builtins: Avoid ICE with __builtin_clear_padding on POINTERS_EXTEND_UNSIGNED targets...

The function that calls targetm.emit_call_builtin___clear_cache
asserts that each of the begin and end operands has either ptr_mode or
Pmode.
On most targets that is the same mode, but e.g. on aarch64 -mabi=ilp32
or a few others it is different.  When a target has a clear cache
non-library handler, it will use create_address_operand which will do the
conversion to the right mode automatically, but when emitting a library
call, we just say the operands are ptr_mode even when they can be Pmode
too; in that case we need to convert explicitly.

2020-12-07  Jakub Jelinek  <jakub@redhat.com>

	PR target/98147
	* builtins.c (default_emit_call_builtin___clear_cache): Call
	convert_memory_address to ptr_mode on both begin and end.

	* gcc.dg/pr98147.c: New test.

diff --git a/gcc/builtins.c b/gcc/builtins.c
index bd12659712f72b5606bc2ade5e3be1bff14ebe9c..faa5030853bc146e1ad88c39e74e46fe2ba84c8b 100644 (file)
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -7790,8 +7790,8 @@ default_emit_call_builtin___clear_cache (rtx begin, rtx end)
 
   emit_library_call (callee,
                     LCT_NORMAL, VOIDmode,
-                    begin, ptr_mode,
-                    end, ptr_mode);
+                    convert_memory_address (ptr_mode, begin), ptr_mode,
+                    convert_memory_address (ptr_mode, end), ptr_mode);
 }
 
 /* Emit a call to __builtin___clear_cache, unless the target specifies

diff --git a/gcc/testsuite/gcc.dg/pr98147.c b/gcc/testsuite/gcc.dg/pr98147.c
new file mode 100644 (file)
index 0000000..3edc798
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr98147.c
@@ -0,0 +1,10 @@
+/* PR target/98147 */
+
+char buffer[32] = "foo bar";
+
+int
+main ()
+{
+  __builtin___clear_cache (buffer, buffer + 32);
+  return 0;
+}