1; RUN: opt -S -passes=licm -o - %s | FileCheck %s 2; 3; Be sure that we don't hoist loads incorrectly if a loop has conditional UB. 4; See PR36228. 5 6declare void @check(i8) 7declare void @llvm.memcpy.p0.p0.i64(ptr, ptr, i64, i32, i1) 8 9; CHECK-LABEL: define void @buggy 10define void @buggy(ptr %src, ptr %kOne) { 11entry: 12 %dst = alloca [1 x i8], align 1 13 store i8 42, ptr %dst, align 1 14 %srcval = load i16, ptr %src 15 br label %while.cond 16 17while.cond: ; preds = %if.end, %entry 18 %dp.0 = phi ptr [ %dst, %entry ], [ %dp.1, %if.end ] 19 %0 = load volatile i1, ptr %kOne, align 4 20 br i1 %0, label %if.else, label %if.then 21 22if.then: ; preds = %while.cond 23 store i8 9, ptr %dp.0, align 1 24 br label %if.end 25 26if.else: ; preds = %while.cond 27 call void @llvm.memcpy.p0.p0.i64(ptr %dp.0, ptr %src, i64 2, i32 1, i1 false) 28 %dp.new = getelementptr inbounds i8, ptr %dp.0, i64 1 29 br label %if.end 30 31if.end: ; preds = %if.else, %if.then 32 %dp.1 = phi ptr [ %dp.0, %if.then ], [ %dp.new, %if.else ] 33 ; CHECK: %1 = load i8, ptr %dst 34 %1 = load i8, ptr %dst, align 1 35 ; CHECK-NEXT: call void @check(i8 %1) 36 call void @check(i8 %1) 37 br label %while.cond 38} 39