use simd_ctlz instead of an extern

Author: folkertdev

crates/core_arch/src/powerpc/altivec.rs

@@ -368,13 +368,6 @@ unsafe extern "C" {
     #[link_name = "llvm.ppc.altivec.srv"]
     fn vsrv(a: vector_unsigned_char, b: vector_unsigned_char) -> vector_unsigned_char;
 
-    #[link_name = "llvm.ctlz.v16i8"]
-    fn vclzb(a: vector_signed_char) -> vector_signed_char;
-    #[link_name = "llvm.ctlz.v8i16"]
-    fn vclzh(a: vector_signed_short) -> vector_signed_short;
-    #[link_name = "llvm.ctlz.v4i32"]
-    fn vclzw(a: vector_signed_int) -> vector_signed_int;
-
     #[link_name = "llvm.ppc.altivec.vrlb"]
     fn vrlb(a: vector_signed_char, b: vector_unsigned_char) -> vector_signed_char;
     #[link_name = "llvm.ppc.altivec.vrlh"]
@@ -3191,9 +3184,9 @@ mod sealed {
 
     impl_vec_shift_octect! { [VectorSro vec_sro] (vsro) }
 
-    test_impl! { vec_vcntlzb(a: vector_signed_char) -> vector_signed_char [vclzb, vclzb] }
-    test_impl! { vec_vcntlzh(a: vector_signed_short) -> vector_signed_short [vclzh, vclzh] }
-    test_impl! { vec_vcntlzw(a: vector_signed_int) -> vector_signed_int [vclzw, vclzw] }
+    test_impl! { vec_vcntlzb(a: vector_signed_char) -> vector_signed_char [simd_ctlz, vclzb] }
+    test_impl! { vec_vcntlzh(a: vector_signed_short) -> vector_signed_short [simd_ctlz, vclzh] }
+    test_impl! { vec_vcntlzw(a: vector_signed_int) -> vector_signed_int [simd_ctlz, vclzw] }
 
     #[unstable(feature = "stdarch_powerpc", issue = "111145")]
     pub trait VectorCntlz {