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native: clarify comment for Ilaenv

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This commit is contained in:
Vladimir Chalupecky
2016-06-01 10:50:20 +09:00
parent 313ae61d37
commit 0dbd99df90
1 changed files with 5 additions and 5 deletions
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10
native/ilaenv.go
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@@ -5,10 +5,11 @@
package native package native
// Ilaenv returns algorithm tuning parameters for the algorithm given by the // Ilaenv returns algorithm tuning parameters for the algorithm given by the
// input string. ispec specifies the parameter to return. // input string. ispec specifies the parameter to return:
// 1: The optimal block size // 1: The optimal block size for a blocked algorithm.
// 2: The minimum block size for which the algorithm should be used. // 2: The minimum block size for a blocked algorithm.
// 3: The crossover point below which an unblocked routine should be used. // 3: The block size of unprocessed data at which a blocked algorithm should
// crossover to an unblocked version.
// 4: The number of shifts. // 4: The number of shifts.
// 5: The minimum column dimension for blocking to be used. // 5: The minimum column dimension for blocking to be used.
// 6: The crossover point for SVD (to use QR factorization or not). // 6: The crossover point for SVD (to use QR factorization or not).
@@ -21,7 +22,6 @@ package native
// Ilaenv is an internal routine. It is exported for testing purposes. // Ilaenv is an internal routine. It is exported for testing purposes.
func (Implementation) Ilaenv(ispec int, s string, opts string, n1, n2, n3, n4 int) int { func (Implementation) Ilaenv(ispec int, s string, opts string, n1, n2, n3, n4 int) int {
// TODO(btracey): Replace this with a constant lookup? A list of constants? // TODO(btracey): Replace this with a constant lookup? A list of constants?
// TODO: What is the difference between 2 and 3?
sname := s[0] == 'S' || s[0] == 'D' sname := s[0] == 'S' || s[0] == 'D'
cname := s[0] == 'C' || s[0] == 'Z' cname := s[0] == 'C' || s[0] == 'Z'
if !sname && !cname { if !sname && !cname {