tree aace70c4ff8aea807ecb65dcda5e91729730ee4b
parent 946aa5ab2e82d045a2a3b2f18ba2c5b00e957c4b
author Cherry Zhang <cherryyz@google.com> 1552109918 -0500
committer Ian Lance Taylor <iant@golang.org> 1552624443 +0000

compiler: eliminate bound checks in append expression

The compiler generates two array index expressions when lowering
an append expression. Currently they generate bound checks.
Bound checks are not necessary in this case, as we know the slice
has, or will grow to, enough length and capacity. Eliminate them.

Change-Id: I6d29cf0b29e0561a2f8fc14f958c29129bf30a0e
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/166817
Reviewed-by: Ian Lance Taylor <iant@golang.org>