add vqsubq_u8

Author: Licenser

crates/core_arch/src/arm/neon.rs

@@ -106,11 +106,11 @@ extern "C" {
     #[cfg_attr(target_arch = "aarch64", link_name = "llvm.aarch64.neon.uqxtn.v2i32")]
     fn vqmovn_u64_(a: uint64x2_t) -> uint32x2_t;
 
-/*
-        #[cfg_attr(target_arch = "aarch64", link_name = "llvm.aarch64.neon.vget_lane.v8u8")]
-    #[cfg_attr(target_arch = "arm", link_name = "llvm.arm.neon.vget_lane.v8u8")]
-    fn vget_lane_u8_(v: uint8x8_t, lane: i32) -> u8;
-*/
+    #[cfg_attr(target_arch = "aarch64", link_name = "llvm.aarch64.neon.uqsub.v16i8")]
+    #[cfg_attr(target_arch = "arm", link_name = "llvm.arm.neon.vqsubu.v16i8")]
+    fn vqsubq_u8_(a: uint8x16_t, a: uint8x16_t) -> uint8x16_t;
+
+
     #[cfg_attr(target_arch = "arm", link_name = "llvm.arm.neon.vpmins.v8i8")]
     #[cfg_attr(target_arch = "aarch64", link_name = "llvm.aarch64.neon.sminp.v8i8")]
     fn vpmins_v8i8(a: int8x8_t, b: int8x8_t) -> int8x8_t;
@@ -195,7 +195,17 @@ extern "C" {
 pub unsafe fn vqmovn_u64(a: uint64x2_t) -> uint32x2_t {
     vqmovn_u64_(a)
 }
-    
+
+//uint8x16_t vqsubq_u8 (uint8x16_t a, uint8x16_t b)
+///Unsigned saturating subtract
+#[inline]
+#[target_feature(enable = "neon")]
+#[cfg_attr(target_arch = "arm", target_feature(enable = "v7"))]
+#[cfg_attr(test, assert_instr(uqsub))]
+pub unsafe fn vqsubq_u8(a: uint8x16_t, b: uint8x16_t) -> uint8x16_t {
+    vqsubq_u8_(a, b)
+}
+
 /// Vector add.
 #[inline]
 #[target_feature(enable = "neon")]
@@ -1621,6 +1631,32 @@ mod tests {
     use std::{i16, i32, i8, mem::transmute, u16, u32, u8};
     use stdarch_test::simd_test;
 
+
+//uint8x16_t vqsubq_u8 (uint8x16_t a, uint8x16_t b)
+
+    #[simd_test(enable = "neon")]
+    unsafe fn test_vqsubq_u8() {
+        let a = u8x16::new(
+            42, 42, 42, 42,
+            42, 42, 42, 42,
+            42, 42, 42, 42,
+            42, 42, 42, 42
+            );
+        let b = u8x16::new(
+            1, 2, 3, 4,
+            5, 6, 7, 8,
+            9, 10, 11, 12,
+            13, 14, 15, 16
+            );
+        let e = u8x16::new(
+            41, 40, 39, 38,
+            37, 36, 35, 34,
+            33, 32, 31, 30,
+            29, 28, 27, 26
+            );
+        let r: u8x16 = transmute(vqsubq_u8(transmute(a), transmute(b)));
+        assert_eq!(r, e);
+    }
     #[simd_test(enable = "neon")]
     unsafe fn test_vqmovn_u64() {
         let a = u64x2::new(1, 2);