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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
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// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Make sure we reuse large constant loads, if we can.
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// See issue 33580.
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package codegen
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const (
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A = 7777777777777777
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B = 8888888888888888
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)
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func f(x, y uint64) uint64 {
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p := x & A
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q := y & A
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r := x & B
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// amd64:-"MOVQ.*8888888888888888"
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s := y & B
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return p * q * r * s
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}
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