Add operator[] to simd::Vector. Change implementation of movemaskInverse.

include/simd/functions.hpp

@@ -191,9 +191,13 @@ template <typename T>
 inline T movemaskInverse(int a);
 
 template <>
-inline float_4 movemaskInverse<float_4>(int a) {
-	return float_4(a & (1 << 0), a & (1 << 1), a & (1 << 2), a & (1 << 3)) != float_4::zero();
+inline float_4 movemaskInverse<float_4>(int x) {
+	__m128i msk8421 = _mm_set_epi32(8, 4, 2, 1);
+	__m128i x_bc = _mm_set1_epi32(x);
+	__m128i t = _mm_and_si128(x_bc, msk8421);
+	return float_4(_mm_castsi128_ps(_mm_cmpeq_epi32(x_bc, t)));
 }
 
+
 } // namespace simd
 } // namespace rack

include/simd/vector.hpp

@@ -85,6 +85,9 @@ struct Vector<float, 4> {
 		_mm_storeu_ps(x, v);
 	}
 
+	float &operator[](int i) {return s[i];}
+	const float &operator[](int i) const {return s[i];}
+
 	// Conversions
 	Vector(Vector<int32_t, 4> a);
 	// Casts
@@ -126,6 +129,8 @@ struct Vector<int32_t, 4> {
 		// Use _mm_storeu_si128() because GCC doesn't support _mm_storeu_si32()
 		_mm_storeu_si128((__m128i*) x, v);
 	}
+	int32_t &operator[](int i) {return s[i];}
+	const int32_t &operator[](int i) const {return s[i];}
 	Vector(Vector<float, 4> a);
 	static Vector cast(Vector<float, 4> a);
 };