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66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
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// Copyright (c) 2006-2018 Maxim Khizhinsky
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef CDSLIB_COMPILER_GCC_IA64_BITOP_H
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#define CDSLIB_COMPILER_GCC_IA64_BITOP_H
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//@cond none
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namespace cds {
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namespace bitop { namespace platform { namespace gcc { namespace ia64 {
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// MSB - return index (1..32) of most significant bit in x. If x == 0 return 0
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# define cds_bitop_msb32_DEFINED
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static inline int msb32( uint32_t nArg )
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{
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if ( !nArg )
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return 0;
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uint64_t x = nArg;
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x |= x >> 1;
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x |= x >> 2;
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x |= x >> 4;
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x |= x >> 8;
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x |= x >> 16;
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uint64_t nRes;
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asm __volatile__( "popcnt %0=%1\n\t" : "=r" (nRes) : "r" (x));
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return (int) nRes;
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}
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// It is not compiled on HP-UX. Why?..
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#if CDS_OS_TYPE != CDS_OS_HPUX
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// MSB - return index (0..31) of most significant bit in nArg.
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// !!! nArg != 0
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# define cds_bitop_msb32nz_DEFINED
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static inline int msb32nz( uint32_t nArg )
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{
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assert( nArg != 0 );
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long double d = nArg;
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long nExp;
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asm __volatile__("getf.exp %0=%1\n\t" : "=r"(nExp) : "f"(d));
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return (int) (nExp - 0xffff);
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}
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// MSB - return index (0..63) of most significant bit in nArg.
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// !!! nArg != 0
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# define cds_bitop_msb64nz_DEFINED
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static inline int msb64nz( uint64_t nArg )
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{
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assert( nArg != 0 );
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long double d = nArg;
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long nExp;
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asm __volatile__("getf.exp %0=%1\n\t" : "=r" (nExp) : "f" (d));
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return (int) (nExp - 0xffff);
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}
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#endif // #if CDS_OS_TYPE != CDS_OS_HPUX
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}} // namespace gcc::ia64
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using namespace gcc::ia64;
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}}} // namespace cds::bitop::platform
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//@endcond
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#endif // #ifndef CDSLIB_COMPILER_GCC_IA64_BITOP_H
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