test/Integration/OpenMP/atomic-read-complex.f90

!===----------------------------------------------------------------------===!
! This directory can be used to add Integration tests involving multiple
! stages of the compiler (for eg. from Fortran to LLVM IR). It should not
! contain executable tests. We should only add tests here sparingly and only
! if there is no other way to test. Repeat this message in each test that is
! added to this directory and sub-directories.
!===----------------------------------------------------------------------===!

! Test lowering of atomic read to LLVM IR for complex types.
! This is a regression test for issue #165184.

! RUN: %flang_fc1 -emit-llvm -fopenmp -o - %s | FileCheck %s

! Test that atomic read operations with complex types emit the correct
! size parameter to __atomic_load:
! - complex(4) (8 bytes total): should call __atomic_load(i64 8, ...)
! - complex(8) (16 bytes total): should call __atomic_load(i64 16, ...)

program atomic_read_complex
  implicit none

  ! Test complex(4) - single precision (8 bytes)
  complex(4) :: c41, c42
  ! Test complex(8) - double precision (16 bytes)
  complex(8) :: c81, c82

  c42 = (1.0_4, 1.0_4)
  c82 = (1.0_8, 1.0_8)

  ! CHECK-LABEL: define {{.*}} @_QQmain

  ! Single precision complex: 8 bytes
  ! CHECK: call void @__atomic_load(i64 8, ptr {{.*}}, ptr {{.*}}, i32 {{.*}})
!$omp atomic read
  c41 = c42

  ! Double precision complex: 16 bytes (this was broken before the fix)
  ! CHECK: call void @__atomic_load(i64 16, ptr {{.*}}, ptr {{.*}}, i32 {{.*}})
!$omp atomic read
  c81 = c82

end program atomic_read_complex