for sse4a functions compare only the lower quadword

the upper quadword is undefined

Author: folkertdev

crates/core_arch/src/x86/sse4a.rs

@@ -160,15 +160,23 @@ mod tests {
         let y = _mm_setr_epi64x(v, 0);
         let e = _mm_setr_epi64x(0b0110_i64, 0);
         let r = _mm_extract_si64(x, y);
-        assert_eq_m128i(r, e);
+
+        // The upper quadword of the destination register is undefined.
+        let r = _mm_cvtsi128_si64(r);
+        let e = _mm_cvtsi128_si64(e);
+        assert_eq!(r, e);
     }
 
     #[simd_test(enable = "sse4a")]
     fn test_mm_extracti_si64() {
         let a = _mm_setr_epi64x(0x0123456789abcdef, 0);
         let r = _mm_extracti_si64::<8, 8>(a);
         let e = _mm_setr_epi64x(0xcd, 0);
-        assert_eq_m128i(r, e);
+
+        // The upper quadword of the destination register is undefined.
+        let r = _mm_cvtsi128_si64(r);
+        let e = _mm_cvtsi128_si64(e);
+        assert_eq!(r, e);
     }
 
     #[simd_test(enable = "sse4a")]
@@ -185,7 +193,11 @@ mod tests {
         //        ^idx: 2^3 = 8 ^length = 2^2 = 4
         let y = _mm_setr_epi64x(i, v);
         let r = _mm_insert_si64(x, y);
-        assert_eq_m128i(r, expected);
+
+        // The upper quadword of the destination register is undefined.
+        let r = _mm_cvtsi128_si64(r);
+        let expected = _mm_cvtsi128_si64(expected);
+        assert_eq!(r, expected);
     }
 
     #[simd_test(enable = "sse4a")]
@@ -194,7 +206,11 @@ mod tests {
         let b = _mm_setr_epi64x(0x0011223344556677, 0);
         let r = _mm_inserti_si64::<8, 8>(a, b);
         let e = _mm_setr_epi64x(0x0123456789ab77ef, 0);
-        assert_eq_m128i(r, e);
+
+        // The upper quadword of the destination register is undefined.
+        let r = _mm_cvtsi128_si64(r);
+        let e = _mm_cvtsi128_si64(e);
+        assert_eq!(r, e);
     }
 
     #[repr(align(16))]