cmd/internal/gc: emit write barriers at lower level
This is primarily preparation for inlining, not an optimization by itself,
but it still helps some.
name old new delta
BenchmarkBinaryTree17 18.2s × (0.99,1.01) 17.9s × (0.99,1.01) -1.57%
BenchmarkFannkuch11 4.44s × (1.00,1.00) 4.42s × (1.00,1.00) -0.40%
BenchmarkFmtFprintfEmpty 119ns × (0.95,1.02) 118ns × (0.96,1.02) ~
BenchmarkFmtFprintfString 501ns × (0.99,1.02) 486ns × (0.99,1.01) -2.89%
BenchmarkFmtFprintfInt 474ns × (0.99,1.00) 457ns × (0.99,1.01) -3.59%
BenchmarkFmtFprintfIntInt 792ns × (1.00,1.00) 768ns × (1.00,1.01) -3.03%
BenchmarkFmtFprintfPrefixedInt 574ns × (1.00,1.01) 584ns × (0.99,1.03) +1.83%
BenchmarkFmtFprintfFloat 749ns × (1.00,1.00) 739ns × (0.99,1.00) -1.34%
BenchmarkFmtManyArgs 2.94µs × (1.00,1.01) 2.77µs × (1.00,1.00) -5.76%
BenchmarkGobDecode 39.5ms × (0.99,1.01) 39.3ms × (0.99,1.01) ~
BenchmarkGobEncode 39.4ms × (1.00,1.01) 39.4ms × (0.99,1.00) ~
BenchmarkGzip 658ms × (1.00,1.01) 661ms × (0.99,1.01) ~
BenchmarkGunzip 142ms × (1.00,1.00) 142ms × (1.00,1.00) +0.22%
BenchmarkHTTPClientServer 134µs × (0.99,1.01) 133µs × (0.98,1.01) ~
BenchmarkJSONEncode 57.1ms × (0.99,1.01) 56.5ms × (0.99,1.01) ~
BenchmarkJSONDecode 141ms × (1.00,1.00) 143ms × (1.00,1.00) +1.09%
BenchmarkMandelbrot200 6.01ms × (1.00,1.00) 6.01ms × (1.00,1.00) ~
BenchmarkGoParse 10.1ms × (0.91,1.09) 9.6ms × (0.94,1.07) ~
BenchmarkRegexpMatchEasy0_32 207ns × (1.00,1.01) 210ns × (1.00,1.00) +1.45%
BenchmarkRegexpMatchEasy0_1K 592ns × (0.99,1.00) 596ns × (0.99,1.01) +0.68%
BenchmarkRegexpMatchEasy1_32 184ns × (0.99,1.01) 184ns × (0.99,1.01) ~
BenchmarkRegexpMatchEasy1_1K 1.01µs × (1.00,1.00) 1.01µs × (0.99,1.01) ~
BenchmarkRegexpMatchMedium_32 327ns × (0.99,1.00) 327ns × (1.00,1.01) ~
BenchmarkRegexpMatchMedium_1K 92.5µs × (1.00,1.00) 93.0µs × (1.00,1.02) +0.48%
BenchmarkRegexpMatchHard_32 4.79µs × (0.95,1.00) 4.76µs × (0.95,1.01) ~
BenchmarkRegexpMatchHard_1K 136µs × (1.00,1.00) 136µs × (1.00,1.01) ~
BenchmarkRevcomp 900ms × (0.99,1.01) 892ms × (1.00,1.01) ~
BenchmarkTemplate 170ms × (0.99,1.01) 175ms × (0.99,1.00) +2.95%
BenchmarkTimeParse 645ns × (1.00,1.00) 638ns × (1.00,1.00) -1.16%
BenchmarkTimeFormat 740ns × (1.00,1.00) 772ns × (1.00,1.00) +4.39%
Change-Id: I0be905e32791e0cb70ff01f169c4b309a971d981
Reviewed-on: https://go-review.googlesource.com/9159
Reviewed-by: Rick Hudson <rlh@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/src/cmd/internal/gc/init.go b/src/cmd/internal/gc/init.go
index b3a6a00..b5d1e50 100644
--- a/src/cmd/internal/gc/init.go
+++ b/src/cmd/internal/gc/init.go
@@ -57,7 +57,7 @@
case ODCLFUNC, ODCLCONST, ODCLTYPE, OEMPTY:
break
- case OAS:
+ case OAS, OASWB:
if isblank(l.N.Left) && candiscard(l.N.Right) {
break
}
