c/89270 - honor registered_builtin_types in type_for_size

The following fixes the intermediate conversions inserted by
convert_to_integer when facing address-spaces and converts
to their effective [u]intptr_t when they are registered_builtin_types
by considering those also from c_common_type_for_size and not
only from c_common_type_for_mode.

	PR c/89270
gcc/c-family/
	* c-common.cc (c_common_type_for_size): Consider
	registered_builtin_types.

gcc/testsuite/
	* gcc.target/avr/pr89270.c: New testcase.

2 files changed, 16 insertions, 0 deletions

diff --git a/gcc/c-family/c-common.cc b/gcc/c-family/c-common.cc
index b2b70c9..d175054d 100644
--- a/gcc/c-family/c-common.cc
+++ b/gcc/c-family/c-common.cc
@@ -2362,6 +2362,15 @@ c_common_type_for_size (unsigned int bits, int unsignedp)
     return (unsignedp ? widest_unsigned_literal_type_node
 	    : widest_integer_literal_type_node);
 
+  for (tree t = registered_builtin_types; t; t = TREE_CHAIN (t))
+    {
+      tree type = TREE_VALUE (t);
+      if (TREE_CODE (type) == INTEGER_TYPE
+	  && bits == TYPE_PRECISION (type)
+	  && !!unsignedp == !!TYPE_UNSIGNED (type))
+	return type;
+    }
+
   if (bits <= TYPE_PRECISION (intQI_type_node))
     return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
 
diff --git a/gcc/testsuite/gcc.target/avr/pr89270.c b/gcc/testsuite/gcc.target/avr/pr89270.c
new file mode 100644
index 0000000..2b6e4a8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/avr/pr89270.c
@@ -0,0 +1,7 @@
+/* { dg-do compile } */
+
+void test()
+{
+  extern const unsigned char __memx __data_load_end;
+  __uint24 top=(__uint24)&__data_load_end;
+}