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638d2b5141
Imported from the LLVM compiler_rt library on master branch as of 30 Oct 2018 (SVN revision: r345645). This is to get the __aeabi_llsr() builtin, which is required by a subsequent patch that uses a logical right shift operator in AArch32. Change-Id: I9884139a12855a8a87206fb572aaa7dd35582b09 Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* ===-- lshrdi3.c - Implement __lshrdi3 -----------------------------------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is dual licensed under the MIT and the University of Illinois Open
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* Source Licenses. See LICENSE.TXT for details.
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*
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* ===----------------------------------------------------------------------===
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*
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* This file implements __lshrdi3 for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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#include "int_lib.h"
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/* Returns: logical a >> b */
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/* Precondition: 0 <= b < bits_in_dword */
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COMPILER_RT_ABI di_int
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__lshrdi3(di_int a, si_int b)
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{
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const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT);
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udwords input;
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udwords result;
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input.all = a;
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if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */
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{
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result.s.high = 0;
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result.s.low = input.s.high >> (b - bits_in_word);
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}
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else /* 0 <= b < bits_in_word */
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{
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if (b == 0)
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return a;
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result.s.high = input.s.high >> b;
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result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b);
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}
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return result.all;
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}
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#if defined(__ARM_EABI__)
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AEABI_RTABI di_int __aeabi_llsr(di_int a, si_int b) COMPILER_RT_ALIAS(__lshrdi3);
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#endif
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