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runtime: special case allocation of arrays of size 1 

This avoids division and multiplication.
Instrumentation suggests that this is a very common case.

Change-Id: I2d5d5012d4f4df4c4af1f9f85ca9c323c9889c0e
Reviewed-on: https://go-review.googlesource.com/54657
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-07-16 17:46:52 -10:00
parent 733567a186
commit 29e9b89b9a
1 changed files with 3 additions and 0 deletions
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3
src/runtime/malloc.go
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@ -847,6 +847,9 @@ func reflect_unsafe_New(typ *_type) unsafe.Pointer {
// newarray allocates an array of n elements of type typ.
func newarray(typ *_type, n int) unsafe.Pointer {
if n == 1 {
return mallocgc(typ.size, typ, true)
}
if n < 0 || uintptr(n) > maxSliceCap(typ.size) {
panic(plainError("runtime: allocation size out of range"))
}