contrib/gcc/expr.c

191    called to "memset" storage with byte values other than zero, or
348    This causes zero-extension instead of sign-extension.  */
768      make the high-order word of the constant zero, not all ones.  */
781 	  /* We need to zero extend VAL.  */
808 	 X does not need sign- or zero-extension.   This may not be
816 	  /* We must sign or zero-extend in this case.  Start by
817 	     zero-extending, then sign extend if we need to.  */
1983       /* Otherwise, simply initialize the result to zero.  */
2517      just move a zero.  Otherwise, do this a piece at a time.  */
2522       rtx zero = CONST0_RTX (mode);
2523       if (zero != NULL)
2525 	  emit_move_insn (object, zero);
2531 	  zero = CONST0_RTX (GET_MODE_INNER (mode));
2532 	  if (zero != NULL)
2534 	      write_complex_part (object, zero, 0);
2535 	      write_complex_part (object, zero, 1);
3578    If REG is zero but PARTIAL is not, take any all others actions for an
4137 	      /* If the field is at offset zero, we could have been given the
4173      since it might be a promoted variable where the zero- or sign- extension
4895    CLEARED is true if TARGET is known to have been zero'd.
4917 	/* If size is zero or the target is already cleared, do nothing.  */
4931 	   set the initial value as zero so we can fold the value into
5140 	       elements, or if the incidence of zero elements is >=
5390 	       or if the incidence of zero elements is >= 75%.  */
5902   /* Otherwise, return a zero of the appropriate type.  */
6138    It is always safe for this routine to return zero since it merely
6357 	 HOST_BITS_PER_WIDE_INT bits are zero, return BIGGEST_ALIGNMENT.
7152 	 if all of the initializer is zero.
7369 		    /* Optimize the special-case of a zero lower bound.
8029 	 zero-extend.  */
8070 	 zero-extend.  */
8181 		  be zero-extended or both be sign-extended.  */
8445 	 as actual zero-or-1 values and then bitwise anding.  In cases where
8568 	 only with operands that are always zero or one.  */
8935 /* Return the tree node if an ARG corresponds to a string constant or zero
9049    Return zero if there is no suitable set-flag instruction
9116      converted to comparisons with zero.  Do so here so that the tests
9117      below will be aware that we have a comparison with zero.   These