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// run
// Copyright 2023 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
func main() {
var b [8]byte
one := uint8(1)
f16(&one, b[:2])
if b[1] != 1 {
println("2-byte value lost")
}
f32(&one, b[:4])
if b[3] != 1 {
println("4-byte value lost")
}
f64(&one, b[:8])
if b[7] != 1 {
println("8-byte value lost")
}
}
//go:noinline
func f16(p *uint8, b []byte) {
_ = b[1] // bounds check
x := *p // load a byte
y := uint16(x) // zero extend to 16 bits
b[0] = byte(y >> 8) // compute ROLW
b[1] = byte(y)
nop() // spill/restore ROLW
b[0] = byte(y >> 8) // use ROLW
b[1] = byte(y)
}
//go:noinline
func f32(p *uint8, b []byte) {
_ = b[3] // bounds check
x := *p // load a byte
y := uint32(x) // zero extend to 32 bits
b[0] = byte(y >> 24) // compute ROLL
b[1] = byte(y >> 16)
b[2] = byte(y >> 8)
b[3] = byte(y)
nop() // spill/restore ROLL
b[0] = byte(y >> 24) // use ROLL
b[1] = byte(y >> 16)
b[2] = byte(y >> 8)
b[3] = byte(y)
}
//go:noinline
func f64(p *uint8, b []byte) {
_ = b[7] // bounds check
x := *p // load a byte
y := uint64(x) // zero extend to 64 bits
b[0] = byte(y >> 56) // compute ROLQ
b[1] = byte(y >> 48)
b[2] = byte(y >> 40)
b[3] = byte(y >> 32)
b[4] = byte(y >> 24)
b[5] = byte(y >> 16)
b[6] = byte(y >> 8)
b[7] = byte(y)
nop() // spill/restore ROLQ
b[0] = byte(y >> 56) // use ROLQ
b[1] = byte(y >> 48)
b[2] = byte(y >> 40)
b[3] = byte(y >> 32)
b[4] = byte(y >> 24)
b[5] = byte(y >> 16)
b[6] = byte(y >> 8)
b[7] = byte(y)
}
//go:noinline
func nop() {
}