| ; CHECK: for.inc.jt3: |
| ; CHECK-NEXT: [[STATE_NEXT_JT3]] = phi i32 [ 3, [[SI_UNFOLD_FALSE]] ] |
| ; CHECK-NEXT: [[INC_JT3]] = add nsw i32 [[COUNT4]], 1 |
| ; CHECK-NEXT: [[CMP_EXIT_JT3:%.*]] = icmp slt i32 [[INC_JT3]], [[NUM]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT_JT3]], label [[FOR_BODY_JT3:%.*]], label [[FOR_END]] |
| ; CHECK: for.inc.jt2: |
| ; CHECK-NEXT: [[COUNT6:%.*]] = phi i32 [ [[COUNT4]], [[SI_UNFOLD_FALSE2]] ], [ [[COUNT5]], [[CASE1]] ] |
| ; CHECK-NEXT: [[STATE_NEXT_JT2]] = phi i32 [ 2, [[CASE1]] ], [ 2, [[SI_UNFOLD_FALSE2]] ] |
| ; CHECK-NEXT: [[INC_JT2]] = add nsw i32 [[COUNT6]], 1 |
| ; CHECK-NEXT: [[CMP_EXIT_JT2:%.*]] = icmp slt i32 [[INC_JT2]], [[NUM]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT_JT2]], label [[FOR_BODY_JT2]], label [[FOR_END]] |
| ; CHECK: for.inc.jt1: |
| ; CHECK-NEXT: [[COUNT3:%.*]] = phi i32 [ [[COUNT_JT4]], [[FOR_BODY_JT4]] ], [ [[COUNT_JT3]], [[FOR_BODY_JT3]] ], [ [[COUNT4]], [[SI_UNFOLD_TRUE]] ], [ [[COUNT]], [[FOR_BODY]] ] |
| ; CHECK-NEXT: [[STATE_NEXT_JT1]] = phi i32 [ 1, [[FOR_BODY]] ], [ 1, [[SI_UNFOLD_TRUE]] ], [ 1, [[FOR_BODY_JT3]] ], [ 1, [[FOR_BODY_JT4]] ] |
| ; CHECK-NEXT: [[INC_JT1]] = add nsw i32 [[COUNT3]], 1 |
| ; CHECK-NEXT: [[CMP_EXIT_JT1:%.*]] = icmp slt i32 [[INC_JT1]], [[NUM]] |
| ; CHECK-NEXT: br i1 [[CMP_EXIT_JT1]], label [[FOR_BODY_JT1]], label [[FOR_END]] |
| ; CHECK: for.end: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| br label %for.body |
| |
| for.body: |
| %count = phi i32 [ 0, %entry ], [ %inc, %for.inc ] |
| %state = phi i32 [ 1, %entry ], [ %state.next, %for.inc ] |
| switch i32 %state, label %for.inc [ |
| i32 1, label %case1 |
| i32 2, label %case2 |
| ] |
| |
| case1: |
| br label %for.inc |
| |
| case2: |
| %cmp.1 = icmp slt i32 %count, 50 |
| %cmp.2 = icmp slt i32 %count, 100 |
| %0 = and i32 %count, 1 |
| %cmp.3 = icmp eq i32 %0, 0 |
| %sel.1 = select i1 %cmp.1, i32 1, i32 2 |
| %sel.2 = select i1 %cmp.2, i32 3, i32 4 |
| %sel.3 = select i1 %cmp.3, i32 %sel.1, i32 %sel.2 |
| br label %for.inc |
| |
| for.inc: |
| %state.next = phi i32 [ %sel.3, %case2 ], [ 1, %for.body ], [ 2, %case1 ] |
| %inc = add nsw i32 %count, 1 |
| %cmp.exit = icmp slt i32 %inc, %num |
| br i1 %cmp.exit, label %for.body, label %for.end |
| |
| for.end: |
| ret i32 0 |
| } |