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vm: use truncated division in MOD

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Mimic C#'s `%` behavior.
Related 4b44190 (#773).
This commit is contained in:
Evgenii Stratonikov 2020-04-05 17:34:14 +03:00
parent c0b5271386
commit 0023c4f1f6
2 changed files with 17 additions and 9 deletions
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2
pkg/vm/vm.go
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@ -794,7 +794,7 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
a := v.estack.Pop().BigInt()
v.checkBigIntSize(a)
v.estack.PushVal(new(big.Int).Mod(a, b))
v.estack.PushVal(new(big.Int).Rem(a, b))
case opcode.SHL, opcode.SHR:
b := v.estack.Pop().BigInt().Int64()

24
pkg/vm/vm_test.go
View file

@ -844,11 +844,10 @@ func TestMULBigResult(t *testing.T) {
checkVMFailed(t, vm)
}
func TestDiv(t *testing.T) {
prog := makeProgram(opcode.DIV)
runCase := func(p, q, result int64) func(t *testing.T) {
func TestDivMod(t *testing.T) {
runCase := func(op opcode.Opcode, p, q, result int64) func(t *testing.T) {
return func(t *testing.T) {
vm := load(prog)
vm := load(makeProgram(op))
vm.estack.PushVal(p)
vm.estack.PushVal(q)
runVM(t, vm)
@ -856,10 +855,19 @@ func TestDiv(t *testing.T) {
}
}
t.Run("positive/positive", runCase(5, 2, 2))
t.Run("positive/negative", runCase(5, -2, -2))
t.Run("negative/positive", runCase(-5, 2, -2))
t.Run("negative/negative", runCase(-5, -2, 2))
t.Run("DIV", func(t *testing.T) {
t.Run("positive/positive", runCase(opcode.DIV, 5, 2, 2))
t.Run("positive/negative", runCase(opcode.DIV, 5, -2, -2))
t.Run("negative/positive", runCase(opcode.DIV, -5, 2, -2))
t.Run("negative/negative", runCase(opcode.DIV, -5, -2, 2))
})
t.Run("MOD", func(t *testing.T) {
t.Run("positive/positive", runCase(opcode.MOD, 5, 2, 1))
t.Run("positive/negative", runCase(opcode.MOD, 5, -2, 1))
t.Run("negative/positive", runCase(opcode.MOD, -5, 2, -1))
t.Run("negative/negative", runCase(opcode.MOD, -5, -2, -1))
})
}