From 1b73c79234a1597f1f8b11cff5e01b935f6817a2 Mon Sep 17 00:00:00 2001 From: Jeffrey Wilcke Date: Wed, 2 Nov 2016 12:43:15 +0100 Subject: 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 --- core/vm/instructions.go | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'core') 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) { -- cgit