Double-precision floating-point vectors

Overview

The simd library provides many functions in this group, in three variants:

• The default variant—for example, simd_rsqrt(_:)

• The precise variant—for example, simd_precise_rsqrt(_:)

• The fast variant—for example, simd_fast_rsqrt(_:)

The precise variants are accurate to a few units in the last place (ULPs). The fast variants provide greater speed but may have as little as 22 bits of accuracy for double-precision functions.

The compiler flag defines the behavior of the default variant. Ordinarily, the compiler resolves the default variants to their precise counterparts. Set the -ffast-math compiler flag to specify that the default variants of the functions resolve to the fast variants.

Topics

Vector data types

• simd_double1
• simd_double2
• simd_double3
• simd_double4
• simd_double8

Packed vector data types

• simd_packed_double2
• simd_packed_double4
• simd_packed_double8

See Also

Floating-Point Vectors

• Working with Vectors
• Half-precision floating-point vectors
• Single-precision floating-point vectors