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|
// skip
// NOTE: the actual tests to run are rotate[0123].go
// Copyright 2012 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.
// Generate test of shift and rotate by constants.
// The output is compiled and run.
//
// The integer type depends on the value of mode (rotate direction,
// signedness).
package main
import (
"bufio"
"flag"
"fmt"
"os"
"strings"
)
func main() {
flag.Parse()
b := bufio.NewWriter(os.Stdout)
defer b.Flush()
fmt.Fprintf(b, "%s\n", prolog)
for logBits := uint(3); logBits <= 6; logBits++ {
typ := fmt.Sprintf("int%d", 1<<logBits)
fmt.Fprint(b, strings.Replace(checkFunc, "XXX", typ, -1))
fmt.Fprint(b, strings.Replace(checkFunc, "XXX", "u"+typ, -1))
gentest(b, 1<<logBits, mode&1 != 0, mode&2 != 0)
}
}
const prolog = `
package main
import (
"fmt"
"os"
)
var (
i8 int8 = 0x12
i16 int16 = 0x1234
i32 int32 = 0x12345678
i64 int64 = 0x123456789abcdef0
ui8 uint8 = 0x12
ui16 uint16 = 0x1234
ui32 uint32 = 0x12345678
ui64 uint64 = 0x123456789abcdef0
ni8 = ^i8
ni16 = ^i16
ni32 = ^i32
ni64 = ^i64
nui8 = ^ui8
nui16 = ^ui16
nui32 = ^ui32
nui64 = ^ui64
)
var nfail = 0
func main() {
if nfail > 0 {
fmt.Printf("BUG\n")
}
}
`
const checkFunc = `
func check_XXX(desc string, have, want XXX) {
if have != want {
nfail++
fmt.Printf("%s = %T(%#x), want %T(%#x)\n", desc, have, have, want, want)
if nfail >= 100 {
fmt.Printf("BUG: stopping after 100 failures\n")
os.Exit(0)
}
}
}
`
var (
uop = [2]func(x, y uint64) uint64{
func(x, y uint64) uint64 {
return x | y
},
func(x, y uint64) uint64 {
return x ^ y
},
}
iop = [2]func(x, y int64) int64{
func(x, y int64) int64 {
return x | y
},
func(x, y int64) int64 {
return x ^ y
},
}
cop = [2]byte{'|', '^'}
)
func gentest(b *bufio.Writer, bits uint, unsigned, inverted bool) {
fmt.Fprintf(b, "func init() {\n")
defer fmt.Fprintf(b, "}\n")
n := 0
// Generate tests for left/right and right/left.
for l := uint(0); l <= bits; l++ {
for r := uint(0); r <= bits; r++ {
for o, op := range cop {
typ := fmt.Sprintf("int%d", bits)
v := fmt.Sprintf("i%d", bits)
if unsigned {
typ = "u" + typ
v = "u" + v
}
v0 := int64(0x123456789abcdef0)
if inverted {
v = "n" + v
v0 = ^v0
}
expr1 := fmt.Sprintf("%s<<%d %c %s>>%d", v, l, op, v, r)
expr2 := fmt.Sprintf("%s>>%d %c %s<<%d", v, r, op, v, l)
var result string
if unsigned {
v := uint64(v0) >> (64 - bits)
v = uop[o](v<<l, v>>r)
v <<= 64 - bits
v >>= 64 - bits
result = fmt.Sprintf("%#x", v)
} else {
v := int64(v0) >> (64 - bits)
v = iop[o](v<<l, v>>r)
v <<= 64 - bits
v >>= 64 - bits
result = fmt.Sprintf("%#x", v)
}
fmt.Fprintf(b, "\tcheck_%s(%q, %s, %s(%s))\n", typ, expr1, expr1, typ, result)
fmt.Fprintf(b, "\tcheck_%s(%q, %s, %s(%s))\n", typ, expr2, expr2, typ, result)
// Chop test into multiple functions so that there's not one
// enormous function to compile/link.
// All the functions are named init so we don't have to do
// anything special to call them. ☺
if n++; n >= 50 {
fmt.Fprintf(b, "}\n")
fmt.Fprintf(b, "func init() {\n")
n = 0
}
}
}
}
}
|
