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7bba6884a0
When using __builtin_ctzll() in AArch32 code, the compiler may translate that into a call to the __ctzdi2() function. In this case, the linking phase fails because TF doesn't provide an implementation for it. This patch imports the implementation of the __ctzdi2() function from LLVM's compiler-rt project and hooks it into TF's build system. The ctzdi2.c file is an unmodified copy from the master branch as of July 19 2017 (SVN revision: 308480). Change-Id: I96766a025ba28e1afc6ef6a5c4ef91d85fc8f32b Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
29 lines
836 B
C
29 lines
836 B
C
/* ===-- ctzdi2.c - Implement __ctzdi2 -------------------------------------===
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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 __ctzdi2 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: the number of trailing 0-bits */
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/* Precondition: a != 0 */
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COMPILER_RT_ABI si_int
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__ctzdi2(di_int a)
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{
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dwords x;
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x.all = a;
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const si_int f = -(x.s.low == 0);
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return __builtin_ctz((x.s.high & f) | (x.s.low & ~f)) +
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(f & ((si_int)(sizeof(si_int) * CHAR_BIT)));
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}
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