mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-11-24 11:13:47 +08:00
8dc2499aa6
gotools/ * Makefile.am (go_cmd_cgo_files): Add ast_go118.go (check-go-tool): Copy golang.org/x/tools directories. * Makefile.in: Regenerate. Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/384695
69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
// Copyright 2014 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.
|
|
|
|
// Hashing algorithm inspired by
|
|
// wyhash: https://github.com/wangyi-fudan/wyhash/blob/ceb019b530e2c1c14d70b79bfa2bc49de7d95bc1/Modern%20Non-Cryptographic%20Hash%20Function%20and%20Pseudorandom%20Number%20Generator.pdf
|
|
|
|
//go:build 386 || arm || mips || mipsle || amd64p32 || armbe || m68k || mips64p32 || mips64p32le || nios2 || ppc || riscv || s390 || sh || shbe || sparc
|
|
|
|
package runtime
|
|
|
|
import "unsafe"
|
|
|
|
// For gccgo, use go:linkname to export compiler-called functions.
|
|
//
|
|
//go:linkname memhash
|
|
|
|
func memhash32(p unsafe.Pointer, seed uintptr) uintptr {
|
|
a, b := mix32(uint32(seed), uint32(4^hashkey[0]))
|
|
t := readUnaligned32(p)
|
|
a ^= t
|
|
b ^= t
|
|
a, b = mix32(a, b)
|
|
a, b = mix32(a, b)
|
|
return uintptr(a ^ b)
|
|
}
|
|
|
|
func memhash64(p unsafe.Pointer, seed uintptr) uintptr {
|
|
a, b := mix32(uint32(seed), uint32(8^hashkey[0]))
|
|
a ^= readUnaligned32(p)
|
|
b ^= readUnaligned32(add(p, 4))
|
|
a, b = mix32(a, b)
|
|
a, b = mix32(a, b)
|
|
return uintptr(a ^ b)
|
|
}
|
|
|
|
func memhash(p unsafe.Pointer, seed, s uintptr) uintptr {
|
|
if GOARCH == "386" && GOOS != "nacl" && useAeshash {
|
|
return aeshash(p, seed, s)
|
|
}
|
|
a, b := mix32(uint32(seed), uint32(s^hashkey[0]))
|
|
if s == 0 {
|
|
return uintptr(a ^ b)
|
|
}
|
|
for ; s > 8; s -= 8 {
|
|
a ^= readUnaligned32(p)
|
|
b ^= readUnaligned32(add(p, 4))
|
|
a, b = mix32(a, b)
|
|
p = add(p, 8)
|
|
}
|
|
if s >= 4 {
|
|
a ^= readUnaligned32(p)
|
|
b ^= readUnaligned32(add(p, s-4))
|
|
} else {
|
|
t := uint32(*(*byte)(p))
|
|
t |= uint32(*(*byte)(add(p, s>>1))) << 8
|
|
t |= uint32(*(*byte)(add(p, s-1))) << 16
|
|
b ^= t
|
|
}
|
|
a, b = mix32(a, b)
|
|
a, b = mix32(a, b)
|
|
return uintptr(a ^ b)
|
|
}
|
|
|
|
func mix32(a, b uint32) (uint32, uint32) {
|
|
c := uint64(a^uint32(hashkey[1])) * uint64(b^uint32(hashkey[2]))
|
|
return uint32(c), uint32(c >> 32)
|
|
}
|