mirror of
https://github.com/golang/go
synced 2024-11-05 14:56:10 -07:00
72dc9ab191
For commuting ops, check whether the second argument is dead before checking if the first argument is rematerializeable. Reusing the register holding a dead value is always best. Fixes #33580 Change-Id: I7372cfc03d514e6774d2d9cc727a3e6bf6ce2657 Reviewed-on: https://go-review.googlesource.com/c/go/+/199559 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
26 lines
459 B
Go
26 lines
459 B
Go
// asmcheck
|
|
|
|
// Copyright 2019 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.
|
|
|
|
// Make sure we reuse large constant loads, if we can.
|
|
// See issue 33580.
|
|
|
|
package codegen
|
|
|
|
const (
|
|
A = 7777777777777777
|
|
B = 8888888888888888
|
|
)
|
|
|
|
func f(x, y uint64) uint64 {
|
|
p := x & A
|
|
q := y & A
|
|
r := x & B
|
|
// amd64:-"MOVQ.*8888888888888888"
|
|
s := y & B
|
|
|
|
return p * q * r * s
|
|
}
|