217b3ac093
As reported by Vishal, CompareGuid() is a hotspot, and switching from BaseMemoryLibStm in ArmPkg/ to BaseMemoryLibOptDxe causes a noticeable performance regression due to the fact that BaseMemoryLibOptDxe uses unaligned accessors explicitly to implement CompareGuid() and the related functions. Since BaseMemoryLibOptDxe on ARM and AARCH64 can only be used in contexts where unaligned accesses are allowed, reimplement these functions for ARM and AARCH64 specifically, using wide accessors that can tolerate any misalignment. Reported-by: "Oliyil Kunnil, Vishal" <vishalo@qti.qualcomm.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Liming Gao <liming.gao@intel.com>
41 lines
1.8 KiB
ArmAsm
41 lines
1.8 KiB
ArmAsm
//
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// Copyright (c) 2016, Linaro Limited
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the Linaro nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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.text
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.align 5
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ASM_GLOBAL ASM_PFX(InternalMemCompareGuid)
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ASM_PFX(InternalMemCompareGuid):
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mov x2, xzr
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ldp x3, x4, [x0]
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cbz x1, 0f
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ldp x1, x2, [x1]
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0: cmp x1, x3
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ccmp x2, x4, #0, eq
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cset w0, eq
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ret
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