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// Copyright 2016 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.
package main
import (
"fmt"
T "runtime/internal/sys"
)
var A = []uint64{0x0102030405060708, 0x1122334455667788}
var B = []uint64{0x0807060504030201, 0x8877665544332211}
var errors int
func logf(f string, args ...interface{}) {
errors++
fmt.Printf(f, args...)
if errors > 100 { // 100 is enough spewage
panic("100 errors is plenty is enough")
}
}
func test(i int, x uint64) {
t := T.TrailingZeros64(x) // ERROR "intrinsic substitution for TrailingZeros64"
if i != t {
logf("TrailingZeros64(0x%x) expected %d but got %d\n", x, i, t)
}
x = -x
t = T.TrailingZeros64(x) // ERROR "intrinsic substitution for TrailingZeros64"
if i != t {
logf("TrailingZeros64(0x%x) expected %d but got %d\n", x, i, t)
}
if i <= 32 {
x32 := uint32(x)
t32 := T.TrailingZeros32(x32) // ERROR "intrinsic substitution for TrailingZeros32"
if i != t32 {
logf("TrailingZeros32(0x%x) expected %d but got %d\n", x32, i, t32)
}
x32 = -x32
t32 = T.TrailingZeros32(x32) // ERROR "intrinsic substitution for TrailingZeros32"
if i != t32 {
logf("TrailingZeros32(0x%x) expected %d but got %d\n", x32, i, t32)
}
}
}
func main() {
// Test Bswap first because the other test relies on it
// working correctly (to implement bit reversal).
for i := range A {
x := A[i]
y := B[i]
X := T.Bswap64(x) // ERROR "intrinsic substitution for Bswap64"
Y := T.Bswap64(y) // ERROR "intrinsic substitution for Bswap64"
if y != X {
logf("Bswap64(0x%08x) expected 0x%08x but got 0x%08x\n", x, y, X)
}
if x != Y {
logf("Bswap64(0x%08x) expected 0x%08x but got 0x%08x\n", y, x, Y)
}
x32 := uint32(X)
y32 := uint32(Y >> 32)
X32 := T.Bswap32(x32) // ERROR "intrinsic substitution for Bswap32"
Y32 := T.Bswap32(y32) // ERROR "intrinsic substitution for Bswap32"
if y32 != X32 {
logf("Bswap32(0x%08x) expected 0x%08x but got 0x%08x\n", x32, y32, X32)
}
if x32 != Y32 {
logf("Bswap32(0x%08x) expected 0x%08x but got 0x%08x\n", y32, x32, Y32)
}
}
// Zero is a special case, be sure it is done right.
if T.TrailingZeros32(0) != 32 { // ERROR "intrinsic substitution for TrailingZeros32"
logf("TrailingZeros32(0) != 32")
}
if T.TrailingZeros64(0) != 64 { // ERROR "intrinsic substitution for TrailingZeros64"
logf("TrailingZeros64(0) != 64")
}
for i := 0; i <= 64; i++ {
for j := uint64(1); j <= 255; j += 2 {
for k := uint64(1); k <= 65537; k += 128 {
x := (j * k) << uint(i)
test(i, x)
}
}
}
}