change the logic of the fft_float allocate

Author: A-006

source/module_base/module_fft/fft_temp.cpp

@@ -64,6 +64,9 @@ void FFT_TEMP::initfft(int nx_in, int ny_in, int nz_in, int lixy_in, int rixy_in
     {
         fft_float = new FFT_CPU<float>();
         fft_double = new FFT_CPU<double>();
+        #ifndef __ENABLE_FLOAT_FFTW
+            float_define = false;
+        #endif
     }
     if (device=="gpu")
     {
@@ -77,12 +80,7 @@ void FFT_TEMP::initfft(int nx_in, int ny_in, int nz_in, int lixy_in, int rixy_in
     }
     if (this->precision=="single")
     {
-        float_flag = true;
-        #if defined (__ENABLE_FLOAT_FFTW) || defined(__CUDA) || defined(__ROCM)
-        float_define = true;
-        #endif
-
-        float_flag = float_define & float_flag;
+        float_flag = float_define;
         double_flag = true;
     }
     else if (this->precision=="double")

source/module_base/module_fft/fft_temp.h

@@ -55,7 +55,7 @@ class FFT_TEMP
     private:
         int fft_mode = 0; ///< fftw mode 0: estimate, 1: measure, 2: patient, 3: exhaustive
         bool float_flag=false;
-        bool float_define=false;
+        bool float_define=true;
         bool double_flag=false;
         FFT_BASE<float>* fft_float=nullptr;
         FFT_BASE<double>* fft_double=nullptr;