add pffft

pffft/pf_conv.h

@@ -0,0 +1,109 @@
+#pragma once
+
+/* pf_conv.h/.cpp implements linear "slow" convolution.
+ * this code is primarily for test/demonstration of runtime dispatching.
+ * each "kernel" is compiled with different compiler/architecture options,
+ * that activates different implementations in the MIPP headers.
+ *
+ * the dispatcher library 'pf_conv_dispatcher' collects (links agains)
+ * all the pf_conv_arch_<opt> libraries ..
+ * and provides the  get_all_conv_arch_ptrs() function,
+ * which delivers an array of pointers to the struct (conv_f_ptrs)
+ * containing the function pointers for the different implementations.
+ *
+ * requirement(s):
+ * - installed MIPP headers
+ * - compiler definitions for the different architecture types:
+ *   see CMakeLists.txt CONV_ARCH_MSVC_AMD64, CONV_ARCH_GCC_ARM32NEON, ..
+ * - one cmake library target pf_conv_arch_<opt> for each architecture option.
+ *   each one gets it's specific  architecture/compiler  options
+ *    utilizing the target_set_cxx_arch_option() macro in the CMakeLists.txt
+ */
+
+#include "pf_cplx.h"
+
+#if defined(_MSC_VER)
+#  define RESTRICT __restrict
+#elif defined(__GNUC__)
+#  define RESTRICT __restrict
+#else
+#  define RESTRICT
+#endif
+
+
+struct conv_buffer_state
+{
+    int offset; // sample index where data (to process) starts
+    int size;   // actual - or previous - size in amount of samples from buffer start (NOT offset)
+};
+
+// declare provided function pointer types
+
+typedef const char * (*f_conv_id)();
+
+typedef int  (*f_conv_float_simd_size)();
+
+typedef void (*f_conv_float_move_rest)(float * RESTRICT s, conv_buffer_state * RESTRICT state);
+typedef void (*f_conv_cplx_move_rest)(complexf * RESTRICT s, conv_buffer_state * RESTRICT state);
+
+typedef int  (*f_conv_float_inplace)(
+        float * RESTRICT s, conv_buffer_state * RESTRICT state,
+        const float * RESTRICT filter, const int sz_filter
+        );
+
+typedef int  (*f_conv_float_oop)(
+        const float * RESTRICT s, conv_buffer_state * RESTRICT state,
+        const float * RESTRICT filter, const int sz_filter,
+        float * RESTRICT y
+        );
+
+typedef int  (*f_conv_cplx_float_oop)(
+        const complexf * RESTRICT s, conv_buffer_state * RESTRICT state,
+        const float * RESTRICT filter, const int sz_filter,
+        complexf * RESTRICT y
+        );
+
+
+// struct with the provided function pointers
+struct conv_f_ptrs
+{
+    const char * id;
+    const int using_mipp;
+    f_conv_id               fp_id;
+    f_conv_float_simd_size  fp_conv_float_simd_size;
+
+    f_conv_float_move_rest  fp_conv_float_move_rest;
+    f_conv_float_inplace    fp_conv_float_inplace;
+    f_conv_float_oop        fp_conv_float_oop;
+
+    f_conv_cplx_move_rest   fp_conv_cplx_move_rest;
+    f_conv_cplx_float_oop   fp_conv_cplx_float_oop;
+};
+
+typedef const conv_f_ptrs * ptr_to_conv_f_ptrs;
+
+// function pointer type, delivering the struct with the function pointers
+typedef const conv_f_ptrs* (*f_conv_ptrs)();
+
+
+// helper for systematic function names
+#define CONV_FN_ARCH(FN, ARCH) FN##_##ARCH
+
+// declare all functions - returning the structs with the function pointers
+extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, none)();  // = conv_ptrs_none()
+extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, dflt)();  // simd / mipp is activated
+
+extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, sse3)();  // = conv_ptrs_sse3()
+extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, sse4)();
+extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, avx)();
+extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, avx2)();
+
+extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, sse2)();
+//extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, avx)();  // already declared
+//extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, avx2)(); // already declared
+
+extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, neon_vfpv4)();    // for armv7l / 32-bit ARM
+extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, neon_rpi3_a53)();
+extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, neon_rpi4_a72)();
+
+extern const conv_f_ptrs* CONV_FN_ARCH(conv_ptrs, armv8a)();  // for aarch64