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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
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// errorcheck -0 -m
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// Copyright 2018 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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// Test that inlining of math/bits.RotateLeft* treats those calls as intrinsics.
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package p
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import "math/bits"
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var (
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x8 uint8
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x16 uint16
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x32 uint32
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x64 uint64
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x uint
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)
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func f() { // ERROR "can inline f"
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x8 = bits.RotateLeft8(x8, 1)
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x16 = bits.RotateLeft16(x16, 1)
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x32 = bits.RotateLeft32(x32, 1)
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x64 = bits.RotateLeft64(x64, 1)
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x = bits.RotateLeft(x, 1)
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}
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