core/vm: optimize osakaMultComplexity

cuiweixie · cuiweixie · commit 07ffc2528bf1 · 2025-11-04T23:21:39.000+08:00
diff --git a/core/vm/contracts.go b/core/vm/contracts.go
@@ -456,11 +456,10 @@ func osakaMultComplexity(x uint64) uint64 {
 	}
 	// For x > 32, return 2 * berlinMultComplexity(x)
 	result := berlinMultComplexity(x)
-	carry, result := bits.Mul64(result, 2)
-	if carry != 0 {
+	if result >= (1 << 63) { // overflow check
 		return math.MaxUint64
 	}
-	return result
+	return result << 1
 }
 
 // modexpIterationCount calculates the number of iterations for the modexp precompile.

Original file line number	Diff line number	Diff line change
`@@ -456,11 +456,10 @@ func osakaMultComplexity(x uint64) uint64 {`
`456`	`456`	`}`
`457`	`457`	`// For x > 32, return 2 * berlinMultComplexity(x)`
`458`	`458`	`result := berlinMultComplexity(x)`
`459`		`- carry, result := bits.Mul64(result, 2)`
`460`		`- if carry != 0 {`
	`459`	`+ if result >= (1 << 63) { // overflow check`
`461`	`460`	`return math.MaxUint64`
`462`	`461`	`}`
`463`		`- return result`
	`462`	`+ return result << 1`
`464`	`463`	`}`
`465`	`464`
`466`	`465`	`// modexpIterationCount calculates the number of iterations for the modexp precompile.`