mirror of
https://github.com/golang/go
synced 2024-11-26 21:21:34 -07:00
5ac2476748
Previously, pattern matching was good enough to achieve good performance for the RotateLeft* functions, but the inlining cost for them was much too high. Make RotateLeft* intrinsic on amd64 as a stop-gap for now to reduce inlining costs. This should be done (or at least looked at) for other architectures as well. Updates golang/go#17566 Change-Id: I6a106ff00b6c4e3f490650af3e083ed2be00c819 Reviewed-on: https://go-review.googlesource.com/132435 Run-TryBot: Andrew Bonventre <andybons@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
29 lines
569 B
Go
29 lines
569 B
Go
// +build amd64
|
|
// errorcheck -0 -m
|
|
|
|
// Copyright 2018 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Test that inlining of math/bits.RotateLeft* treats those calls as intrinsics.
|
|
|
|
package p
|
|
|
|
import "math/bits"
|
|
|
|
var (
|
|
x8 uint8
|
|
x16 uint16
|
|
x32 uint32
|
|
x64 uint64
|
|
x uint
|
|
)
|
|
|
|
func f() { // ERROR "can inline f"
|
|
x8 = bits.RotateLeft8(x8, 1)
|
|
x16 = bits.RotateLeft16(x16, 1)
|
|
x32 = bits.RotateLeft32(x32, 1)
|
|
x64 = bits.RotateLeft64(x64, 1)
|
|
x = bits.RotateLeft(x, 1)
|
|
}
|