[llvm-bugs] [Bug 47126] New: Wrong IR emitted for "target enter data" with dependences

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47126

            Bug ID: 47126
           Summary: Wrong IR emitted for "target enter data" with
                    dependences
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Clang Compiler Support
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rofirrim at gmail.com
                CC: llvm-bugs at lists.llvm.org

Hi all,

the following test is failing in x86-64

  libomptarget :: offloading/target_depend_nowait.cpp

The following small reproducer seems to show the issue

// -- t.cpp
#include <omp.h>
#include <stdio.h>

#define N 1024

int A[N];
int main() {
#pragma omp target enter data map(to:A) depend(out:A[0])
}
// -- end of t.cpp

For reference this is the compilation line

clang++ \
   -fopenmp \
   -pthread \
   -fno-experimental-isel \
   -I /work/llvm-src/openmp/libomptarget/test \
   -I
/work/llvm-build-debug/runtimes/runtimes-bins/openmp/libomptarget/../runtime/src
\
   -fopenmp-targets=x86_64-pc-linux-gnu \
   t.cpp \
   -S -emit-llvm \
   -o t.ll

The generated IR contains a memcpy with a source from null pointer.

%20 = getelementptr inbounds %struct..kmp_privates.t, %struct..kmp_privates.t*
%11, i32 0, i32 3
%21 = bitcast [1 x i8*]* %20 to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %21, i8* align 8 null, i64 8,
i1 false) ; <-- bug?

Kind regards,

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