================
@@ -32,12 +32,13 @@ typedef unsigned int __v4su 
__attribute__((__vector_size__(16)));
 #endif
 
 /* Define the default attributes for the functions in this file. */
-#define __DEFAULT_FN_ATTRS                                                     
\
-  __attribute__((__always_inline__, __nodebug__, __target__("sse,no-evex512"), 
\
-                 __min_vector_width__(128)))
-#define __DEFAULT_FN_ATTRS_MMX                                                 
\
-  __attribute__((__always_inline__, __nodebug__,                               
\
-                 __target__("mmx,sse,no-evex512"), __min_vector_width__(64)))
+#define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, 
__target__("sse,no-evex512"), __min_vector_width__(128)))
+#define __DEFAULT_FN_ATTRS_SSE2 __attribute__((__always_inline__, __nodebug__, 
__target__("sse2,no-evex512"), __min_vector_width__(64)))
+
+#define __trunc64(x) (__m64)__builtin_shufflevector((__v2di)(x), __extension__ 
(__v2di){}, 0)
+#define __zext128(x) (__m128i)__builtin_shufflevector((__v2si)(x), 
__extension__ (__v2si){}, 0, 1, 2, 3)
----------------
jyknight wrote:

Vectors follow the same init-list rules as array/aggregate, where unmentioned 
elements are zeroed.

https://github.com/llvm/llvm-project/pull/96540
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