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| author | Jeffrey Wilcke <jeffrey@ethereum.org> | 2016-11-02 19:43:15 +0800 |
|---|---|---|
| committer | Péter Szilágyi <peterke@gmail.com> | 2016-11-02 19:43:15 +0800 |
| commit | 1b73c79234a1597f1f8b11cff5e01b935f6817a2 (patch) | |
| tree | 7ef33a6db6a9c4cb906246423c61166479241570 /core | |
| parent | 36956da4d2a9e5d9099179f9ce8690b2775b560a (diff) | |
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common/math, core/vm: implement fast EXP (#3214)
* common/math, core/vm: implement fast EXP.
Courtesy @chfast & @karalabe
* common/math: fix go vet issues on exp calculation
Diffstat (limited to 'core')
| -rw-r--r-- | core/vm/instructions.go | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/core/vm/instructions.go b/core/vm/instructions.go index 3352877c1..94a8c6348 100644 --- a/core/vm/instructions.go +++ b/core/vm/instructions.go @@ -21,6 +21,7 @@ import ( "math/big" "github.com/ethereum/go-ethereum/common" + "github.com/ethereum/go-ethereum/common/math" "github.com/ethereum/go-ethereum/crypto" "github.com/ethereum/go-ethereum/params" ) @@ -192,8 +193,8 @@ func opSmod(instr instruction, pc *uint64, env Environment, contract *Contract, } func opExp(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) { - x, y := stack.pop(), stack.pop() - stack.push(U256(x.Exp(x, y, Pow256))) + base, exponent := stack.pop(), stack.pop() + stack.push(math.Exp(base, exponent)) } func opSignExtend(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) { |