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mat/big: more optimal Karatsuba threshold 

benchmark           old ns/op    new ns/op    delta
BenchmarkHilbert      6253043      6267289   +0.23%
BenchmarkMul         45355940     39490633  -12.93%

R=r
CC=golang-dev
https://golang.org/cl/6355104
This commit is contained in:
Robert Griesemer 2012-07-12 14:19:09 -07:00
parent 98ca655919
commit 6a135a0894
1 changed files with 1 additions and 1 deletions
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2
src/pkg/math/big/nat.go
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@ -236,7 +236,7 @@ func karatsubaSub(z, x nat, n int) {
// Operands that are shorter than karatsubaThreshold are multiplied using // Operands that are shorter than karatsubaThreshold are multiplied using
// "grade school" multiplication; for longer operands the Karatsuba algorithm // "grade school" multiplication; for longer operands the Karatsuba algorithm
// is used. // is used.
var karatsubaThreshold int = 32 // computed by calibrate.go var karatsubaThreshold int = 40 // computed by calibrate.go
// karatsuba multiplies x and y and leaves the result in z. // karatsuba multiplies x and y and leaves the result in z.
// Both x and y must have the same length n and n must be a // Both x and y must have the same length n and n must be a