| ; RUN: opt -S -licm -o - %s | FileCheck %s |
| ; |
| ; Be sure that we don't hoist loads incorrectly if a loop has conditional UB. |
| ; See PR36228. |
| |
| declare void @check(i8) |
| declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i32, i1) |
| |
| ; CHECK-LABEL: define void @buggy |
| define void @buggy(i8* %src, i1* %kOne) { |
| entry: |
| %dst = alloca [1 x i8], align 1 |
| %0 = getelementptr inbounds [1 x i8], [1 x i8]* %dst, i64 0, i64 0 |
| store i8 42, i8* %0, align 1 |
| %src16 = bitcast i8* %src to i16* |
| %srcval = load i16, i16* %src16 |
| br label %while.cond |
| |
| while.cond: ; preds = %if.end, %entry |
| %dp.0 = phi i8* [ %0, %entry ], [ %dp.1, %if.end ] |
| %1 = load volatile i1, i1* %kOne, align 4 |
| br i1 %1, label %if.else, label %if.then |
| |
| if.then: ; preds = %while.cond |
| store i8 9, i8* %dp.0, align 1 |
| br label %if.end |
| |
| if.else: ; preds = %while.cond |
| call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dp.0, i8* %src, i64 2, i32 1, i1 false) |
| %dp.new = getelementptr inbounds i8, i8* %dp.0, i64 1 |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| %dp.1 = phi i8* [ %dp.0, %if.then ], [ %dp.new, %if.else ] |
| ; CHECK: %2 = load i8, i8* %0 |
| %2 = load i8, i8* %0, align 1 |
| ; CHECK-NEXT: call void @check(i8 %2) |
| call void @check(i8 %2) |
| br label %while.cond |
| } |
