/
githubmirror
/
go
Обзор
Документация
Войти
/
githubmirror
/
go
Код
Запросы
0
Пакеты
0
Релизы
0
Аналитика
Безопасность
master
test/fixedbugs/issue68227.go
43 строки
1 KB
Keith Randall
cmd/compile: don't elide zero extension on top of signed values
28 июн 2024, 18:25
28 июн 2024, 18:25
7f90b96
Код
Авторство
О чём код?
// run // Copyright 2024 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" ) type someType []uint64 func (s *someType) push(v uint64) { *s = append(*s, v) } func (s *someType) problematicFn(x1Lo, x1Hi, x2Lo, x2Hi uint64) { r1 := int32(int16(x1Lo>>0)) * int32(int16(x2Lo>>0)) g() r3 := int32(int16(x1Lo>>32)) * int32(int16(x2Lo>>32)) r4 := int32(int16(x1Lo>>48)) * int32(int16(x2Lo>>48)) r5 := int32(int16(x1Hi>>0)) * int32(int16(x2Hi>>0)) r7 := int32(int16(x1Hi>>32)) * int32(int16(x2Hi>>32)) r8 := int32(int16(x1Hi>>48)) * int32(int16(x2Hi>>48)) s.push(uint64(uint32(r1)) | (uint64(uint32(r3+r4)) << 32)) s.push(uint64(uint32(r5)) | (uint64(uint32(r7+r8)) << 32)) } //go:noinline func g() { } func main() { s := &someType{} s.problematicFn(0x1000100010001, 0x1000100010001, 0xffffffffffffffff, 0xffffffffffffffff) for i := 0; i < 2; i++ { if got, want := (*s)[i], uint64(0xfffffffeffffffff); got != want { fmt.Printf("s[%d]=%x, want %x\n", i, got, want) } } }