Contents

# Fvec Syntax and Notation

This reference uses the following conventions for syntax and return values.

## Fvec Classes Syntax Notation

Fvec classes use one of the following the syntax conventions, where
• [operator]
is an operator (for example,
&, |, or ^
)
• [Fvec_Class]
is any
Fvec
class (
F64vec2
,
F32vec4
, or
F32vec1
)
• R
,
A
,
B
are declared
Fvec
variables of the type indicated
Syntax Convention One
Syntax:
`[Fvec_Class] R = [Fvec_Class] A [operator][Ivec_Class] B;`
Example:
`F64vec2 R = F64vec2 A & F64vec2 B;`
Syntax Convention Two
Syntax:
`[Fvec_Class] R = [operator]([Fvec_Class] A,[Fvec_Class] B);`
Example:
`F64vec2 R = andnot(F64vec2 A, F64vec2 B);`
Syntax Convention Three
Syntax:
`[Fvec_Class] R [operator]= [Fvec_Class] A;`
Example:
`F64vec2 R &= F64vec2 A;`

## Return Value Notation

Because the
Fvec
classes have packed elements, the return values typically follow the conventions presented in the following table.
F32vec4
returns four single-precision, floating-point values (R0, R1, R2, and R3);
F64vec2
returns two double-precision, floating-point values, and
F32vec1
returns the lowest single-precision floating-point value (R0).
Syntax Convention One Example
Syntax Convention Two Example
Syntax Convention Three Example
F32vec4
F64vec2
F32vec1
R0 := A0 & B0;
R0 := A0 andnot B0;
R0 &= A0;
x
x
x
R1 := A1 & B1;
R1 := A1 andnot B1;
R1 &= A1;
x
x
N/A
R2 := A2 & B2;
R2 := A2 andnot B2;
R2 &= A2;
x
N/A
N/A
R3 := A3 & B3
R3 := A3 andhot B3;
R3 &= A3;
x
N/A
N/A

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