derek.holloway
7502bf64a4
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36 lines
856 B
ArmAsm
36 lines
856 B
ArmAsm
//===------- bswapsi2 - Implement bswapsi2 --------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "../assembly.h"
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.syntax unified
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.text
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DEFINE_CODE_STATE
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//
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// extern uint32_t __bswapsi2(uint32_t);
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//
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// Reverse all the bytes in a 32-bit integer.
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//
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.p2align 2
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DEFINE_COMPILERRT_FUNCTION(__bswapsi2)
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#if __ARM_ARCH < 6
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// before armv6 does not have "rev" instruction
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eor r1, r0, r0, ror #16
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bic r1, r1, #0xff0000
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mov r1, r1, lsr #8
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eor r0, r1, r0, ror #8
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#else
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rev r0, r0
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#endif
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JMP(lr)
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END_COMPILERRT_FUNCTION(__bswapsi2)
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NO_EXEC_STACK_DIRECTIVE
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