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remove mentions of 256-bit vectors from math.vectors.simd

db4
Joe Groff 2009-11-24 22:23:22 -08:00
parent 3f5b3c2c1b
commit 9128f1f160
1 changed files with 5 additions and 15 deletions
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20
basis/math/vectors/simd/simd-docs.factor
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@ -19,9 +19,9 @@ $nl
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" } " and " { $snippet "float-8" } ")."
"SSE1 only supports single-precision SIMD (" { $snippet "float-4" } ")."
$nl
"SSE2 introduces double-precision SIMD (" { $snippet "double-2" } " and " { $snippet "double-4" } ") 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" } "."
"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
@ -40,24 +40,14 @@ $nl
{ $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"
@ -88,8 +78,8 @@ SIMD: double
SYMBOLS: x y ;
[
double-4{ 1.5 2.0 3.7 0.4 } x set
double-4{ 1.5 2.0 3.7 0.4 } y set
float-4{ 1.5 2.0 3.7 0.4 } x set
float-4{ 1.5 2.0 3.7 0.4 } y set
x get y get v+
] optimizer-report.""" }
"The following word benefits from SIMD optimization, because it begins with an unsafe declaration:"
@ -183,7 +173,7 @@ $nl
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 } "." ;
"In particular, horizontal operations on " { $snippet "float-4" } " vectors 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."