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https://github.com/golang/go
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d99cee79b9
Add more ARM64 optimizations: - use hardware zero register when it is possible. - use shifted ops. The assembler supports shifted ops but not documented, nor knows how to print it. This CL adds them. - enable fast division. This was disabled because it makes the old backend generate slower code. But with SSA it generates faster code. Turn on SSA by default, also adjust tests. Change-Id: I7794479954c83bb65008dcb457bc1e21d7496da6 Reviewed-on: https://go-review.googlesource.com/26950 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
61 lines
3.1 KiB
Go
61 lines
3.1 KiB
Go
// +build !amd64,!arm,!amd64p32,!386,!arm64
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// errorcheck -0 -d=append,slice
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Check optimization results for append and slicing.
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package main
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func a1(x []int, y int) []int {
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x = append(x, y) // ERROR "append: len-only update"
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return x
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}
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func a2(x []int, y int) []int {
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return append(x, y) // ERROR "append: full update"
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}
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func a3(x *[]int, y int) {
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*x = append(*x, y) // ERROR "append: len-only update"
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}
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func s1(x **[]int, xs **string, i, j int) {
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var z []int
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z = (**x)[2:] // ERROR "slice: omit check for 2nd index"
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z = (**x)[2:len(**x)] // not yet: "slice: reuse len" "slice: omit check for 2nd index"
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z = (**x)[2:cap(**x)] // not yet: "slice: reuse cap" "slice: omit check for 2nd index"
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z = (**x)[i:i] // ERROR "slice: reuse 1st index" "slice: omit check for 1st index" "slice: result len == 0"
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z = (**x)[1:i:i] // ERROR "slice: reuse 2nd index" "slice: omit check for 2nd index" "slice: result cap == result len"
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z = (**x)[i:j:0] // ERROR "slice: omit check for 3rd index"
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z = (**x)[i:0:j] // ERROR "slice: omit check for 2nd index"
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z = (**x)[0:i:j] // ERROR "slice: omit check for 1st index" "slice: skip base adjustment for 1st index 0"
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z = (**x)[0:] // ERROR "slice: omit slice operation"
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z = (**x)[2:8] // ERROR "slice: omit check for 1st index" "slice: result len == 6"
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z = (**x)[2:2] // ERROR "slice: omit check for 1st index" "slice: result len == 0"
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z = (**x)[0:i] // ERROR "slice: omit check for 1st index" "slice: skip base adjustment for 1st index 0"
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z = (**x)[2:i:8] // ERROR "slice: result cap == 6"
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z = (**x)[i:2:i] // ERROR "slice: reuse 1st index" "slice: result cap == 0" "slice: skip base adjustment for cap == 0"
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z = z[0:i] // ERROR "slice: omit check for 1st index" "slice: result cap not computed" "slice: skip base adjustment for 1st index 0" "slice: len-only update"
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z = z[0:i : i+1] // ERROR "slice: omit check for 1st index" "slice: skip base adjustment for 1st index 0" "slice: len/cap-only update"
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z = z[i : i+1]
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println(z)
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var zs string
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zs = (**xs)[2:] // ERROR "slice: omit check for 2nd index"
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zs = (**xs)[2:len(**xs)] // not yet: "slice: reuse len" "slice: omit check for 2nd index"
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zs = (**xs)[i:i] // ERROR "slice: reuse 1st index" "slice: omit check for 1st index" "slice: result len == 0" "slice: skip base adjustment for string len == 0"
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zs = (**xs)[0:] // ERROR "slice: omit slice operation"
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zs = (**xs)[2:8] // ERROR "slice: omit check for 1st index" "slice: result len == 6"
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zs = (**xs)[2:2] // ERROR "slice: omit check for 1st index" "slice: result len == 0" "slice: skip base adjustment for string len == 0"
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zs = (**xs)[0:i] // ERROR "slice: omit check for 1st index" "slice: skip base adjustment for 1st index 0"
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zs = zs[0:i] // ERROR "slice: omit check for 1st index" "slice: skip base adjustment for 1st index 0" "slice: len-only update"
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zs = zs[i : i+1]
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println(zs)
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}
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