rtlhooks.c File Reference

Functions
rtx	gen_lowpart_general ()
rtx	reg_num_sign_bit_copies_general (const_rtx x, enum machine_mode mode, const_rtx known_x, enum machine_mode known_mode, unsigned int known_ret, unsigned int *result)
rtx	reg_nonzero_bits_general (const_rtx x, enum machine_mode mode, const_rtx known_x, enum machine_mode known_mode, unsigned HOST_WIDE_INT known_ret, unsigned HOST_WIDE_INT *nonzero)
bool	reg_truncated_to_mode_general (enum machine_mode mode, const_rtx x)
rtx	gen_lowpart_if_possible ()

Variables
struct rtl_hooks	general_rtl_hooks = RTL_HOOKS_INITIALIZER
struct rtl_hooks	rtl_hooks = RTL_HOOKS_INITIALIZER

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Function Documentation

rtx gen_lowpart_general

(

)

     Handle SUBREGs and hard REGs that were rejected by
     simplify_gen_subreg.  

         The only additional case we can do is MEM.  

         The following exposes the use of "x" to CSE.  

           Adjust the address so that the address-after-the-data
           is unchanged.  

rtx gen_lowpart_if_possible

(

)

   Assuming that X is an rtx (e.g., MEM, REG or SUBREG) for a fixed-point
   number, return an rtx (MEM, SUBREG, or CONST_INT) that refers to the
   least-significant part of X.
   MODE specifies how big a part of X to return.

   If the requested operation cannot be done, 0 is returned.

   This is similar to gen_lowpart_general.  

         This is the only other case we handle.  

           Adjust the address so that the address-after-the-data is
           unchanged.  

References memory_address_addr_space_p().

rtx reg_nonzero_bits_general	(	const_rtx	x,
		enum machine_mode	mode,
		const_rtx	known_x,
		enum machine_mode	known_mode,
		unsigned HOST_WIDE_INT	known_ret,
		unsigned HOST_WIDE_INT *	nonzero
	)

rtx reg_num_sign_bit_copies_general	(	const_rtx	x,
		enum machine_mode	mode,
		const_rtx	known_x,
		enum machine_mode	known_mode,
		unsigned int	known_ret,
		unsigned int *	result
	)

bool reg_truncated_to_mode_general	(	enum machine_mode	mode,
		const_rtx	x
	)

References gen_lowpart_common().

---

Variable Documentation

struct rtl_hooks general_rtl_hooks = RTL_HOOKS_INITIALIZER

@verbatim 

Generic hooks for the RTL middle-end. Copyright (C) 2004-2013 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see http://www.gnu.org/licenses/.

   For speed, we will copy the RTX hooks struct member-by-member
   instead of doing indirect calls.  For these reason, we initialize
   *two* struct rtl_hooks globals: rtl_hooks is the one that is used
   to actually call the hooks, while general_rtl_hooks is used
   to restore the hooks by passes that modify them.  

struct rtl_hooks rtl_hooks = RTL_HOOKS_INITIALIZER

   Each pass can provide its own.