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check for builtin_expect and define GCC_UNLIKELY

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2188
This commit is contained in:
Peter Veenstra 2005-04-21 21:03:19 +00:00
parent 6157cbaebf
commit 4a2808a9a6
3 changed files with 18 additions and 0 deletions
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6
acinclude.m4
View file

@ -331,6 +331,12 @@ AH_BOTTOM([#if C_HAS_ATTRIBUTE
#define GCC_ATTRIBUTE(x) /* attribute not supported */
#endif])
AH_BOTTOM([#if C_HAS_BUILTIN_EXPECT
#define GCC_UNLIKELY(x) __builtin_expect((x),0)
#else
#define GCC_UNLIKELY(x) (x)
#endif])
AH_BOTTOM([
typedef double Real64;

11
configure.in
View file

@ -58,6 +58,17 @@ AC_MSG_CHECKING(if compiler allows __attribute__)
AC_TRY_COMPILE([], [typedef struct { } __attribute__ ((packed)) junk;],
[ AC_MSG_RESULT(yes);AC_DEFINE(C_HAS_ATTRIBUTE)],AC_MSG_RESULT(no))
#Check if the compiler supports __builtin_expect
AH_TEMPLATE([C_HAS_BUILTIN_EXPECT],[Determines if the compilers supports __builtin_expect for branch prediction.])
AC_MSG_CHECKING(if compiler allows __builtin_expect)
AC_TRY_COMPILE([],[
int main(int argc,char* argv[]){
int x=10;if( __builtin_expect ((x==1),0) ) ;
return 0;
}
], [ AC_MSG_RESULT(yes);AC_DEFINE(C_HAS_BUILTIN_EXPECT)],AC_MSG_RESULT(no))
AM_PATH_ALSA(0.9.0, AC_DEFINE(HAVE_ALSA,1,[Define to 1 to use ALSA for MIDI]) , : )
#Check for big endian machine, should #define WORD_BIGENDIAN if so

1
src/platform/visualc/config.h
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@ -52,6 +52,7 @@
#define C_DIRECTSERIAL 1
#define GCC_ATTRIBUTE(x) /* attribute not supported */
#define GCC_UNLIKELY(x) (x)
typedef double Real64;
/* The internal types */