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1; RUN: llc -fast-isel=true -O1 -mtriple=x86_64-unknown-linux-gnu -start-before=codegenprepare -stop-after=codegenprepare -o - < %s | FileCheck %s2 3; CHECK-LABEL: @foo4define void @foo() {5top:6; CHECK: br label %L347 br label %L348 9L34: ; preds = %L34, %L34, %top10 %.sroa.075.0 = phi i64 [ undef, %top ], [ undef, %L34 ], [ undef, %L34 ]11 %0 = icmp sgt i8 undef, -112 %cond5896 = icmp eq i8 0, 213 %cond58 = and i1 %cond5896, %014; During codegenprepare such degenerate branches can occur and should not15; lead to crashes.16; CHECK: br label %L3417 br i1 %cond58, label %L34, label %L3418}19