39 lines · plain
1; RUN: opt -S -passes=licm -o - %s | FileCheck %s2;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 @buggy10define void @buggy(ptr %src, ptr %kOne) {11entry:12 %dst = alloca [1 x i8], align 113 store i8 42, ptr %dst, align 114 %srcval = load i16, ptr %src15 br label %while.cond16 17while.cond: ; preds = %if.end, %entry18 %dp.0 = phi ptr [ %dst, %entry ], [ %dp.1, %if.end ]19 %0 = load volatile i1, ptr %kOne, align 420 br i1 %0, label %if.else, label %if.then21 22if.then: ; preds = %while.cond23 store i8 9, ptr %dp.0, align 124 br label %if.end25 26if.else: ; preds = %while.cond27 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 129 br label %if.end30 31if.end: ; preds = %if.else, %if.then32 %dp.1 = phi ptr [ %dp.0, %if.then ], [ %dp.new, %if.else ]33 ; CHECK: %1 = load i8, ptr %dst34 %1 = load i8, ptr %dst, align 135 ; CHECK-NEXT: call void @check(i8 %1)36 call void @check(i8 %1)37 br label %while.cond38}39