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5c86f0da5f
This patch adds implementations of memcpy, memmove, memset and strcmp optimized for size. The changes have been tested in riscv/riscv-gnu-toolchain by riscv-dejagnu with riscv-sim.exp/riscv-sim-nano.exp.
41 lines
919 B
ArmAsm
41 lines
919 B
ArmAsm
/* Copyright (c) 2019 SiFive Inc. All rights reserved.
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This copyrighted material is made available to anyone wishing to use,
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modify, copy, or redistribute it subject to the terms and conditions
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of the FreeBSD License. This program is distributed in the hope that
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it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
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including the implied warranties of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. A copy of this license is available at
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http://www.opensource.org/licenses.
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*/
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#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)
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.text
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.global memmove
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.type memmove, @function
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memmove:
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beqz a2, 2f
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mv t1, a0
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li a3, 1
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bgtu a1, a0, 1f
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li a3, -1
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addi a4, a2 , -1
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add t1, t1, a4
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add a1, a1, a4
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1:
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lb t2, 0(a1)
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sb t2, 0(t1)
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add a2, a2, -1
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add t1, t1, a3
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add a1, a1, a3
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bnez a2, 1b
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2:
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ret
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.size memmove, .-memmove
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#endif
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