| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -passes='loop-mssa(loop-instsimplify,loop-simplifycfg,simple-loop-unswitch)' -S %s | FileCheck %s |
| |
| ; Test case from PR54023. After SimpleLoopUnswitch, one of the loops processed |
| ; by LoopSimplifyCFG will have exit blocks with predecessors outside the loop |
| ; (i.e. it is not in loop-simplify/canonical form). |
| define i32 @test(i32 %v, i1 %c.1, i1 %c.2) { |
| ; CHECK-LABEL: @test( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[OUTER_HEADER:%.*]] |
| ; CHECK: outer.header: |
| ; CHECK-NEXT: br i1 [[C_1:%.*]], label [[OUTER_LATCH:%.*]], label [[INNER_HEADER_PREHEADER:%.*]] |
| ; CHECK: inner.header.preheader: |
| ; CHECK-NEXT: br label [[INNER_HEADER:%.*]] |
| ; CHECK: inner.header: |
| ; CHECK-NEXT: [[CMP_2:%.*]] = icmp ne i32 [[V:%.*]], 0 |
| ; CHECK-NEXT: br i1 [[CMP_2]], label [[EXIT:%.*]], label [[INNER_LATCH:%.*]] |
| ; CHECK: inner.latch: |
| ; CHECK-NEXT: br i1 [[C_2:%.*]], label [[OUTER_LATCH_LOOPEXIT:%.*]], label [[INNER_HEADER]] |
| ; CHECK: outer.latch.loopexit: |
| ; CHECK-NEXT: br label [[OUTER_LATCH]] |
| ; CHECK: outer.latch: |
| ; CHECK-NEXT: br label [[OUTER_HEADER]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: [[RES:%.*]] = phi i32 [ [[V]], [[INNER_HEADER]] ] |
| ; CHECK-NEXT: br label [[EXIT_SPLIT:%.*]] |
| ; CHECK: exit.split: |
| ; CHECK-NEXT: [[RES_SPLIT:%.*]] = phi i32 [ [[RES]], [[EXIT]] ] |
| ; CHECK-NEXT: ret i32 [[RES_SPLIT]] |
| ; |
| entry: |
| br label %outer.header |
| |
| outer.header: |
| %g.0 = phi i32 [ 10, %outer.latch ], [ 1, %entry ] |
| %cmp.1 = icmp eq i32 %g.0, 0 |
| br i1 %c.1, label %outer.latch, label %inner.header |
| |
| inner.header: |
| %cmp.2 = icmp ne i32 %v, 0 |
| %or.cond = or i1 %cmp.1, %cmp.2 |
| br i1 %or.cond, label %exit, label %inner.latch |
| |
| inner.latch: |
| br i1 %c.2, label %outer.latch, label %inner.header |
| |
| outer.latch: |
| br label %outer.header |
| |
| exit: |
| %res = phi i32 [ %v, %inner.header ] |
| ret i32 %res |
| } |