nkeynes@923: # AC_CHECK_FASTCALL([if-ok],[if-notok])
nkeynes@923: # Test if the compiler recognizes __attribute__((regparm(3))) - we don't 
nkeynes@923: # currently check if it actually works correctly, but probably should...
nkeynes@923: # -----------------------
nkeynes@923: AC_DEFUN([AC_CHECK_FASTCALL], [
nkeynes@923: AC_MSG_CHECKING([support for fastcall calling conventions]);
nkeynes@923: AC_RUN_IFELSE([
nkeynes@923:   AC_LANG_SOURCE([[
nkeynes@923: int __attribute__((regparm(3))) foo(int a, int b) { return a+b; }
nkeynes@923: 
nkeynes@923: int main(int argc, char *argv[])
nkeynes@923: {
nkeynes@923:    return foo( 1, 2 ) == 3 ? 0 : 1;
nkeynes@923: }]])], [ 
nkeynes@923:    AC_MSG_RESULT([yes])
nkeynes@923:    $1 ], [ 
nkeynes@923:    AC_MSG_RESULT([no])
nkeynes@923:    $2 ])
nkeynes@923: ])
nkeynes@923: 
nkeynes@927: # AC_CHECK_FRAME_ADDRESS([if-ok],[if-notok])
nkeynes@927: # Test if the compiler will let us modify the return address on the stack
nkeynes@927: # via __builtin_frame_address()
nkeynes@927: # -----------------------
nkeynes@927: AC_DEFUN([AC_CHECK_FRAME_ADDRESS], [
nkeynes@927: AC_MSG_CHECKING([if we have a working __builtin_frame_address()]);
nkeynes@927: AC_RUN_IFELSE([
nkeynes@927:   AC_LANG_SOURCE([[
nkeynes@927: void * __attribute__((noinline)) first_arg( void *x, void *y ) { return x; }
nkeynes@927: int __attribute__((noinline)) foo( int arg, void *exc )
nkeynes@927: {
nkeynes@927:     if( arg < 2 ) {
nkeynes@927:         *(((void **)__builtin_frame_address(0))+1) = exc;
nkeynes@927:     }
nkeynes@927:     return 0;
nkeynes@927: }
nkeynes@927: 
nkeynes@927: int main(int argc, char *argv[])
nkeynes@927: {
nkeynes@927:    goto *first_arg(&&start, &&except);
nkeynes@927:    
nkeynes@927: start:
nkeynes@927:    return foo( argc, &&except ) + 1;
nkeynes@927: 
nkeynes@927: except:
nkeynes@927:    return 0;
nkeynes@927: }]])], [ 
nkeynes@927:    AC_MSG_RESULT([yes])
nkeynes@927:    $1 ], [ 
nkeynes@927:    AC_MSG_RESULT([no])
nkeynes@927:    $2 ])
nkeynes@927: ])
nkeynes@927: 
nkeynes@927: