summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--lib/rng.go46
1 files changed, 0 insertions, 46 deletions
diff --git a/lib/rng.go b/lib/rng.go
index 6f57324..94cbd6c 100644
--- a/lib/rng.go
+++ b/lib/rng.go
@@ -26,10 +26,6 @@ type MTRand struct {
initialized bool
}
-// Stores state of MT19937 generator.
-var mtGenSt []uint32 = make([]uint32, mtCoefN)
-var mtIndex uint32 = mtCoefN + 1
-
var mtLowerMask uint32 = (1 << mtCoefR) - 1
var mtUpperMask uint32 = 0xFFFFFFFF & (^mtLowerMask)
@@ -43,15 +39,6 @@ func (r *MTRand) Seed(s uint32) {
r.initialized = true
}
-func MTSeed(seed uint32) {
- mtIndex = mtCoefN
- mtGenSt[0] = seed
- for i := uint32(1); i < mtCoefN; i++ {
- mtGenSt[i] = (0xFFFFFFFF &
- (mtF*(mtGenSt[i-1]^(mtGenSt[i-1]>>(mtCoefW-2))) + i))
- }
-}
-
func (r *MTRand) Extract() uint32 {
if !r.initialized || r.index >= mtCoefN {
if !r.initialized {
@@ -72,26 +59,6 @@ func (r *MTRand) Extract() uint32 {
return y
}
-func MTExtract() uint32 {
- if mtIndex >= mtCoefN {
- if mtIndex > mtCoefN {
- MTSeed(5489)
- }
- mtTwist()
- }
-
- y := mtGenSt[mtIndex]
- y = y ^ ((y >> mtCoefU) & mtCoefD)
- y = y ^ ((y << mtCoefS) & mtCoefB)
- y = y ^ ((y << mtCoefT) & mtCoefC)
- y = y ^ (y >> mtCoefL)
-
- mtIndex = mtIndex + 1
-
- r := 0xFFFFFFFF & y
- return r
-}
-
func (r *MTRand) twist() {
for i := uint32(0); i < mtCoefN-1; i++ {
x := (r.genSt[i] & mtUpperMask) +
@@ -104,16 +71,3 @@ func (r *MTRand) twist() {
}
r.index = 0
}
-
-func mtTwist() {
- for i := uint32(0); i < mtCoefN-1; i++ {
- x := (mtGenSt[i] & mtUpperMask) +
- (mtGenSt[(i+1)%mtCoefN] & mtLowerMask)
- xA := x >> 1
- if x%2 != 0 { // lowest bit of x is 1
- xA = xA ^ mtCoefA
- }
- mtGenSt[i] = mtGenSt[(i+mtCoefM)%mtCoefN] ^ xA
- }
- mtIndex = 0
-}