1 ; RUN: opt < %s -gvn -simplifycfg -adce | llvm-dis 2 ; RUN: opt < %s -gvn -simplifycfg -adce -verify-dom-info | llvm-dis 3 4 ; This test makes sure that the DominatorTree properly handles 5 ; deletion of edges that go to forward-unreachable regions. 6 ; In this case, %land.end is already forward unreachable when 7 ; the DT gets informed about the deletion of %entry -> %land.end. 8 9 @a = common global i32 0, align 4 10 11 define i32 @main() { 12 entry: 13 %retval = alloca i32, align 4 14 store i32 0, i32* %retval, align 4 15 %0 = load i32, i32* @a, align 4 16 %cmp = icmp ne i32 %0, 1 17 br i1 %cmp, label %land.rhs, label %land.end4 18 19 land.rhs: ; preds = %entry 20 %1 = load i32, i32* @a, align 4 21 %tobool = icmp ne i32 %1, 0 22 br i1 %tobool, label %land.rhs1, label %land.end 23 24 land.rhs1: ; preds = %land.rhs 25 br label %land.end 26 27 land.end: ; preds = %land.rhs1, %land.rhs 28 %2 = phi i1 [ false, %land.rhs ], [ true, %land.rhs1 ] 29 %land.ext = zext i1 %2 to i32 30 %conv = trunc i32 %land.ext to i16 31 %conv2 = sext i16 %conv to i32 32 %tobool3 = icmp ne i32 %conv2, 0 33 br label %land.end4 34 35 land.end4: ; preds = %land.end, %entry 36 %3 = phi i1 [ false, %entry ], [ %tobool3, %land.end ] 37 %land.ext5 = zext i1 %3 to i32 38 ret i32 0 39 } 40
