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60 lines
2.2 KiB
60 lines
2.2 KiB
5 months ago
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# Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License, version 2.0,
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# as published by the Free Software Foundation.
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#
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# This program is also distributed with certain software (including
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# but not limited to OpenSSL) that is licensed under separate terms,
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# as designated in a particular file or component or in included license
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# documentation. The authors of MySQL hereby grant you an additional
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# permission to link the program and your derivative works with the
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# separately licensed software that they have included with MySQL.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License, version 2.0, for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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INCLUDE(CheckCSourceRuns)
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INCLUDE(CheckCXXSourceRuns)
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INCLUDE(CMakePushCheckState)
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SET(code "
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int main (int argc, char **argv)
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{
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double n[21] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 1, 1, 1, 1, 1, 1, 1,1 };
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double m= 0, s= 0;
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int i;
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for(i= 0; i < 21; i++)
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{
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double m_kminusone= m;
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m= m_kminusone + (n[i] - m_kminusone) / (double) (i + 2);
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s= s + (n[i] - m_kminusone) * (n[i] - m);
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}
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/*
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s should now be either 5e 74 d1 45 17 5d 14 40 or
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40 14 5d 17 45 d1 74 5e, depending on endianness. If the floating point
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operations are optimized with fused multiply-add instructions, the least
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significant byte is 5d instead of 5e.
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*/
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return (*(unsigned char*)(&s) == 0x5e ||
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*((unsigned char*)(&s) + 7) == 0x5e);
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}"
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)
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CMAKE_PUSH_CHECK_STATE()
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STRING_APPEND(CMAKE_REQUIRED_FLAGS " -O3")
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IF(MY_COMPILER_IS_GNU)
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CHECK_C_SOURCE_RUNS("${code}" HAVE_C_FLOATING_POINT_FUSED_MADD)
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CHECK_CXX_SOURCE_RUNS("${code}" HAVE_CXX_FLOATING_POINT_FUSED_MADD)
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ENDIF()
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CMAKE_POP_CHECK_STATE()
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