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-rw-r--r--src/lisp.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/lisp.h b/src/lisp.h
index 1fc6130be0b..4042f4decb1 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -341,7 +341,9 @@ error !;
(struct Lisp_Symbol *) ((intptr_t) XLI (a) - Lisp_Symbol \
+ (char *) lispsym))
# define lisp_h_XTYPE(a) ((enum Lisp_Type) (XLI (a) & ~VALMASK))
-# define lisp_h_XUNTAG(a, type) ((void *) (intptr_t) (XLI (a) - (type)))
+# define lisp_h_XUNTAG(a, type) \
+ __builtin_assume_aligned ((void *) (intptr_t) (XLI (a) - (type)), \
+ GCALIGNMENT)
#endif
/* When compiling via gcc -O0, define the key operations as macros, as