simplify bigMSB (#9998)

65837359 · zhiqiangxu · GitHub · 2d03c726 · 65837359
Commit 65837359 authored Mar 31, 2024 by zhiqiangxu Committed by GitHub Mar 30, 2024
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position.go op-challenger/game/fault/types/position.go +1 -5

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--- a/op-challenger/game/fault/types/position.go
+++ b/op-challenger/game/fault/types/position.go
@@ -146,9 +146,5 @@ func bigMSB(x *big.Int) Depth {
 	if x.Cmp(big.NewInt(0)) == 0 {
 		return 0
 	}
-	out := Depth(0)
-	for ; x.Cmp(big.NewInt(0)) != 0; out++ {
-		x = new(big.Int).Rsh(x, 1)
-	}
-	return out - 1
+	return Depth(x.BitLen() - 1)
 }