c3-lang/libffi

diff --git a/src/x86/ffi64.c b/src/x86/ffi64.c
index bd917f0..bd241ef 100644
--- a/src/x86/ffi64.c
+++ b/src/x86/ffi64.c
@@ -168,7 +168,7 @@ classify_argument (ffi_type *type, enum x86_64_reg_class classes[],
     case FFI_TYPE_SINT64:
     case FFI_TYPE_POINTER:
       {
-	int size = byte_offset + type->size;
+	size_t size = byte_offset + type->size;
 
 	if (size <= 4)
 	  {
@@ -210,7 +210,7 @@ classify_argument (ffi_type *type, enum x86_64_reg_class classes[],
     case FFI_TYPE_STRUCT:
       {
 	const int UNITS_PER_WORD = 8;
-	int words = (type->size + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
+	int words = ((int)type->size + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
 	ffi_type **ptr;
 	int i;
 	enum x86_64_reg_class subclasses[MAX_CLASSES];
@@ -242,7 +242,7 @@ classify_argument (ffi_type *type, enum x86_64_reg_class classes[],
 	      return 0;
 	    for (i = 0; i < num; i++)
 	      {
-		int pos = byte_offset / 8;
+		size_t pos = byte_offset / 8;
 		classes[i + pos] =
 		  merge_classes (subclasses[i], classes[i + pos]);
 	      }
@@ -411,7 +411,7 @@ ffi_prep_cif_machdep (ffi_cif *cif)
   if (ssecount)
     flags |= 1 << 11;
   cif->flags = flags;
-  cif->bytes = ALIGN (bytes, 8);
+  cif->bytes = (unsigned)ALIGN (bytes, 8);
 
   return FFI_OK;
 }