| ; RUN: opt -S -passes=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.p0.p0.i64(ptr, ptr, i64, i32, i1) |
| |
| ; CHECK-LABEL: define void @buggy |
| define void @buggy(ptr %src, ptr %kOne) { |
| entry: |
| %dst = alloca [1 x i8], align 1 |
| store i8 42, ptr %dst, align 1 |
| %srcval = load i16, ptr %src |
| br label %while.cond |
| |
| while.cond: ; preds = %if.end, %entry |
| %dp.0 = phi ptr [ %dst, %entry ], [ %dp.1, %if.end ] |
| %0 = load volatile i1, ptr %kOne, align 4 |
| br i1 %0, label %if.else, label %if.then |
| |
| if.then: ; preds = %while.cond |
| store i8 9, ptr %dp.0, align 1 |
| br label %if.end |
| |
| if.else: ; preds = %while.cond |
| call void @llvm.memcpy.p0.p0.i64(ptr %dp.0, ptr %src, i64 2, i32 1, i1 false) |
| %dp.new = getelementptr inbounds i8, ptr %dp.0, i64 1 |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| %dp.1 = phi ptr [ %dp.0, %if.then ], [ %dp.new, %if.else ] |
| ; CHECK: %1 = load i8, ptr %dst |
| %1 = load i8, ptr %dst, align 1 |
| ; CHECK-NEXT: call void @check(i8 %1) |
| call void @check(i8 %1) |
| br label %while.cond |
| } |
