Add support for printing functions selected in gf_init

There is currently no way to figure out which functions were selected
during gf_init and as a result of SIMD options. This is not even possible
in gdb since most functions are static.

This commit adds a new macro SET_FUNCTION that records the name of the
function selected during init inside the gf_internal structure. This macro
only works when DEBUG_FUNCTIONS is defined during compile. Otherwise the
code works exactly as it did before this change.

The names of selected functions will be used during testing of SIMD
runtime detection.

All calls such as:

gf->multiply.w32 = gf_w16_shift_multiply;

need to be replaced with the following:

SET_FUNCTION(gf,multiply,w32,gf_w16_shift_multiply)

Also added a new flag to tools/gf_methods that will print the names of
functions selected during gf_init.

1 files changed, 16 insertions, 0 deletions

diff --git a/include/gf_int.h b/include/gf_int.h
index 32866f4..0356920 100644
--- a/include/gf_int.h
+++ b/include/gf_int.h
@@ -30,8 +30,24 @@ typedef struct {
   int arg2;
   gf_t *base_gf;
   void *private;
+#ifdef DEBUG_FUNCTIONS
+  const char *multiply;
+  const char *divide;
+  const char *inverse;
+  const char *multiply_region;
+  const char *extract_word;
+#endif
 } gf_internal_t;
 
+#ifdef DEBUG_FUNCTIONS
+#define SET_FUNCTION(gf,method,size,func) \
+  { (gf)->method.size = (func); \
+  ((gf_internal_t*)(gf)->scratch)->method = #func; }
+#else
+#define SET_FUNCTION(gf,method,size,func) \
+  (gf)->method.size = (func);
+#endif
+
 extern int gf_w4_init (gf_t *gf);
 extern int gf_w4_scratch_size(int mult_type, int region_type, int divide_type, int arg1, int arg2);