15 lines
483 B
Text
15 lines
483 B
Text
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AC_DEFUN([AX_C___BUILTIN_EXPECT], [
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AC_MSG_CHECKING(for __builtin_expect)
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AC_CACHE_VAL(ac_cv___builtin_expect, [
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AC_TRY_COMPILE(
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[int foo(void) { if (__builtin_expect(0, 0)) return 1; return 0; }],
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[],
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ac_cv___builtin_expect=yes,
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ac_cv___builtin_expect=no
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)])
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if test "$ac_cv___builtin_expect" = "yes"; then
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AC_DEFINE(HAVE___BUILTIN_EXPECT, 1, [define if your compiler has __builtin_expect])
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fi
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AC_MSG_RESULT($ac_cv___builtin_expect)
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])
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