ca36af215f
When initializing a new object, we're often writing 1) to a location that doesn't have a pointer to a heap object 2) a pointer that doesn't point to a heap object When both those conditions are true, we can avoid the write barrier. This CL detects case 1 by looking for writes to known-zeroed locations. The results of runtime.newobject are zeroed, and we perform a simple tracking of which parts of that object are written so we can determine what part remains zero at each write. This CL detects case 2 by looking for addresses of globals (including the types and itabs which are used in interfaces) and for nil pointers. Makes cmd/go 0.3% smaller. Some particular cases, like the slice literal in #29573, can get much smaller. TODO: we can remove actual zero writes also with this mechanism. Update #29573 Change-Id: Ie74a3533775ea88da0495ba02458391e5db26cb9 Reviewed-on: https://go-review.googlesource.com/c/go/+/156363 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com> |
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The Go Programming Language
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