54 lines · plain
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt -passes='loop-mssa(loop-instsimplify,loop-simplifycfg,simple-loop-unswitch)' -S %s | FileCheck %s3 4; Test case from PR54023. After SimpleLoopUnswitch, one of the loops processed5; by LoopSimplifyCFG will have exit blocks with predecessors outside the loop6; (i.e. it is not in loop-simplify/canonical form).7define i32 @test(i32 %v, i1 %c.1, i1 %c.2) {8; CHECK-LABEL: @test(9; CHECK-NEXT: entry:10; CHECK-NEXT: br label [[OUTER_HEADER:%.*]]11; CHECK: outer.header:12; CHECK-NEXT: br i1 [[C_1:%.*]], label [[OUTER_LATCH:%.*]], label [[INNER_HEADER_PREHEADER:%.*]]13; CHECK: inner.header.preheader:14; CHECK-NEXT: br label [[INNER_HEADER:%.*]]15; CHECK: inner.header:16; CHECK-NEXT: [[CMP_2:%.*]] = icmp ne i32 [[V:%.*]], 017; CHECK-NEXT: br i1 [[CMP_2]], label [[EXIT:%.*]], label [[INNER_LATCH:%.*]]18; CHECK: inner.latch:19; CHECK-NEXT: br i1 [[C_2:%.*]], label [[OUTER_LATCH_LOOPEXIT:%.*]], label [[INNER_HEADER]]20; CHECK: outer.latch.loopexit:21; CHECK-NEXT: br label [[OUTER_LATCH]]22; CHECK: outer.latch:23; CHECK-NEXT: br label [[OUTER_HEADER]]24; CHECK: exit:25; CHECK-NEXT: [[RES:%.*]] = phi i32 [ [[V]], [[INNER_HEADER]] ]26; CHECK-NEXT: br label [[EXIT_SPLIT:%.*]]27; CHECK: exit.split:28; CHECK-NEXT: [[RES_SPLIT:%.*]] = phi i32 [ [[RES]], [[EXIT]] ]29; CHECK-NEXT: ret i32 [[RES_SPLIT]]30;31entry:32 br label %outer.header33 34outer.header:35 %g.0 = phi i32 [ 10, %outer.latch ], [ 1, %entry ]36 %cmp.1 = icmp eq i32 %g.0, 037 br i1 %c.1, label %outer.latch, label %inner.header38 39inner.header:40 %cmp.2 = icmp ne i32 %v, 041 %or.cond = or i1 %cmp.1, %cmp.242 br i1 %or.cond, label %exit, label %inner.latch43 44inner.latch:45 br i1 %c.2, label %outer.latch, label %inner.header46 47outer.latch:48 br label %outer.header49 50exit:51 %res = phi i32 [ %v, %inner.header ]52 ret i32 %res53}54