Contents

# Naming Conventions for BLAS Routines

BLAS routine names have the following structure:
<
character
> <
name
> <
mod
> ( )
The
<
character
>
field indicates the data type:
s
real, single precision
c
complex, single precision
d
real, double precision
z
complex, double precision
Some routines and functions can have combined character codes, such as
sc
or
dz
.
For example, the function
scasum
uses a complex input array and returns a real value.
The
<
name
>
field, in BLAS level 1, indicates the operation type. For example, the BLAS level 1 routines
?dot
,
?rot
,
?swap
compute a vector dot product, vector rotation, and vector swap, respectively.
In BLAS level 2 and 3,
<
name
>
reflects the matrix argument type:
ge
general matrix
gb
general band matrix
sy
symmetric matrix
sp
symmetric matrix (packed storage)
sb
symmetric band matrix
he
Hermitian matrix
hp
Hermitian matrix (packed storage)
hb
Hermitian band matrix
tr
triangular matrix
tp
triangular matrix (packed storage)
tb
triangular band matrix.
The
<
mod
>
field, if present, provides additional details of the operation. BLAS level 1 names can have the following characters in the
<
mod
>
field:
c
conjugated vector
u
unconjugated vector
g
Givens rotation construction
m
modified Givens rotation
mg
modified Givens rotation construction
BLAS level 2 names can have the following characters in the
<
mod
>
field:
mv
matrix-vector product
sv
solving a system of linear equations with a single unknown vector
r
rank-1 update of a matrix
r2
rank-2 update of a matrix.
BLAS level 3 names can have the following characters in the
<
mod
>
field:
mm
matrix-matrix product
sm
solving a system of linear equations with multiple unknown vectors
rk
rank-
k
update of a matrix
r2k
rank-2
k
update of a matrix.
The examples below illustrate how to interpret BLAS routine names:
ddot
<d> <dot>
: double-precision real vector-vector dot product
cdotc
<c> <dot> <c>
: complex vector-vector dot product, conjugated
scasum
<sc> <asum>
: sum of magnitudes of vector elements, single precision real output and single precision complex input
cdotu
<c> <dot> <u>
: vector-vector dot product, unconjugated, complex
sgemv
<s> <ge> <mv>
: matrix-vector product, general matrix, single precision
ztrmm
<z> <tr> <mm>
: matrix-matrix product, triangular matrix, double-precision complex.
Sparse BLAS level 1 naming conventions are similar to those of BLAS level 1. For more information, see Naming Conventions.

#### Product and Performance Information

1

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Notice revision #20110804