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m4/reorganization/code_checks/shift.m4

 

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dnl Check signed right shift implementation

 

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AC_MSG_CHECKING([whether signed right shift is sign extended])

 

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AC_TRY_RUN([int main(void){int a=-1;int b=a>>1;return(a!=b);}],

 

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    [have_signed_rightshift_extended=yes],

 

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    [have_signed_rightshift_extended=no],

 

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    [have_signed_rightshift_extended=no])

 

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if test $have_signed_rightshift_extended = yes; then

 

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    AC_DEFINE([HAVE_SAR], 1, [Define signed right shift implementation])

 

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fi

 

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AC_MSG_RESULT([$have_signed_rightshift_extended]);

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