tree 97f17bb5205184633e5dc765db35f5de9090d50d
parent 82253ddc7a6b85240fd74cc5138f685ca931f355
author Cuong Manh Le <cuong.manhle.vn@gmail.com> 1585693669 +0700
committer Matthew Dempsky <mdempsky@google.com> 1585697952 +0000

cmd/compile: optimize len check when make slice

In CL 226278, we did:

	if len < 0 { panicmakeslicelen }
	if len > cap { panicmakeslicecap }

But due to the fact that cap is constrained to [0,2^31), so it is safe
to do:

	if uint64(len) > cap {
	    if len < 0 { panicmakeslicelen() }
	    panicmakeslicecap()
	}

save us a comparison in common case when len is within range.

Passes toolstash-check.

Change-Id: I0ebd52914ccde4cbb45f16c9e020b0c8f42e0663
Reviewed-on: https://go-review.googlesource.com/c/go/+/226737
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>