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cmd/internal/obj: make arm64 use RegTo2 instead of a full fledged Addr To2

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It shrinks Prog type from 448 bytes down to 376 bytes on amd64.

It also makes sense, because I don't know of any modern architecture
that have instructions which can write to two destinations, none of
which is a register (even x86 doesn't have such instructions).

Change-Id: I3061f1c9ac93d79ee2b92ecb9049641d0e0f6300
Reviewed-on: https://go-review.googlesource.com/10330
Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Shenghou Ma 2015-05-21 17:51:34 -04:00 • committed by Minux Ma
parent 4e4c1f9c4d
commit 0f27b91522
6 changed files with 11 additions and 11 deletions
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4
src/cmd/internal/obj/util.go
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@ -327,8 +327,8 @@ func (p *Prog) String() string {
if p.To.Type != TYPE_NONE {
fmt.Fprintf(&buf, "%s%v", sep, Dconv(p, &p.To))
}
if p.To2.Type != TYPE_NONE {
fmt.Fprintf(&buf, "%s%v", sep, Dconv(p, &p.To2))
if p.RegTo2 != REG_NONE {
fmt.Fprintf(&buf, "%s%v", sep, Rconv(int(p.RegTo2)))
}
return buf.String()
}