1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -gvn -S | FileCheck %s 3 4; This test checks that we don't hang trying to split a critical edge in scalar 5; PRE when the control flow uses a callbr instruction. 6 7define void @wombat(i64 %arg, i64* %arg1, i64 %arg2, i32* %arg3) { 8; CHECK-LABEL: @wombat( 9; CHECK-NEXT: bb: 10; CHECK-NEXT: [[TMP5:%.*]] = or i64 [[ARG2:%.*]], [[ARG:%.*]] 11; CHECK-NEXT: callbr void asm sideeffect "", "X,X"(i8* blockaddress(@wombat, [[BB7:%.*]]), i8* blockaddress(@wombat, [[BB9:%.*]])) 12; CHECK-NEXT: to label [[BB6:%.*]] [label [[BB7]], label %bb9] 13; CHECK: bb6: 14; CHECK-NEXT: br label [[BB7]] 15; CHECK: bb7: 16; CHECK-NEXT: [[TMP8:%.*]] = trunc i64 [[TMP5]] to i32 17; CHECK-NEXT: tail call void @barney(i32 [[TMP8]]) 18; CHECK-NEXT: br label [[BB9]] 19; CHECK: bb9: 20; CHECK-NEXT: [[TMP10:%.*]] = trunc i64 [[TMP5]] to i32 21; CHECK-NEXT: store i32 [[TMP10]], i32* [[ARG3:%.*]] 22; CHECK-NEXT: ret void 23; 24bb: 25 %tmp5 = or i64 %arg2, %arg 26 callbr void asm sideeffect "", "X,X"(i8* blockaddress(@wombat, %bb7), i8* blockaddress(@wombat, %bb9)) 27 to label %bb6 [label %bb7, label %bb9] 28 29bb6: ; preds = %bb 30 br label %bb7 31 32bb7: ; preds = %bb6, %bb 33 %tmp8 = trunc i64 %tmp5 to i32 34 tail call void @barney(i32 %tmp8) 35 br label %bb9 36 37bb9: ; preds = %bb7, %bb 38 %tmp10 = trunc i64 %tmp5 to i32 39 store i32 %tmp10, i32* %arg3 40 ret void 41} 42 43declare void @barney(i32) 44