| ; RUN: opt < %s -lcssa -loop-unroll -S | FileCheck %s |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| ; PR28272 |
| ; When LoopSimplify separates nested loops, it might break LCSSA form: values |
| ; from the original loop might be used in the outer loop. This test invokes |
| ; loop-unroll, which calls loop-simplify before itself. If LCSSA is broken |
| ; after loop-simplify, we crash on assertion. |
| |
| ; CHECK-LABEL: @foo |
| define void @foo() { |
| entry: |
| br label %header |
| |
| header: |
| br label %loop1 |
| |
| loop1: |
| br i1 true, label %loop1, label %bb43 |
| |
| bb43: |
| %a = phi i32 [ undef, %loop1 ], [ 0, %bb45 ], [ %a, %bb54 ] |
| %b = phi i32 [ 0, %loop1 ], [ 1, %bb54 ], [ %c, %bb45 ] |
| br i1 true, label %bb114, label %header |
| |
| bb114: |
| %c = add i32 0, 1 |
| %d = add i32 0, 1 |
| br i1 true, label %bb45, label %bb54 |
| |
| bb45: |
| %x = add i32 %d, 0 |
| br label %bb43 |
| |
| bb54: |
| br label %bb43 |
| } |
| |
| ; CHECK-LABEL: @foo2 |
| define void @foo2() { |
| entry: |
| br label %outer |
| |
| outer.loopexit: |
| br label %outer |
| |
| outer: |
| br label %loop1 |
| |
| loop1: |
| br i1 true, label %loop1, label %loop2.preheader |
| |
| loop2.preheader: |
| %a.ph = phi i32 [ undef, %loop1 ] |
| %b.ph = phi i32 [ 0, %loop1 ] |
| br label %loop2 |
| |
| loop2: |
| %a = phi i32 [ 0, %loop2.if.true ], [ %a, %loop2.if.false ], [ %a.ph, %loop2.preheader ], [0, %bb] |
| %b = phi i32 [ 1, %loop2.if.false ], [ %c, %loop2.if.true ], [ %b.ph, %loop2.preheader ], [%c, %bb] |
| br i1 true, label %loop2.if, label %outer.loopexit |
| |
| loop2.if: |
| %c = add i32 0, 1 |
| switch i32 undef, label %loop2.if.false [i32 0, label %loop2.if.true |
| i32 1, label %bb] |
| |
| loop2.if.true: |
| br i1 undef, label %loop2, label %bb |
| |
| loop2.if.false: |
| br label %loop2 |
| |
| bb: |
| br label %loop2 |
| } |