Remove flag __FFTW3_UNALIGNED

docs/technologies/libraries.md

@@ -60,10 +60,7 @@ FFTW is also provided by MKL. Pass `-DCP2K_USE_FFTW3_WITH_MKL=ON` to CMake.
 :warning: Note that FFTW must know the Fortran compiler you will use in order to install properly
 (e.g., `export F77=gfortran` before configure if you intend to use gfortran).
 
-:warning: Note that FFTW configured for SIMD vectorization, requires buffers aligned to SIMD width.
-If this cannot be ensured for the compiler used (e.g., NAG f95, Intel IA32/gfortran), one should
-either configure FFTW without SIMD support or otherwise set the define `-D__FFTW3_UNALIGNED`. Since
-CP2K is OpenMP parallelized, the FFTW3 threading library libfftw3_threads (or libfftw3_omp) is
+Since CP2K is OpenMP parallelized, the FFTW3 threading library libfftw3_threads (or libfftw3_omp) is
 required. Pass `-DCP2K_ENABLE_FFTW3_THREADS_SUPPORT=ON` or `-DCP2K_ENABLE_FFTW3_OPENMP_SUPPORT=ON`
 respectivly to CMake.
 

src/pw/fft/fftw3_lib.F

@@ -686,10 +686,6 @@ CONTAINS
          CPABORT("fftw3_create_plan_3d")
       END SELECT
 
-#if defined(__FFTW3_UNALIGNED)
-      fftw_plan_type = fftw_plan_type + FFTW_UNALIGNED
-#endif
-
       IF (plan%fsign == +1) THEN
          fft_direction = FFTW_FORWARD
       ELSE
@@ -1020,9 +1016,6 @@ CONTAINS
          CPABORT("fftw3_create_plan_1dm")
       END SELECT
 
-#if defined(__FFTW3_UNALIGNED)
-      fftw_plan_type = fftw_plan_type + FFTW_UNALIGNED
-#endif
       num_threads = 1
       plan%separated_plans = .FALSE.
 !$OMP PARALLEL DEFAULT(NONE), &

tools/precommit/check_file_properties.py

@@ -91,7 +91,6 @@ FLAG_EXCEPTIONS = (
     r"__CRAY_PM_ENERGY",
     r"__STATM_RESIDENT",
     r"__STATM_TOTAL",
-    r"__FFTW3_UNALIGNED",
 )
 
 FLAG_EXCEPTIONS_RE = re.compile(r"|".join(FLAG_EXCEPTIONS))