go shift 源码
golang shift 代码
文件路径：/test/ken/shift.go
// run
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Test shift.
package main
var ians [18]int;
var uans [18]uint;
var pass string;
func
testi(i int, t1,t2,t3 int) {
n := ((t1*3) + t2)*2 + t3;
if i != ians[n] {
print("itest ", t1,t2,t3,pass,
" is ", i, " sb ", ians[n], "\n");
}
}
func
index(t1,t2,t3 int) int {
return ((t1*3) + t2)*2 + t3;
}
func
testu(u uint, t1,t2,t3 int) {
n := index(t1,t2,t3);
if u != uans[n] {
print("utest ", t1,t2,t3,pass,
" is ", u, " sb ", uans[n], "\n");
}
}
func
main() {
var i int;
var u,c uint;
/*
* test constant evaluations
*/
pass = "con"; // constant part
testi( int(1234) << 0, 0,0,0);
testi( int(1234) >> 0, 0,0,1);
testi( int(1234) << 5, 0,1,0);
testi( int(1234) >> 5, 0,1,1);
testi(int(-1234) << 0, 1,0,0);
testi(int(-1234) >> 0, 1,0,1);
testi(int(-1234) << 5, 1,1,0);
testi(int(-1234) >> 5, 1,1,1);
testu(uint(5678) << 0, 2,0,0);
testu(uint(5678) >> 0, 2,0,1);
testu(uint(5678) << 5, 2,1,0);
testu(uint(5678) >> 5, 2,1,1);
/*
* test variable evaluations
*/
pass = "var"; // variable part
for t1:=0; t1<3; t1++ { // +int, -int, uint
for t2:=0; t2<3; t2++ { // 0, +small, +large
for t3:=0; t3<2; t3++ { // <<, >>
switch t1 {
case 0: i = 1234;
case 1: i = -1234;
case 2: u = 5678;
}
switch t2 {
case 0: c = 0;
case 1: c = 5;
case 2: c = 1025;
}
switch t3 {
case 0: i <<= c; u <<= c;
case 1: i >>= c; u >>= c;
}
switch t1 {
case 0: testi(i,t1,t2,t3);
case 1: testi(i,t1,t2,t3);
case 2: testu(u,t1,t2,t3);
}
}
}
}
}
func
init() {
/*
* set the 'correct' answer
*/
ians[index(0,0,0)] = 1234;
ians[index(0,0,1)] = 1234;
ians[index(0,1,0)] = 39488;
ians[index(0,1,1)] = 38;
ians[index(0,2,0)] = 0;
ians[index(0,2,1)] = 0;
ians[index(1,0,0)] = -1234;
ians[index(1,0,1)] = -1234;
ians[index(1,1,0)] = -39488;
ians[index(1,1,1)] = -39;
ians[index(1,2,0)] = 0;
ians[index(1,2,1)] = -1;
uans[index(2,0,0)] = 5678;
uans[index(2,0,1)] = 5678;
uans[index(2,1,0)] = 181696;
uans[index(2,1,1)] = 177;
uans[index(2,2,0)] = 0;
uans[index(2,2,1)] = 0;
}
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