33 lines
820 B
C
33 lines
820 B
C
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//===-- clzti2.c - Implement __clzti2 -------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements __clzti2 for the compiler_rt library.
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//
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//===----------------------------------------------------------------------===//
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#if __x86_64
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#include "int_lib.h"
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// Returns: the number of leading 0-bits
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// Precondition: a != 0
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si_int
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__clzti2(ti_int a)
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{
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twords x;
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x.all = a;
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const di_int f = -(x.high == 0);
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return __builtin_clzll((x.high & ~f) | (x.low & f)) +
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((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT)));
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}
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#endif
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