 { $code
     "char-16"
     "uchar-16"
-    "char-32"
-    "uchar-32"
     "short-8"
     "ushort-8"
-    "short-16"
-    "ushort-16"
     "int-4"
     "uint-4"
-    "int-8"
-    "uint-8"
     "longlong-2"
     "ulonglong-2"
-    "longlong-4"
-    "ulonglong-4"
     "float-4"
-    "float-8"
     "double-2"
-    "double-4"
 } ;
 
 ARTICLE: "math.vectors.simd.words" "SIMD vector words"

ARTICLE: "math.vectors.simd.accuracy" "Numerical accuracy of SIMD primitives"
"No guarantees are made that " { $vocab-link "math.vectors.simd" } " words will give identical results on different SSE versions, or between the hardware intrinsics and the software fallbacks."
$nl
"In particular, horizontal operations on " { $snippet "float-4" } " and " { $snippet "float-8" } " are affected by this. They are computed with lower precision in intrinsics than the software fallback. Horizontal operations include anything involving adding together the components of a vector, such as " { $link sum } " or " { $link normalize } "." ;

ARTICLE: "math.vectors.simd" "Hardware vector arithmetic (SIMD)"
"The " { $vocab-link "math.vectors.simd" } " vocabulary extends the " { $vocab-link "math.vectors" } " vocabulary to support efficient vector arithmetic on small, fixed-size vectors."

ARTICLE: "math.vectors.simd.support" "Supported SIMD instruction sets and operations"
"At present, the SIMD support makes use of a subset of SSE up to SSE4.1. The subset used depends on the current CPU type."
$nl
"SSE1 only supports single-precision SIMD (" { $snippet "float-4" } ")."
$nl
"SSE2 introduces double-precision SIMD (" { $snippet "double-2" } ") and integer SIMD (all types). Integer SIMD is missing a few features; in particular, the " { $link vmin } " and " { $link vmax } " operations only work on " { $snippet "uchar-16" } " and " { $snippet "short-8" } "."
$nl
"SSE3 introduces horizontal adds (summing all components of a single vector register), which are useful for computing dot products. Where available, SSE3 operations are used to speed up " { $link sum } ", " { $link v. } ", " { $link norm-sq } ", " { $link norm } ", and " { $link distance } "."
$nl
