Add Altivec vec_floor

Author: lu-zero

crates/core_arch/src/powerpc/altivec.rs

@@ -239,6 +239,9 @@ extern "C" {
 
     #[link_name = "llvm.ppc.altivec.vexptefp"]
     fn vexptefp(a: vector_float) -> vector_float;
+
+    #[link_name = "llvm.floor.v4f32"]
+    fn vfloor(a: vector_float) -> vector_float;
 }
 
 macro_rules! s_t_l {
@@ -409,6 +412,8 @@ mod sealed {
         }
     }
 
+    test_impl! { vec_floor(a: vector_float) -> vector_float [ vfloor, vrfim / xvrspim ] }
+
     test_impl! { vec_vexptefp(a: vector_float) -> vector_float [ vexptefp, vexptefp ] }
 
     test_impl! { vec_vcmpgtub(a: vector_unsigned_char, b: vector_unsigned_char) -> vector_bool_char [ vcmpgtub, vcmpgtub ] }
@@ -1371,6 +1376,13 @@ mod sealed {
     vector_mladd! { vector_signed_short, vector_signed_short, vector_signed_short }
 }
 
+/// Vector floor.
+#[inline]
+#[target_feature(enable = "altivec")]
+pub unsafe fn vec_floor(a: vector_float) -> vector_float {
+    sealed::vec_floor(a)
+}
+
 /// Vector expte.
 #[inline]
 #[target_feature(enable = "altivec")]
@@ -1800,6 +1812,11 @@ mod tests {
         }
     }
 
+    test_vec_1! { test_vec_floor, vec_floor, f32x4,
+        [1.1, 1.9, -0.5, -0.9],
+        [1.0, 1.0, -1.0, -1.0]
+    }
+
     test_vec_1! { test_vec_expte, vec_expte, f32x4,
         [0.0, 2.0, 2.0, -1.0],
         ~[1.0, 4.0, 4.0, 0.5]