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cmd/compile: use ISEL, cleanup use of zero & extensions

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Abandoned earlier efforts to expose zero register,
but left it in numbering to decrease squirrelyness of
register allocator.

ISELrelOp used in code generation of bool := x relOp y.
Some patterns added to better elide zero case and
some sign extension.

Updates: #17109

Change-Id: Ida7839f0023ca8f0ffddc0545f0ac269e65b05d9
Reviewed-on: https://go-review.googlesource.com/29380
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
David Chase 2016-09-16 15:02:47 -07:00
parent dcbbd319e9
commit cddddbc623
12 changed files with 826 additions and 543 deletions
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14
src/cmd/compile/internal/gc/plive.go
View file

@ -624,6 +624,20 @@ func progeffects(prog *obj.Prog, vars []*Node, uevar bvec, varkill bvec, avarini
}
}
if info.Flags&From3Read != 0 {
from := prog.From3
if from.Node != nil && from.Sym != nil {
n := from.Node.(*Node)
if pos := liveIndex(n, vars); pos >= 0 {
if n.Addrtaken {
bvset(avarinit, pos)
} else {
bvset(uevar, pos)
}
}
}
}
if info.Flags&(RightRead|RightWrite|RightAddr) != 0 {
to := &prog.To
if to.Node != nil && to.Sym != nil {