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test/bench: faster fasta (mostly due to bufio fix)

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R=r
https://golang.org/cl/165083
This commit is contained in:
Russ Cox 2009-12-07 19:39:09 -08:00
parent 0d3301a557
commit 86c0c54d27
1 changed files with 16 additions and 18 deletions
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34
test/bench/fasta.go
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@ -62,20 +62,6 @@ type AminoAcid struct {
c byte;
}
var lastrandom uint32 = 42
// Random number between 0.0 and 1.0
func myrandom() float {
const (
IM = 139968;
IA = 3877;
IC = 29573;
)
lastrandom = (lastrandom*IA + IC) % IM;
// Integer to float conversions are faster if the integer is signed.
return float(int32(lastrandom)) / IM;
}
func AccumulateProbabilities(genelist []AminoAcid) {
for i := 1; i < len(genelist); i++ {
genelist[i].p += genelist[i-1].p
@ -104,6 +90,14 @@ func RepeatFasta(s []byte, count int) {
}
}
var lastrandom uint32 = 42
const (
IM = 139968;
IA = 3877;
IC = 29573;
)
// Each element of genelist is a struct with a character and
// a floating point number p between 0 and 1.
// RandomFasta generates a random float r and
@ -117,11 +111,15 @@ func RandomFasta(genelist []AminoAcid, count int) {
for count > 0 {
line := min(WIDTH, count);
for pos := 0; pos < line; pos++ {
r := myrandom();
var i int;
for i = 0; genelist[i].p < r; i++ {
lastrandom = (lastrandom*IA + IC) % IM;
// Integer to float conversions are faster if the integer is signed.
r := float(int32(lastrandom)) / IM;
for _, v := range genelist {
if v.p >= r {
buf[pos] = v.c;
break;
}
}
buf[pos] = genelist[i].c;
}
buf[line] = '\n';
out.Write(buf[0 : line+1]);