contrib/gcc/combine.c

190      last_set_invalid		set to nonzero when it is not valid
201      reg_stat[i].last_set_value is valid if it is nonzero, and either
236   /* Set nonzero if references to register n in expressions should not be
237      used.  last_set_invalid is set nonzero when this register is being
249      nonzero bits of a register, specifically which bits are known to be
363    other_insn is nonzero if we have modified some other insn in the process
706    Return nonzero if the combiner has turned an indirect jump
1478    If I1_NOT_IN_SRC is nonzero, it means that finding I1 in the source
1484    If PI3_DEST_KILLED is nonzero, it is a pointer to a location in which
1610 /* Determine whether INSN can be used in a combination.  Return nonzero if
1685 /* Return nonzero iff part of the return value is live during INSN, and
1761    ADDED_SETS is nonzero if the original set is still required.  */
1817    Set NEW_DIRECT_JUMP_P to a nonzero value if try_combine creates a
3674 	     need to know if it is zero or nonzero, replace it with a bit
3899    IN_DEST is nonzero if we are processing the SET_DEST of a SET.
3901    UNIQUE_COPY is nonzero if each substitution must be unique.  We do this
3902    by copying if `n_occurrences' is nonzero.  */
4172    OP0_MODE is the original mode of XEXP (x, 0).  IN_DEST is nonzero
4450       /* If X has only a single bit that might be nonzero, say, bit I, convert
4566       /* If only the low-order bit of X is possibly nonzero, (plus x -1)
4674 	     if only the low-order bit is possibly nonzero in X (such as when
4776 	     one bit that might be nonzero, we can convert (ne x 0) to
4906 	 only a single bit that might be nonzero, that is its value when it is
5320 	     vice versa, OP0 has only one bit that might be nonzero, and OP1
5474      practice, at most two will be nonzero.  Then we do the IOR's.  */
5959 /* Return an RTX for a reference to LEN bits of INNER.  If POS_RTX is nonzero,
5963    UNSIGNEDP is nonzero for an unsigned reference and zero for a
5966    IN_DEST is nonzero if this is a reference in the destination of a
5967    SET.  This is used when a ZERO_ or SIGN_EXTRACT isn't needed.  If nonzero,
5971    IN_COMPARE is nonzero if we are in a COMPARE.  This means that a
6464      nonzero, it will be returned.  */
6848    MODE and will only refer to those bits that are nonzero in MASK.
6856    If JUST_SELECT is nonzero, don't optimize by noticing that bits in MASK
6867   unsigned HOST_WIDE_INT fuller_mask, nonzero;
6906   nonzero = nonzero_bits (x, mode);
6909   if (!just_select && (nonzero & mask) == 0 && !side_effects_p (x))
7226 	      nonzero = ~(HOST_WIDE_INT) 0;
7230 		 We need only shift if these are fewer than nonzero can
7231 		 hold.  If not, we must keep all bits set in nonzero.  */
7235 		nonzero >>= INTVAL (XEXP (x, 1))
7241 	      nonzero = GET_MODE_MASK (GET_MODE (x));
7242 	      nonzero >>= INTVAL (XEXP (x, 1));
7245 	  if ((mask & ~nonzero) == 0)
7355 	 in STORE_FLAG_VALUE and FOO has a single bit that might be nonzero,
7389 /* Return nonzero if X is an expression that has one of two values depending on
7390    whether some other value is zero or nonzero.  In that case, we return the
7392    returned has a nonzero value, and *PFALSE is set to the other alternative.
7465 	 operands is zero when the other is nonzero, and vice-versa,
8165   unsigned HOST_WIDE_INT nonzero;
8193   /* See what bits may be nonzero in VAROP.  Unlike the general case of
8197   nonzero = nonzero_bits (varop, mode) & GET_MODE_MASK (mode);
8203   constop &= nonzero;
8259   if (constop == nonzero)
8293 /* Given a REG, X, compute which bits in X can be nonzero.
8304 			      unsigned HOST_WIDE_INT *nonzero)
8308   /* If X is a register whose nonzero bits value is current, use it.
8310      value.  Otherwise, use the previously-computed global nonzero bits
8325       *nonzero &= reg_stat[REGNO (x)].last_set_nonzero_bits;
8362       *nonzero &= mask;
8908 		 nonzero bits of the inner shift the same way the
9048 	     that may be nonzero.  */
9108 	     that might be nonzero in BAR are those being shifted out and those
9646 	 and the operand's possibly nonzero bits are 0xffffff01; in that case
9758 	 being compared can only have that single bit nonzero (e.g., it was
9976 	      /* Result is nonzero iff shift count is equal to I.  */
10315 	  /* The sign bit of (ior (plus X (const_int -1)) X) is nonzero
10721 	  /* If the only nonzero bits in OP0 and OP1 are those in the
10994      nonzero bits, and the number of sign bit copies.  */
11116    adjust nonzero and sign bit information of the registers that are
11263    If REPLACE is nonzero, replace the invalid reference with
11429 /* Return nonzero if expression X refers to a REG or to memory
11507 /* Return nonzero if REG is known to be dead at INSN.
12189 	     Similarly for I2, if it is nonzero and adjacent to I3.