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cmd/link: allocate small []byte reads together

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Reduces number of memory allocations by 12%:

Before: 1816664
After:  1581591

Small speed improvement.

Change-Id: I61281fb852e8e31851a350e3ae756676705024a4
Reviewed-on: https://go-review.googlesource.com/20027
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
David Crawshaw 2016-02-28 17:58:57 -09:00
parent f4717a902e
commit 36f25a7e7b
1 changed files with 16 additions and 2 deletions
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18
src/cmd/link/internal/ld/objfile.go
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@ -431,9 +431,23 @@ func rdstring(f *obj.Biobuf) string {
return string(p)
}
var (
rddataBuf = make([]byte, rddataBufMax)
rddataBufMax = 1 << 14
)
func rddata(f *obj.Biobuf) []byte {
n := rdint64(f)
p := make([]byte, n)
var p []byte
n := rdint(f)
if n > rddataBufMax {
p = make([]byte, n)
} else {
if len(rddataBuf) < n {
rddataBuf = make([]byte, rddataBufMax)
}
p = rddataBuf[:n:n]
rddataBuf = rddataBuf[n:]
}
obj.Bread(f, p)
return p
}