mirror of
https://github.com/golang/go
synced 2024-11-14 14:10:29 -07:00
e80f6a4de1
CVTSS2SQ's rounding mode is controlled by the RC field of MXCSR;
as we specifically need truncate semantic, we should use CVTTSS2SQ.
Fixes #3804.
R=rsc, r
CC=golang-dev
https://golang.org/cl/6352079
106 lines
2.0 KiB
Go
106 lines
2.0 KiB
Go
// runoutput
|
|
|
|
// 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.
|
|
|
|
// Issue 3804
|
|
// test all possible float -> integer conversions
|
|
|
|
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
var (
|
|
intWidths = []int{8, 16, 32, 64} // int%d and uint%d
|
|
floatWidths = []int{32, 64} // float%d
|
|
)
|
|
|
|
func main() {
|
|
|
|
var names, funcs bytes.Buffer
|
|
|
|
for _, iWidth := range intWidths {
|
|
for _, typ := range []string{"int", "uint"} {
|
|
var segs bytes.Buffer
|
|
itype := fmt.Sprintf("%s%d", typ, iWidth)
|
|
names.WriteString("\ttest" + itype + ",\n")
|
|
for _, fWidth := range floatWidths {
|
|
ftype := fmt.Sprintf("float%d", fWidth)
|
|
seg := strings.Replace(testSegment, "$F", ftype, -1)
|
|
seg = strings.Replace(seg, "$I", itype, -1)
|
|
segs.WriteString(seg)
|
|
}
|
|
body := strings.Replace(testFunc, "$I", itype, -1)
|
|
if typ[0] == 'u' {
|
|
body = strings.Replace(body, "$TEST", " || i < 0", 1)
|
|
} else {
|
|
body = strings.Replace(body, "$TEST", "", 1)
|
|
}
|
|
body = strings.Replace(body, "$TESTSEGMENTS", segs.String(), 1)
|
|
funcs.WriteString(body)
|
|
}
|
|
}
|
|
|
|
program = strings.Replace(program, "$NAMES", names.String(), 1)
|
|
program = strings.Replace(program, "$FUNCS", funcs.String(), 1)
|
|
fmt.Print(program)
|
|
}
|
|
|
|
const testSegment = `
|
|
f$F := $F(f)
|
|
if math.Abs(float64(f$F) - f) < 0.05 {
|
|
if v := $I(f$F); v != $I(i) {
|
|
fmt.Printf("$I($F(%f)) = %v, expected %v\n", f, v, i)
|
|
}
|
|
}`
|
|
|
|
const testFunc =
|
|
`func test$I(f float64, i int64) {
|
|
if i != int64($I(i))$TEST {
|
|
return
|
|
}
|
|
$TESTSEGMENTS
|
|
}
|
|
`
|
|
|
|
var program =
|
|
`package main
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
)
|
|
|
|
var tests = []struct {
|
|
f float64
|
|
i int64
|
|
}{
|
|
{39.7, 39},
|
|
{-39.7, -39},
|
|
{258.6, 258},
|
|
{-258.6, -258},
|
|
{65538.9, 65538},
|
|
{-65538.9, -65538},
|
|
{4294967298.8, 4294967298},
|
|
{-4294967298.8, -4294967298},
|
|
}
|
|
|
|
var funcs = []func(float64, int64){
|
|
$NAMES
|
|
}
|
|
|
|
$FUNCS
|
|
func main() {
|
|
for _, t := range tests {
|
|
for _, f := range funcs {
|
|
f(t.f, t.i)
|
|
}
|
|
}
|
|
}
|
|
`
|