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cmd/compile: stop adding implicit OKEY nodes

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Keys are uncommon in array and slice literals, and normalizing
OARRAYLIT and OSLICELIT nodes to always use OKEY ends up not reducing
complexity much. Instead, only create OKEY nodes to represent explicit
keys, and recalculate implicit keys when/where necessary.

Fixes #15350.

name       old time/op     new time/op     delta
Template       299ms ± 9%      299ms ±12%    ~           (p=0.694 n=28+30)
Unicode        165ms ± 7%      162ms ± 9%    ~           (p=0.084 n=27+27)
GoTypes        950ms ± 9%      963ms ± 5%    ~           (p=0.301 n=30+29)
Compiler       4.23s ± 7%      4.17s ± 7%    ~           (p=0.057 n=29+27)

name       old user-ns/op  new user-ns/op  delta
Template        389M ±15%       400M ±12%    ~           (p=0.202 n=30+29)
Unicode         246M ±21%       232M ±22%  -5.76%        (p=0.006 n=28+29)
GoTypes        1.34G ± 8%      1.34G ± 7%    ~           (p=0.775 n=28+30)
Compiler       5.91G ± 6%      5.87G ± 7%    ~           (p=0.298 n=28+29)

name       old alloc/op    new alloc/op    delta
Template      41.2MB ± 0%     41.2MB ± 0%    ~           (p=0.085 n=30+30)
Unicode       34.0MB ± 0%     31.5MB ± 0%  -7.28%        (p=0.000 n=30+29)
GoTypes        121MB ± 0%      121MB ± 0%    ~           (p=0.657 n=30+30)
Compiler       511MB ± 0%      511MB ± 0%  -0.01%        (p=0.001 n=29+29)

name       old allocs/op   new allocs/op   delta
Template        390k ± 0%       390k ± 0%    ~           (p=0.225 n=30+29)
Unicode         318k ± 0%       293k ± 0%  -8.03%        (p=0.000 n=30+29)
GoTypes        1.16M ± 0%      1.16M ± 0%    ~           (p=0.745 n=30+30)
Compiler       4.35M ± 0%      4.35M ± 0%    ~           (p=0.105 n=30+30)

Change-Id: I6310739a0bfdb54f1ab8a460b2c03615ad1ff5bc
Reviewed-on: https://go-review.googlesource.com/32221
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Matthew Dempsky 2016-10-27 02:02:30 -07:00
parent 4951c79363
commit bba1ac4fd9
4 changed files with 71 additions and 60 deletions
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19
src/cmd/compile/internal/gc/esc.go
View file

@ -899,16 +899,22 @@ func (e *EscState) esc(n *Node, parent *Node) {
case OARRAYLIT:
// Link values to array
for _, n5 := range n.List.Slice() {
e.escassign(n, n5.Right, e.stepAssignWhere(n, n5.Right, "array literal element", n))
for _, n2 := range n.List.Slice() {
if n2.Op == OKEY {
n2 = n2.Right
}
e.escassign(n, n2, e.stepAssignWhere(n, n2, "array literal element", n))
}
case OSLICELIT:
// Slice is not leaked until proven otherwise
e.track(n)
// Link values to slice
for _, n5 := range n.List.Slice() {
e.escassign(n, n5.Right, e.stepAssignWhere(n, n5.Right, "slice literal element", n))
for _, n2 := range n.List.Slice() {
if n2.Op == OKEY {
n2 = n2.Right
}
e.escassign(n, n2, e.stepAssignWhere(n, n2, "slice literal element", n))
}
// Link values to struct.
@ -1928,7 +1934,10 @@ func (e *EscState) escwalkBody(level Level, dst *Node, src *Node, step *EscStep,
case OSLICELIT:
for _, n1 := range src.List.Slice() {
e.escwalk(level.dec(), dst, n1.Right, e.stepWalk(dst, n1.Right, "slice-literal-element", step))
if n1.Op == OKEY {
n1 = n1.Right
}
e.escwalk(level.dec(), dst, n1, e.stepWalk(dst, n1, "slice-literal-element", step))
}
fallthrough