cmd/compile: mark static slice backing arrays as noalg

file      before    after     Δ       %
addr2line 4413296   4404160   -9136   -0.207%
api       5982648   5978232   -4416   -0.074%
asm       5075640   5057656   -17984  -0.354%
buildid   2886200   2881304   -4896   -0.170%
cgo       4854168   4844936   -9232   -0.190%
compile   19694784  19680752  -14032  -0.071%
cover     5278008   5269256   -8752   -0.166%
dist      3699528   3690984   -8544   -0.231%
doc       4694824   4690408   -4416   -0.094%
fix       3411336   3411048   -288    -0.008%
link      6721496   6703320   -18176  -0.270%
nm        4371152   4357904   -13248  -0.303%
objdump   4760960   4747680   -13280  -0.279%
pack      2340824   2336520   -4304   -0.184%
pprof     14810820  14801188  -9632   -0.065%
test2json 2861896   2857528   -4368   -0.153%
trace     11681076  11676228  -4848   -0.042%
vet       8285464   8276184   -9280   -0.112%
total     115824120 115665288 -158832 -0.137%

Change-Id: I66e1985c3a81cd9b2aa72cb4b4a8aa1781e473b9
Reviewed-on: https://go-review.googlesource.com/c/go/+/228222
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>

diff --git a/src/cmd/compile/internal/gc/sinit.go b/src/cmd/compile/internal/gc/sinit.go
index 3a40d15acd2b4ac89d0fb7f870944bd5e90d4462..393211c2dd6fffaf2557783e344ffb048a367155 100644 (file)
--- a/src/cmd/compile/internal/gc/sinit.go
+++ b/src/cmd/compile/internal/gc/sinit.go
@@ -217,6 +217,7 @@ func (s *InitSchedule) staticassign(l *Node, r *Node) bool {
                // Init slice.
                bound := r.Right.Int64()
                ta := types.NewArray(r.Type.Elem(), bound)
+               ta.SetNoalg(true)
                a := staticname(ta)
                s.inittemps[r] = a
                slicesym(l, a, bound)