wasm support

include/xsimd/arch/xsimd_wasm.hpp

@@ -1576,6 +1576,26 @@ namespace xsimd
             return bitwise_cast<int8_t>(swizzle(bitwise_cast<uint8_t>(self), mask, wasm {}));
         }
 
+        // transpose
+        template <class A>
+        XSIMD_INLINE void transpose(batch<float, A>* matrix_begin, batch<float, A>* matrix_end, requires_arch<wasm>) noexcept
+        {
+            assert((matrix_end - matrix_begin == batch<float, A>::size) && "correctly sized matrix");
+            (void)matrix_end;
+            auto r0 = matrix_begin[0], r1 = matrix_begin[1], r2 = matrix_begin[2], r3 = matrix_begin[3];
+
+            auto t0 = wasm_i32x4_shuffle(r0, r1, 0, 4, 1, 5); // r0[0] r1[0] r0[1] r1[1]
+            auto t1 = wasm_i32x4_shuffle(r0, r1, 2, 6, 3, 7); // r0[2] r1[2] r0[3] r1[3]
+
+            auto t2 = wasm_i32x4_shuffle(r2, r3, 0, 4, 1, 5); // r2[0] r3[0] r2[1] r3[1]
+            auto t3 = wasm_i32x4_shuffle(r2, r3, 2, 6, 3, 7); // r2[2] r3[2] r2[3] r3[3]
+
+            matrix_begin[0] = wasm_i32x4_shuffle(t0, t2, 0, 1, 4, 5); // r0[0] r1[0] r2[0] r3[0]
+            matrix_begin[1] = wasm_i32x4_shuffle(t0, t2, 2, 3, 6, 7); // r0[1] r1[1] r2[1] r3[1]
+            matrix_begin[2] = wasm_i32x4_shuffle(t1, t3, 0, 1, 4, 5); // r0[2] r1[2] r2[2] r3[2]
+            matrix_begin[3] = wasm_i32x4_shuffle(t1, t3, 2, 3, 6, 7); // r0[3] r1[3] r2[3] r3[3]
+        }
+
         // trunc
         template <class A>
         XSIMD_INLINE batch<float, A> trunc(batch<float, A> const& self, requires_arch<wasm>) noexcept