Add 32bit variant for clz, ctz, ffs, parity and popcount

Author: claziss

gcc/config/arc64/arc64.c

@@ -1114,13 +1114,26 @@ arc64_initialize_trampoline (rtx tramp, tree fndecl, rtx cxt)
 
 
 /* Implement FUNCTION_OK_FOR_SIBCALL hook.  */
+
 static bool
 arc64_function_ok_for_sibcall (tree decl ATTRIBUTE_UNUSED,
 			     tree exp ATTRIBUTE_UNUSED)
 {
   return true;
 }
 
+/* Implement INIT_LIBFUNCS hook.  */
+
+static void
+arc64_init_libfuncs (void)
+{
+  set_optab_libfunc (ffs_optab, SImode, "__ffssi2");
+  set_optab_libfunc (clz_optab, SImode, "__clzsi2");
+  set_optab_libfunc (ctz_optab, SImode, "__ctzsi2");
+  set_optab_libfunc (popcount_optab, SImode, "__popcountsi2");
+  set_optab_libfunc (parity_optab, SImode, "__paritysi2");
+}
+
 /*
   Global functions.
 */
@@ -1598,6 +1611,9 @@ arc64_limm_addr_p (rtx op)
 #undef  TARGET_FUNCTION_OK_FOR_SIBCALL
 #define TARGET_FUNCTION_OK_FOR_SIBCALL arc64_function_ok_for_sibcall
 
+#undef TARGET_INIT_LIBFUNCS
+#define TARGET_INIT_LIBFUNCS arc64_init_libfuncs
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 
 #include "gt-arc64.h"

libgcc/config/arc64/lib2funcs.c

@@ -137,3 +137,15 @@ __umoddi3 (uint64_t a, uint64_t b)
 {
   return udivmoddi4 (a, b, 1);
 }
+
+/* We need 32bit version for some of the functions defined in
+   libgcc2.c.  */
+#define LIBGCC2_UNITS_PER_WORD 4
+
+#define L_clzsi2
+#define L_ctzsi2
+#define L_ffssi2
+#define L_paritysi2
+#define L_popcountsi2
+
+#include "libgcc2.c"